hydrology of the chase creek watersheda100.gov.bc.ca/appsdata/acat/documents/r3745/chasefinal...the...

Riverside Forest Products Limited

HYDROLOGYof the

CHASE CREEK WATERSHED

(FIA Activity 2029021)Prepared for

By

March 31, 2005

TABLE OF CONTENTS

1.0 INTRODUCTION .................................................................................................... 1

2.0 BACKGROUND ...................................................................................................... 1

3.0 REVIEW OF EXISTING INFORMATION ............................................................ 3

3.1 PREVIOUS REPORTS .............................................................................................. 33.2 HYDROMETRIC DATA SOURCES............................................................................ 5

4.0 ANALYSIS............................................................................................................... 7

4.1 DISCHARGE DATA ................................................................................................ 74.2 TIMMING OF PEAK FLOW...................................................................................... 84.3 MAGNITUDE OF PEAK FLOW................................................................................. 94.4 DURATION OF RUN-OFF HYDROGRAPH............................................................... 104.5 MINIMUM FLOWS ............................................................................................... 114.6 MEAN DAILY DISCHARGE BY MONTH................................................................ 124.7 ANALYSIS OF WATER LEVELS ............................................................................ 134.8 CLIMATE CHANGE .............................................................................................. 13

5.0 DISCUSSION......................................................................................................... 15

6.0 CONCLUSIONS..................................................................................................... 15

TABLES

TABLE 1Chase Creek – Flood Frequencies.

TABLE 2Chase Creek – Summary of Discharge Data.

TABLE 3Chase Creek – Mean Monthly Discharge.

TABLE 4Chase Creek – Water Levels for Upper Chase/Charcoal versus Discharge for Chase

Creek at the Mouth.

FIGURES

FIGURE 1Location Map of the Chase Creek Watershed.

FIGURE 2Location Map of Hydrometric Stations.

FIGURE 3Mean Daily Discharge by Period

FIGURE 4Year Vs Magnitude of Peak.

FIGURE 5Year Vs Duration of Peak Flow Period.

FIGURE 6Mean Daily Discharge for April

FIGURE 7Mean Daily Discharge for May

FIGURE 8Total Annual Precipitation as a Five-year Moving Average

File:504-003 Project:22080 Date: March 2005

Hydrologyof the

Chase Creek Watershed(Forest Investment Account # 2029021)

1. INTRODUCTION This report summarizes the results of Phases I and II of the Chase Creek InterpretiveReport into the hydrology of the Chase Creek watershed [refer to Appendix A for copyof the Standards Agreement]. The report includes a summary of the availablestreamflow data collected by Water Survey of Canada [WSC] for Chase Creek since 1911as well as the water level data for two stations operated for Riverside Forest ProductsLimited in the upper watershed since 2000. The report also includes a summary of theanalytical work carried out on the data and the initial interpretation of the watershedhydrology. This report will be submitted to Technical Sub-committee of the Chase Creek WatershedCommittee for review [Phase III]. This review will provide direction for the preparationof the draft interpretive hydrology report [Phase IV].

2. BACKGROUND This project, the Chase Creek Interpretive Report, was proposed to develop a betterunderstanding of the hydrology of the watershed based on the actual streamflow dataavailable. The results of this project would also be available as the basis for futurehydrology modeling when an appropriate model becomes available. The hydrology of Chase Creek has been a concern to the residents of the watershed forthe past 15 years. In 1996 there was a major flood that caused damage to much of theprivate property along the mainstem in the central portion of the watershed as well aswithin the Village of Chase. Following this flood there were several studies undertakento assess the potential affects that forest development may have had on the 1996flooding. In addition in 1999 Riverside Forest Products Limited prepared a report titledChase Creek Watershed Management Plan to address a major mountain pine beetleinfestation. That report was based on a Total Chance Plan for the watershed andassessed the potential impacts of various levels of spread of the pine beetle andsubsequent effects on peak flows. Due to the limited streamflow and climate data forthe watershed and the lack of an effective hydrology model, it was not possible toproduce statistically valid estimates of the changes to the watershed hydrology frompotential pine beetle/harvesting scenarios. The Chase Creek watershed is approximately 285km2 [drainage area to WSC station08LE112], with Chase Creek flowing west and north from the Ptarmingon and Fly hillsarea to its confluence with the South Thompson River at the Village of Chase [refer toFigure 1]. Charcoal Creek is the largest of its tributaries with a drainage area ofapproximately 98km2. The Chase Creek watershed has an H60 elevation of 1147m[Chase Creek IWAP, 1997].

Hydrology of the Chase Creek Watershed Page 2




Water Survey of Canada has collected streamflow data in the Chase Creek watershedsince 1911. Data is available for two stations. The first, station 08LE005 known as ChaseCreek near Chase was operated on a discontinuous basis from 1911 until 1968 [refer toFigure 2]. The second station, station 08LE112 known as Chase Creek near the Mouth,has been operated continuously since 1996 [refer to Map 2]. Riverside Forest ProductsLimited has collected water level data during the spring freshet at two stations in theupper watershed since 2000. One station is located near the mouth of Charcoal Creek atthe Chase-Falkland Road and the other on upper Chase Creek at the Chase-FalklandRoad [refer to Figure 2].

3. REVIEW OF EXISTING INFORMATION

The following sections are from a literature review with specific remarks extracted fromreports regarding the hydrology of Chase Creek.

3.1 Previous Reports

Hydrology Study Chase Creek Watershed1

� Chase Creek Experienced significant floods in 1935, 1948,1972, 1975, 1982,1983, 1990, 1993, and 1996.

� Major flood damage occurred in 1935, 1975, 1982, 1990, 1993 and 1996.� Mean annual precipitation - 277mm rainfall and 127mm snowfall.� Maximum monthly precipitation on record at Chase is 170.1mm occurring in

December 1971.� Recent extreme rainfall event occurred on May 29, 1996 when 27.6mm of

rain was recorded.� Mean monthly temp for Chase and Salmon Arm correlate very well.� Most flood events are primarily snowmelt generated.� Appears to be a slight trend towards greater 24-hour storms in May and

June but probably not significant in terms of runoff.� Only extreme rain event (second highest recorded) that coincides with

extreme runoff was recorded in 1996.� No changes in typical temp, furthermore, unusually high values (temp) do

not always correspond to unusual floods, confirming that SWE and rainfallare factors in spring flood generation.

� Projected that at H60 elevation (1147m) snow would normally be gone byearly May and at 1800m it would not be fully melted until mid June.

� Base length of snowmelt hydrograph is generally 4 to 6 weeks (peakingbetween early May and June) with a rapid rise to the peak flow and anequally rapid recession to the base flow.

� Many short duration hydrographs with relatively low peaks in response torainstorms

� Normal annual peak flow is snowmelt generated and may or may not occurin combination with a rainstorm.

� Max daily flows caused by rainfall alone can occur throughout the non-wintermonths, but appear to give rise to maximum daily flows less than half oftypical snowmelt freshet peaks.

1 Steffan, Robertson and Kirsten (Canada) Inc (SRK). 1997



� Flood frequency analysis for Chase Creek (Table 1) based on regionalanalysis;

Return Period(yr)

Max Daily Flow (m3/s)

Mean annual 18.4 5 23.5

10 27.7 20 31.8 50 37.0

100 41.0 200 45.1

Table 1. Flood Frequencies for Chase Creek

� Date of peak runoff does not change as a result of logging.� After 1970, logging appears to have had an impact on the magnitude of

peak flow (max increase in peak flow calculated at 10%).� The floods of 1996 were very unusual hydrological events and not

necessarily attributable to land use changes, although may have beenexacerbated by such changes.

� Chase Creek is over recorded for water licenses.� A decreasing trend in April 1 snow water equivalent is evident regionally,

with peaks in 1956, 1975, 1982, 1983, and 1993. Of these 1982, 1983 and1993 were years with significant floods on Chase Creek.

� The 1990 and 1993 floods were a result of extreme hydrological conditions,major floods occurred in the Salmon River at the same time.

� Indications are that the upper and lower reaches of Chase Creek and theCharcoal Creek channel below the reservoir have bankfull capacities lessthen the mean annual flood.

Analysis of Historic Stream Channel Changes2

� Bed material is gravel, and banks are sand, or sand overlaying gravel, whichare easily erodible when they are not vegetated.

� Between 1930 and 1951, upper Chase Creek became very unstable andcontributed large quantities of coarse sediment to the mainstem reachbetween the Chase Falkland Road crossing and Charcoal Creek, part ofwhich has been transported downstream over the last 40 years.

� A failure of the China Lake spillway (early 70's) resulted in severe ongoingerosion of the spillway channel that transported large amounts of bed loadto Chase Creek.

� Channel instabilities appears to be related to the transport of coarsesediments.

� Channel capacity is much less in reaches storing the “sediment wedge” thathas been migrating downstream.

2 Northwest Hydraulics Consultants Ltd. 1997



Landslide Inventory for Upper Chase Creek3

� 52% of landslides natural or of unknown causes.� 52% of landslides deposited material in creek.

Chase Creek Erosion and Flood Control4

� 1948 flood resulted from a rapid snowmelt caused by warm rainfall� 1975 flood (SRK Report) resulted from an intense rainstorm during the last

stages of the spring snowmelt

3.2 Hydrometric Data Sources

Since the early 1900s there have been two hydrometric stations established byWater Survey of Canada in the Chase Creek watershed. The first is station, ChaseCreek near Chase [08LE005], was a manual gauge located approximately 3.6kmsoutheast of Chase, and 5.6km upstream of the mouth [refer to Figure 2]. Thisstation was in operation from 1911 to 1912, 1915 to 1923, 1927 to 1930, andfrom 1963 to 1968. Station 08LE005 was a staff gauge read once a day duringperiod 1 (1911 - 1930) at varying times (in a few years time of reading was notreported). Throughout period 2 (1963 - 1968) the gauge was recorded twice aday, typically at 7:00 am and 7:00 pm. A remark on the file indicates that that therecords are good5. Discharge and water level data are available and were recordedbeginning in late March or early April, and ending in late September early October.Thirteen stage discharge curves were used over the period of record.

The second station, Chase Creek near the mouth [08LE112], is locatedapproximately 15m downstream of the Paquette bridge in the Village of Chase[refer to Figure 2]. This station is currently active and has been in operation since1996 with continuous water level record (period 3, 1996 - 2002). Station 08LE112is an automated hydrometric station that transmits data via a landline throughoutthe year. This station is currently using stage discharge curve table # 11.

Riverside Forest Products Limited has collected freshet water level data since 1999at locations on upper Chase Creek and Charcoal Creek at bridge crossings on theChase-Falkland Road.

3 Kamloops Forest Region, 19964 Department of Lands, Forests and Water Resources, 19755 Personal communication with Lynne Campo, Pacific and Yukon Region, Water Survey Canada



4. ANALYSIS

4.1 Discharge Data

The mean daily streamflow data (annual hydrographs) for Chase Creek, have beenincluded in Appendix B. This included data for stations 08LE005 and 08LE112. Thefollowing tables provide a summary of the daily and monthly discharges.

TABLE 2. Chase Creek - Summary of Discharge Data

MaximumInstantaneous

Discharge

Maximum DailyDischarge

Minimum DailyDischarge

YearFlow

(m3/s)Date

occurredFlow

(m3/s)Date

occurredFlow

(m3/s)Date

occurredStation 08LE005

1911 --- --- --- --- 0.057 September 161912 --- --- 13.7 May 16 0.076 August 121915 --- --- 8.5 May 20 0.311 August 151916 --- --- 7.22 July 3 0.255 September 61917 --- --- 11.9 May 29 0.142 April 11918 --- --- --- --- 0.255 September 201919 --- --- 7.22 May 28 0.014 August 111920 --- --- 7.65 June 8 0.000 April11921 --- --- --- --- 0.142 August 161922 --- --- 11.0 June 4 0.028 September 151923 --- --- 10.5 June 23 0.127 September 131963 --- --- 9.29 May 23 0.193 September 91964 --- --- 16.0 June 3 0.371 August 251965 --- --- 15.0 June 1 0.413 August 221966 --- --- 9.20 May 7 0.156 September 91967 --- --- --- --- 0.088 September 281968 --- --- --- --- 0.215 August 12

Station 08LE1121997 40.6 May 16 33.3 May 15 0.26 Jan 271998 20.8 May 3 18.2 May 3 0.004 August 291999 35.1 May 25 21.5 May 25 0.007 March 192000 17.0 May 22 12.63 May 22 0.159 August 252001 11.2 May 24 8.55* May 24 0.019 September 112002 37.2 May 22 37.2 May 22 0.005 August 14

* The flow identified is the maximum daily discharge recorded during the 2001 freshet period,the actual maximum daily discharge for the year was 9.03m3/s and occurred on December 31,2001.



TABLE 3. Chase Creek - Mean Monthly Discharge (m3/s)

Year Jan Feb Mar Apr May June July Aug Sept Oct Nov DecStation 08LE005

1911 --- --- --- --- --- 3.5 1.29 0.244 0.098 0.105 --- ---1912 0.358 --- --- 1.82 7.66 2.55 0.678 0.128 0.344 0.18 0.187 ---1915 --- --- --- --- --- 2.44 1.88 0.545 0.325 --- --- ---1916 --- --- --- --- 3.57 4.02 2.68 0.777 0.279 0.255 --- ---1917 --- --- --- 0.287 6.01 5.98 1.39 0.429 0.206 --- --- ---1918 --- --- --- --- 4.12 0.735 0.61 0.315 --- --- ---1919 --- --- --- 0.487 3.62 2.15 0.304 0.019 0.014 --- --- ---1920 --- --- --- 0.462 3.55 5.09 1.58 0.316 0.565 --- --- ---1921 --- --- --- --- --- --- 0.765 0.204 0.17 --- --- ---1922 --- --- --- 0.31 2.77 3.75 0.305 0.118 0.07 --- --- ---1923 --- --- --- 1.1 3.02 3.91 1.52 0.315 0.117 --- --- ---1963 --- --- --- --- 5.09 2.23 1.0 0.398 0.267 --- --- ---1964 --- --- --- 0.688 4.17 7.41 1.85 0.626 1.72 --- --- ---1965 --- --- --- --- 6.08 4.11 0.887 0.923 0.657 --- --- ---1966 --- --- --- 1.66 4.89 2.71 0.848 0.352 0.18 --- --- ---1967 --- --- --- --- --- --- 0.388 0.167 0.135 --- --- ---1968 --- --- --- --- --- --- 0.689 0.358 0.631 --- --- ---Mean 0.358 --- --- 0.852 4.58 3.85 1.11 0.384 0.362 0.18 0.187 ---

Station 08LE1121996 --- --- --- --- --- --- --- --- 0.500 0.681 1.31 0.7171997 0.475 0.484 1.04 4.31 13.9 3.91 2.86 0.814 0.633 1.59 1.55 0.6361998 0.361 0.609 1.51 3.91 7.80 0.935 0.431 0.097 0.067 0.286 0.487 0.2231999 1.24 --- --- 3.21 8.75 7.17 --- --- --- --- --- ---2000 0.338 0.326 0.538 4.72 7.85 4.62 1.26 0.338 --- --- --- ---2001 0.323 0.389 0.485 1.53 5.36 2.19 0.499 --- --- --- 0.517 2.332002 0.273 0.266 0.288 3.18 10.8 4.46 0.459 0.020 0.117 0.42 0.152 0.114Mean 0.502 0.415 0.772 3.48 9.077 3.881 1.102 0.317 0.329 0.744 0.803 0.804

The spring freshet usually occurs between April and June, but has started as earlyas late March and as late as early to mid-July. Refer to Appendix C for a completesummary of the mean monthly discharge, the maximum and minimum dailydischarges, and the total monthly discharge.

4.2 Timing of freshet Flows

For station 08LE005, the date of the peak flow typically occurred in May or June.At station 08LE112 the date occurred in May for all recorded years. The minimumdaily flows typically occurred in August and September at both stations.

The start of the freshet period on the hydrograph (beginning of rising limb) variesannually. In order to capture any potential trends in the timing of the start of thefreshet, it was necessary to establish the method by which the “freshet” isdefined. Based on a review of the data it was decided that a threshold dischargeof 2m3/s would be used to define the start of the freshet. This flow was also usedto determine the end of the freshet. The dates that this flow occurred were usedto calculate the start of the freshet.



Using the above criteria, a hydrograph (Figure 3) for each of the three timeperiods (period 1 – 1911-1923, period 2 – 1963-1968, period 3 – 1996-2001) wascreated using the mean daily discharge for each time period. The mean dailydischarge data for period 1 suggested that the freshet period started on day 122(~ May 16). The mean daily discharge data for period 2 suggested that the startof the freshet occurred on day 116 (~ May 10). For period 3, the mean dailydischarge data suggested that the start of the freshet occurred on day 105 (~April 29), suggesting a trend in the advancement (i.e. freshet occurring earlierover time) of the start of the freshet period (refer to Appendix B for annualhydrographs).

Figure 3. Mean Daily Discharge by Period

4.3 Magnitude of the Peak Discharge

For station 08LE005, the maximum daily discharge typically occurred in May orJune, and only once in July. However for the current station, 08LE112, themaximum daily discharges have all occurred in May.

In order to compare the annual discharge data collected from the two differentstations, an adjustment to the maximum daily discharge was required based onwatershed area. Station 08LE112 has a drainage area of approximately 285km2

whereas station 08LE005 has a drainage area of approximately 279km2. Forstatistical comparison, the discharge data for station 08LE005 was adjusted toreflex the larger drainage area of station 08LE112. The adjustment factor basedon drainage area was 1.022. Creating a single data set for the current station will

0

2

4

6

8

10

12

14

01-Nov 21-Dec 09-Feb 31-Mar 20-May 09-Jul 28-Aug 17-Oct 06-Dec 25-JanDate

Dis

char

ge (m

3 /s)

Period 1 Daily Average (1911 - 1923) Period 2 Daily Average (1963 - 1968) Period 3 Daily Average (1996 - 2001)

Day 105, start of period 3 freshet





allow future data to be included. A review of the mean daily hydrographs for eachperiod indicates a trend of increasing peak flow over time (Figure 4).

Figure 4. Magnitude of Peak Discharge

4.4 Duration of Run-off Hydrograph

The 2m3/s threshold was used to calculate the duration of the run-off hydrograph.For Station 08LE005, the shortest freshet duration for period 1 lastedapproximately 32 days (i.e. in 1922 with a peak of 11.0m3/s) and the longestfreshet was 74 days (i.e. in 1916 with a peak of 7.22m3/s). The average length ofthe freshet for period 1 was 57 days. the shortest freshet duration for period 2lasted approximately 46 days (i.e. in 1964 with a peak of 16.0m3/s) and thelongest freshet was 69 days (i.e. in 1965 with a peak of 15m3/s). The averagelength of freshet for period 2 was 54 days. For station 08LE112, the shortestfreshet during period 3 was 37 days (i.e. in 1998 with a peak of 18.2m3/s) and thelongest was 90 days (i.e. in 1999 with a peak of 22.6m3/s). The average length ofthe freshet for period 3 was calculated at 64 days.

A review of the scatter plot of the data (Figure 5) did not identify a discernabletrend with regards to the length of the peak flow period.

0

2

4

6

8

10

12

14

01-Nov 21-Dec 09-Feb 31-Mar 20-May 09-Jul 28-Aug 17-Oct 06-Dec 25-JanDate

Dis

char

ge (m

3 /s)

Period 1 Daily Average (1911 - 1923) Period 2 Daily Average (1963 - 1968) Period 3 Daily Average (1996 - 2001)

Period 1 - Q=6.151 m3/s

Period 2 - Q = 10.148 m3/s

Period 3 - Q=11.982m3/s



Figure 5. Year Vs Duration of Peak Flow Period

4.5 Minimum Flows

For station 08LE005, the minimum daily discharge typically occurred in August orSeptember and twice in April prior to spring freshet. It should be noted that thiswas a seasonal station with data only collected from the period April throughSeptember. The minimum daily discharges recorded at station 08LE112 alsooccurred in August or September. A review of the data set does not suggest anypotential trends with regards to increasing or decreasing minimum flows overtime.

4.6 Mean Daily Discharge by Month

An analysis was completed for the mean daily discharge by month to identifypotential trends in discharge increasing or decreasing over time in any particularmonth. Unfortunately, for periods 1 and 2 the data is limited to the period fromApril to September only.

Analysis of the mean daily discharge for April (Figure 6) and May (Figure 7)identified potential increasing trends in discharge over the three time periods. Nodiscernable trends were identified in the months from July to September.

0

10

20

30

40

50

60

70

80

90

100

1910 1915 1920 1925 1930 1935 1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000

Year of peak

Leng

th o

f pea

k flo

w p

erio

d (N

umbe

r of d

ays)

Length of Peak flow Period



Figure 6. Mean Daily Discharge for April

Figure 7. Mean Daily Discharge for May

Chase Creek - 1911 to 2002Mean Daily flows in April

0.00

1.00

2.00

3.00

4.00

5.00

6.00

1900 1920 1940 1960 1980 2000 2020

Year

Dis

char

ge (m

3 /s)

April Mean Daily Discharge

Chase Creek - 1911 to 2002Mean Daily flows in May

0.00

2.00

4.00

6.00

8.00

10.00

12.00

14.00

16.00

1900 1920 1940 1960 1980 2000 2020

Year

Dis

char

ge (m

3 /s)

May Mean Daily Discharge



4.7 Analysis of Water Levels at Station 08LE112 with upper Chase Creek andCharcoal Creek

The stage data (water levels) from station 08LE112 are plotted against stage datathat were recorded manually for upper Chase Creek and Charcoal Creek (refer toAppendix E for comparison plots). This comparison indicates, as expected, thatthe peak flows in upper Chase Creek and Charcoal Creek generally coincide withthe peak flows in Chase Creek at the Mouth. It is difficult to clearly define the dateof the maximum water level in some instances due to the fact that water levelswere recorded only once per day. The purpose for collecting stage data in theupper watershed was to determine the timing of the peak flows in upper ChaseCreek, Charcoal Creek, relative to Chase Creek at the mouth. It was hypothesizedthat the peak flows from upper Chase Creek and Charcoal Creek may bedesynchronized, which might suggest that snowmelt in only one of the sub-basinsdrives peak flows in Chase Creek at the Mouth. It is apparent that a single waterlevel reading is insufficient to accurately determine the synchronicity of the flows.

TABLE 4. Water Levels for Upper Chase/Charcoal Vs Discharge for ChaseCreek at the Mouth

Upper Chase Creek Stage Charcoal StageYear WSC

Date of PeakDate of Peak Days from

PeakDate of Peak Days from

Peak1999 May 25 May 25 0 May 25 0

2000 May 22 No data - No data -

2001 May 24 May 24 0 May 23 -12002 May 22 No data - May 21 -1

4.8 Climate Change

To investigate the issue of climate change, the climate data for the weatherstations #1166945 and #166R45 at Salmon Arm was examined. The period ofrecord for precipitation data is 1912 to 2001. Examination of the total annualprecipitation (Figure 8) indicated an increase in annual precipitation over theperiod of record. To illustrate the increase in total annual precipitation the data setwas plotted as 5-year moving averages.



Figure 8. Total Annual Precipitation as a five-year moving average

A literature review found only one study6 that addressed the effects of climatechange on hydrology of six streams in south central BC. All six streamsinvestigated showed changes in temporal pattern; earlier freshet, lower latesummer-early fall flows, and higher early winter flows, and were statisticallysignificant in three streams that were examined in detail. The journal article alsostates that the results are consistent with those predicted from climate changescenarios for hydrological changes.

Other studies regarding climate change also indicate increasing trends inprecipitation throughout the central and southern interior7. Statistically significantincreasing trends in minimum daily temperatures were also noted across BC, whilethe trend of increasing maximum daily temperatures is only statistically significantin southeast BC (Kamloops, Summerland, and Cranbrook).

6 Leith, Rory M.M. and Paul H. Whitfield. Accepted June, 1998. Evidence of Climate Change Effects on

the Hydrology of Streams in South-Central BC. Canadian Water Resources Journal. Vol. 23, No. 3, 1998,P. 219.

7 Environment Canada 2001

Five-Year Running Average Salmon Arm Total Precipitation (1912 - 2000)

0

100

200

300

400

500

600

700

800

900

1000

1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

Year

5-ye

ar a

vera

ge T

otal

Ann

ual P

reci

pita

tion

(mm

)

Total Annual Precipitation - 5-year running average (mm)



5. DISCUSSION

There may be several reasons for the apparent increase in the size of peak flows. Mostlikely the apparent trend is due to the differences in the data collection methods(manual readings vs. automated station) and data collection standards. During period 1water levels were determined by recording a reading from a staff gauge once a day,typically in the morning but not always (for some years the time of reading was notreported). Because only one reading a day was recorded, it is likely that the maximumdaily flows were not captured (diurnal effect). This would result in significantly lowermean daily discharges for period 1.

Throughout period 2 water levels were recorded twice a day, typically at 7:00 a.m. and7:00 p.m. Because of the improved method of data collection, the average dailydischarge for period 2 is much closer in magnitude to that of period 3 (~10%difference). Water level recording techniques (manual vs automated) is one explanationfor the differences in the magnitude of peak flow between period 2 and 3.

Factors effecting the advancement of the start of freshet flows include climate change.Potential increasing trends for precipitation noted in April and May (refer to Figures 6and 7) may be one explanation. Increased minimum temperatures (that typically occurin the evening) may also be a main contributor to an earlier start to the freshet period.

Furthermore, it appears that the peak flow trends in Chase Creek are not significantlydifferent from those in other watersheds in south central BC6, and are consistent withexpected changes in hydrology that are predicted from climate change scenarios. Thissuggests that the Chase Creek trends are related primarily to climate change.

Of the several hydrology studies conducted to date (refer to summary in section 3),none were able to link forest harvesting activities directly to flooding experienced in themiddle and lower reaches of Chase Creek or any changes in timing of peak flows.Rather, the damaging flood events were caused by extreme hydrological conditions.Since the time that forest harvesting activities commenced (coupled with clearing ofagricultural/residential) in Chase Creek, runoff may have increased by as much as 10%(UBC model for computed flows with and without harvesting - SRK).

6. CONCLUSIONS

� Although there are 23 years of hydrometric records available it is difficult toaccurately determine trends. The reason for this is that the data was collected attwo stations at different locations in the watershed, some as manual once dailywater readings, some as twice daily water level readings, and some as continuousdata.

� It is apparent that the spring freshet usually occurs during the period April – June.� Using a threshold flow of 2 m3/s as the initiation of the spring freshet, the average

start day of the freshet is day 122 for period 1, day 116 for period 2, and day 105for period 3, suggesting a trend to an earlier freshet over the 1911-2001 period.

� Based on the published data the magnitude of the peak flow it would appear thatthere has been an increase in peak flow trend over the period of record, 1911-2001.The average peak flow for period 1 was 6.151 m3/s, for period 2 was 10.148 m3/s,



and for period 3 was 11.982 m3/s. However, due to the accuracy of the data(manual readings vs. continuous water level recording) it is not possible to concludewhether the trend is real or not.

� There was no discernable trend in the duration of the runoff over the period ofrecord. For period 1 the mean length of the freshet was 57 days, for period 2 it was54 days, and for period 3 it was 64 days.

� There was no discernable trend for the minimum flow period. Minimum flows usuallyoccurred in the August-September period for the period of record.

� There was an increasing trend in the mean daily discharges for the months of Apriland May but not for the months July through September.

� The manual water level data collected for upper Chase Creek and Charcoal Creek atthe Chase-Falkland Road was not adequate to detect whether the peak flows fromthese two sub-basins were synchronized or de-synchronized with the timing of thepeak flow for the Water Survey of Canada station Chase Creek near the Mouth.

� Assessment of the total annual precipitation recorded at Salmon Arm for the period1912-2001 indicated a well defined increasing trend in precipitation over the periodof record.

Brian GaucherProject Technologist

D.A. Dobson, P.Eng.Senior Reviewer

BG/dd

APPENDIX A

Outline of Standards

Chase Creek

Outline of Standards for Chase Creek Interpretive Report - FIA #2029021

Phase ITask: Review Streamflow and Components of StreamflowSources: Water Survey of Canada (available data is discontinuous)

City of Kamloops data summary Riverside Forest Products Limited stage date for Charcoal Creek and

upper Chase Creek

Summary: Streamflow [Q] and Components of Streamflow [S]:

1. Plot annual hydrographs using all available daily Water Survey of Canada dataprovided in the Chase Creek database

2. Review the hydrographs and summarize- any shifts in flow volumes and patterns over the

period of record- review station notes and local climate data to

identify the potential causes of any shifts observed in the record- for periods of record determined to be reliable,

summarise the data (max, mean, min) for key flow variablesincluding maximum daily discharge, peak flow volume, late seasonflow volumes, annual yield, timing of peak, duration of peak

- frequency of key streamflow events3. Obtain and plot stage data as recorded by Water Survey of Canada (include these

data in electronic format as part of the deliverables to the Chase Creek TechnicalSub-committee to be included in the Chase Creek database)

4. Compare stage at the Water Survey of Canada gauging station with stage measured atthe two upstream locations (Charcoal Creek at the Mouth and upper Chase Creek atChase-Falkland Road)

Phase IITask: Complete Preliminary ReportSource: Results from Phase I

Summary: Review and interpret streamflow [Q] and stage [S] data and preparepreliminary report for review by Chase Creek Technical Sub-committee.

4.6 Phase IIITask: Chase Watershed Committee – Technical Subcommittee MeetingSummary: Purpose of meeting: to present the results of the preliminary report onstreamflow and stage data (Phase II) and solicit direction on the interpretationmethodology for the next phase.

Note: Depending upon availability of the Technical Sub-committee members,this and the later phases may be deferred to 2003/04 fiscal year of FIAfunding.

4.6 Phase IVTask: Complete the DRAFT Interpretive Hydrology Report.Source: Comments and direction provided at Chase Creek Technical Sub-committee meeting.

Phases IV – VIIare scheduledfor 2003/04 (seenote Phase III)

Phase I, IIand IIIDelivery:March 14,2003

Summary: A comprehensive interpretive review of the available hydrometricrecord with recommendations for future data collection, if required. The goal isto provide an improved understanding of the hydrology of the watershed.

Phase VTask: Technical Review of the Final Interpretive Hydrology ReportSummary: Solicit feedback from the Chase Watershed Technical Sub-committeeon the Phase IV Report and prepare FINAL version of the InterpretiveHydrology Report

Phase VITask: Preparation of a Technical Note

Summary: Prepare a concise summary version of the Final InterpretiveHydrology ReportPhase VIITask: WAC MeetingPurpose of meeting: Present the Interpretive Report and Technical Note to theChase Creek Watershed Advisory Committee (possibly followed by theplacement of the data and Technical Note onto a website).

Note:Possible Additional Work in 2003/04 – Not included in this standardsagreement:What Role do forests play on snow accumulation – clearcut comparisons (simpleones). As there is not enough data, compare the snow and flow in Chase, andthis will help extrapolate from elsewhere.

Rev DD Feb4/03

APPENDIX B

Annual Hydrographs

1911-Chase Creek Daily Discharge - 08LE005

0

1

2

3

4

5

6

7

8

9

10

1/01/1

911

1/15/1

911

1/29/1

911

2/12/1

911

2/26/1

911

3/12/1

911

3/26/1

911

4/09/1

911

4/23/1

911

5/07/1

911

5/21/1

911

6/04/1

911

6/18/1

911

7/02/1

911

7/16/1

911

7/30/1

911

8/13/1

911

8/27/1

911

9/10/1

911

9/24/1

911

10/08

/1911

10/22

/1911

11/05

/1911

11/19

/1911

12/03

/1911

12/17

/1911

12/31

/1911

Date

Dai

ly D

isch

arge

(m3 /s

)

June 2, 1911- 8.98m3/s

1912 Chase Creek Daily Discharge - 08LE005

0

5

10

15

20

Dat

e

Janu

ary

10, 1

912

Janu

ary

20, 1

912

Janu

ary

30, 1

912

Febr

uary

9, 1

912

Febr

uary

19,

191

2

Febr

uary

29,

191

2

Mar

ch 1

0, 1

912

Mar

ch 2

0, 1

912

Mar

ch 3

0, 1

912

April

9, 1

912

April

19,

191

2

April

29,

191

2M

ay 9

, 191

2

May

19,

191

2

May

29,

191

2Ju

ne 8

, 191

2

June

18,

191

2

June

28,

191

2Ju

ly 8

, 191

2

July

18,

191

2

July

28,

191

2Au

gust

7, 1

912

Augu

st 1

7, 1

912

Augu

st 2

7, 1

912

Sept

embe

r 6, 1

912

Sept

embe

r 16,

191

2Se

ptem

ber 2

6, 1

912

Oct

ober

6, 1

912

Oct

ober

16,

191

2O

ctob

er 2

6, 1

912

Nov

embe

r 5, 1

912

Nov

embe

r 15,

191

2N

ovem

ber 2

5, 1

912

Dec

embe

r 5, 1

912

Dec

embe

r 15,

191

2

Dec

embe

r 25,

191

2

Date

Dai

ly D

isch

arge

(m3/

s) May 15, 1912 - 13.7m3/s

April 17 to June 19


0

1

2

3

4

5

6

7

8

9

1/01/1

915

1/15/1

915

1/29/1

915

2/12/1

915

2/26/1

915

3/12/1

915

3/26/1

915

4/09/1

915

4/23/1

915

5/07/1

915

5/21/1

915

6/04/1

915

6/18/1

915

7/02/1

915

7/16/1

915

7/30/1

915

8/13/1

915

8/27/1

915

9/10/1

915

9/24/1

915

10/08

/1915

10/22

/1915

11/05

/1915

11/19

/1915

12/03

/1915

12/17

/1915

12/31

/1915

Date

Dai

ly D

isch

arge

(m3 /s

)

May 20, 1915 - 8.5m3/sJune 27, 1915 - 7.79m3/s

1916 Chas Creek Daily Discharge - 08LE005

0

5

10

15

20

Dat

eJa

nuar

y 10

, 191

6

Janu

ary

20, 1

916

Janu

ary

30, 1

916

Febr

uary

9, 1

916

Febr

uary

19,

191

6

Febr

uary

29,

191

6M

arch

10,

191

6M

arch

20,

191

6

Mar

ch 3

0, 1

916

April

9, 1

916

April

19,

191

6Ap

ril 2

9, 1

916

May

9, 1

916

May

19,

191

6M

ay 2

9, 1

916

June

8, 1

916

June

18,

191

6

June

28,

191

6Ju

ly 8

, 191

6Ju

ly 1

8, 1

916

July

28,

191

6Au

gust

7, 1

916

Augu

st 1

7, 1

916

Augu

st 2

7, 1

916

Sept

embe

r 6, 1

916

Sept

embe

r 16,

191

6Se

ptem

ber 2

6, 1

916

Oct

ober

6, 1

916

Oct

ober

16,

191

6

Oct

ober

26,

191

6N

ovem

ber 5

, 191

6

Nov

embe

r 15,

191

6N

ovem

ber 2

5, 1

916

Dec

embe

r 5, 1

916

Dec

embe

r 15,

191

6D

ecem

ber 2

5, 1

916

Date

Dai

ly D

isch

arge

(m3 /s

)

May 5, 1916 - 6.51m3/s July 2, 1916 - 7.22m3/s

April 26 to July 9


0

5

10

15

20

Dat

e

Janu

ary

10, 1

917

Janu

ary

20, 1

917

Janu

ary

30, 1

917

Febr

uary

9, 1

917

Febr

uary

19,

191

7

Mar

ch 1

, 191

7M

arch

11,

191

7

Mar

ch 2

1, 1

917

Mar

ch 3

1, 1

917

April

10,

191

7Ap

ril 2

0, 1

917

April

30,

191

7

May

10,

191

7M

ay 2

0, 1

917

May

30,

191

7Ju

ne 9

, 191

7

June

19,

191

7Ju

ne 2

9, 1

917

July

9, 1

917

July

19,

191

7Ju

ly 2

9, 1

917

Augu

st 8

, 191

7Au

gust

18,

191

7

Augu

st 2

8, 1

917

Sept

embe

r 7, 1

917

Sept

embe

r 17,

191

7Se

ptem

ber 2

7, 1

917

Oct

ober

7, 1

917

Oct

ober

17,

191

7

Oct

ober

27,

191

7N

ovem

ber 6

, 191

7N

ovem

ber 1

6, 1

917

Nov

embe

r 26,

191

7D

ecem

ber 6

, 191

7

Dec

embe

r 16,

191

7D

ecem

ber 2

6, 1

917

Date

Dai

ly D

isch

arge

(m3 /s

) May 29, 1917 - 11.9m3/s

May 10 to July 8


0

5

10

15

20

1/01/1

918

1/15/1

918

1/29/1

918

2/12/1

918

2/26/1

918

3/12/1

918

3/26/1

918

4/09/1

918

4/23/1

918

5/07/1

918

5/21/1

918

6/04/1

918

6/18/1

918

7/02/1

918

7/16/1

918

7/30/1

918

8/13/1

918

8/27/1

918

9/10/1

918

9/24/1

918

10/08

/1918

10/22

/1918

11/05

/1918

11/19

/1918

12/03

/1918

12/17

/1918

12/31

/1918

Date

Dai

ly D

isch

arge

(m3 /s

)

June 1 and 10, 1918 - 7.79m3/s

April 23 to June 22


0

5

10

15

20

1/01/1

919

1/15/1

919

1/29/1

919

2/12/1

919

2/26/1

919

3/12/1

919

3/26/1

919

4/09/1

919

4/23/1

919

5/07/1

919

5/21/1

919

6/04/1

919

6/18/1

919

7/02/1

919

7/16/1

919

7/30/1

919

8/13/1

919

8/27/1

919

9/10/1

919

9/24/1

919

10/08

/1919

10/22

/1919

11/05

/1919

11/19

/1919

12/03

/1919

12/17

/1919

12/31

/1919

Date

Dai

ly D

isch

arge

(m3 /s

)

May 28, 1919 - 7.22m3/s

May 14 to June 18


0

5

10

15

20

1/01/1

920

1/15/1

920

1/29/1

920

2/12/1

920

2/26/1

920

3/11/1

920

3/25/1

920

4/08/1

920

4/22/1

920

5/06/1

920

5/20/1

920

6/03/1

920

6/17/1

920

7/01/1

920

7/15/1

920

7/29/1

920

8/12/1

920

8/26/1

920

9/09/1

920

9/23/1

920

10/07

/1920

10/21

/1920

11/04

/1920

11/18

/1920

12/02

/1920

12/16

/1920

12/30

/1920

Date

Dai

ly D

isch

arge

(m3 /s

)

June 8 and 16 - 7.65m3/s

May 6 to July 11


0

1

2

3

4

5

6

7

1/01/1

921

1/15/1

921

1/29/1

921

2/12/1

921

2/26/1

921

3/12/1

921

3/26/1

921

4/09/1

921

4/23/1

921

5/07/1

921

5/21/1

921

6/04/1

921

6/18/1

921

7/02/1

921

7/16/1

921

7/30/1

921

8/13/1

921

8/27/1

921

9/10/1

921

9/24/1

921

10/08

/1921

10/22

/1921

11/05

/1921

11/19

/1921

12/03

/1921

12/17

/1921

12/31

/1921

Date

Dai

ly D

isch

arge

(m3 /s

)

June 8, 1921 - 6.31m3/s


0

5

10

15

20

1/01/1

922

1/15/1

922

1/29/1

922

2/12/1

922

2/26/1

922

3/12/1

922

3/26/1

922

4/09/1

922

4/23/1

922

5/07/1

922

5/21/1

922

6/04/1

922

6/18/1

922

7/02/1

922

7/16/1

922

7/30/1

922

8/13/1

922

8/27/1

922

9/10/1

922

9/24/1

922

10/08

/1922

10/22

/1922

11/05

/1922

11/19

/1922

12/03

/1922

12/17

/1922

12/31

/1922

Date

Dai

ly D

isch

arge

(m3 /s

)

June 3, 1922 - 11.0m3/s

May 16 to June 17


0

5

10

15

20

1/01/1

923

1/15/1

923

1/29/1

923

2/12/1

923

2/26/1

923

3/12/1

923

3/26/1

923

4/09/1

923

4/23/1

923

5/07/1

923

5/21/1

923

6/04/1

923

6/18/1

923

7/02/1

923

7/16/1

923

7/30/1

923

8/13/1

923

8/27/1

923

9/10/1

923

9/24/1

923

10/08

/1923

10/22

/1923

11/05

/1923

11/19

/1923

12/03

/1923

12/17

/1923

12/31

/1923

Date

Dai

ly d

isch

arge

(m3 /s

)

June 23, 1923 - 10.5m3/s

May 6 to July 10


0

5

10

15

20

1/01/1

963

1/15/1

963

1/29/1

963

2/12/1

963

2/26/1

963

3/12/1

963

3/26/1

963

4/09/1

963

4/23/1

963

5/07/1

963

5/21/1

963

6/04/1

963

6/18/1

963

7/02/1

963

7/16/1

963

7/30/1

963

8/13/1

963

8/27/1

963

9/10/1

963

9/24/1

963

10/08

/1963

10/22

/1963

11/05

/1963

11/19

/1963

12/03

/1963

12/17

/1963

12/31

/1963

Date

Dai

ly D

isch

arge

(m3 /s

)

May 23, 1963 - 9.29m3/s

April 26 to June 16


0

5

10

15

20

1/01/1

964

1/15/1

964

1/29/1

964

2/12/1

964

2/26/1

964

3/11/1

964

3/25/1

964

4/08/1

964

4/22/1

964

5/06/1

964

5/20/1

964

6/03/1

964

6/17/1

964

7/01/1

964

7/15/1

964

7/29/1

964

8/12/1

964

8/26/1

964

9/09/1

964

9/23/1

964

10/07

/1964

10/21

/1964

11/04

/1964

11/18

/1964

12/02

/1964

12/16

/1964

12/30

/1964

Date

Dai

ly D

isch

arge

(m3 /s

)

June 2 1964 -16m 3/s

May 9 to June 24


0

5

10

15

20

1/01/1

965

1/15/1

965

1/29/1

965

2/12/1

965

2/26/1

965

3/12/1

965

3/26/1

965

4/09/1

965

4/23/1

965

5/07/1

965

5/21/1

965

6/04/1

965

6/18/1

965

7/02/1

965

7/16/1

965

7/30/1

965

8/13/1

965

8/27/1

965

9/10/1

965

9/24/1

965

10/08

/1965

10/22

/1965

11/05

/1965

11/19

/1965

12/03

/1965

12/17

/1965

12/31

/1965

Date

Dai

ly D

isch

arge

(m3 /s

)

June 1, 1965 - 15.0m3/s

April 13 to June 21


0

5

10

15

20

1/01/1

966

1/15/1

966

1/29/1

966

2/12/1

966

2/26/1

966

3/12/1

966

3/26/1

966

4/09/1

966

4/23/1

966

5/07/1

966

5/21/1

966

6/04/1

966

6/18/1

966

7/02/1

966

7/16/1

966

7/30/1

966

8/13/1

966

8/27/1

966

9/10/1

966

9/24/1

966

10/08

/1966

10/22

/1966

11/05

/1966

11/19

/1966

12/03

/1966

12/17

/1966

12/31

/1966

Date

Dai

ly D

isch

arge

(m/s

)

May 7, 1966 - 9.2m3/sJune 1, 1966 - 7.28m3/s

May 4 to June 17


0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

1/01/1

967

1/15/1

967

1/29/1

967

2/12/1

967

2/26/1

967

3/12/1

967

3/26/1

967

4/09/1

967

4/23/1

967

5/07/1

967

5/21/1

967

6/04/1

967

6/18/1

967

7/02/1

967

7/16/1

967

7/30/1

967

8/13/1

967

8/27/1

967

9/10/1

967

9/24/1

967

10/08

/1967

10/22

/1967

11/05

/1967

11/19

/1967

12/03

/1967

12/17

/1967

12/31

/1967

Date

Dai

ly D

isch

arge

(m3 /s

)


0

0.5

1

1.5

2

2.5

3

3.5

4

1/01/1

968

1/15/1

968

1/29/1

968

2/12/1

968

2/26/1

968

3/11/1

968

3/25/1

968

4/08/1

968

4/22/1

968

5/06/1

968

5/20/1

968

6/03/1

968

6/17/1

968

7/01/1

968

7/15/1

968

7/29/1

968

8/12/1

968

8/26/1

968

9/09/1

968

9/23/1

968

10/07

/1968

10/21

/1968

11/04

/1968

11/18

/1968

12/02

/1968

12/16

/1968

12/30

/1968

Date

Dai

ly D

isch

arge

(m3 /s

)


0

1

2

3

4

5

6

7

8

9

10

1/01/1

996

1/15/1

996

1/29/1

996

2/12/1

996

2/26/1

996

3/11/1

996

3/25/1

996

4/08/1

996

4/22/1

996

5/06/1

996

5/20/1

996

6/03/1

996

6/17/1

996

7/01/1

996

7/15/1

996

7/29/1

996

8/12/1

996

8/26/1

996

9/09/1

996

9/23/1

996

10/07

/1996

10/21

/1996

11/04

/1996

11/18

/1996

12/02

/1996

12/16

/1996

12/30

/1996

Date

Dai

ly D

isch

arge

(m3 /s

)


0

5

10

15

20

25

30

35

1/01/1

997

1/15/1

997

1/29/1

997

2/12/1

997

2/26/1

997

3/12/1

997

3/26/1

997

4/09/1

997

4/23/1

997

5/07/1

997

5/21/1

997

6/04/1

997

6/18/1

997

7/02/1

997

7/16/1

997

7/30/1

997

8/13/1

997

8/27/1

997

9/10/1

997

9/24/1

997

10/08

/1997

10/22

/1997

11/05

/1997

11/19

/1997

12/03

/1997

12/17

/1997

12/31

/1997

Date

Dai

ly D

isch

arge

(m3 /s

)

May 15, 1997 - 33.3m3/s

July 12, 1997 - 14.9m3/s

April 16 to June 14


0

5

10

15

20

1/01/1

998

1/15/1

998

1/29/1

998

2/12/1

998

2/26/1

998

3/12/1

998

3/26/1

998

4/09/1

998

4/23/1

998

5/07/1

998

5/21/1

998

6/04/1

998

6/18/1

998

7/02/1

998

7/16/1

998

7/30/1

998

8/13/1

998

8/27/1

998

9/10/1

998

9/24/1

998

10/08

/1998

10/22

/1998

11/05

/1998

11/19

/1998

12/03

/1998

12/17

/1998

12/31

/1998

Date

Dai

ly D

isch

arge

(m3 /s

)

May 3, 1998 - 18.2m3/s

April 21 to May 28


0

5

10

15

20

25

1/01/1

999

1/15/1

999

1/29/1

999

2/12/1

999

2/26/1

999

3/12/1

999

3/26/1

999

4/09/1

999

4/23/1

999

5/07/1

999

5/21/1

999

6/04/1

999

6/18/1

999

7/02/1

999

7/16/1

999

7/30/1

999

8/13/1

999

8/27/1

999

9/10/1

999

9/24/1

999

10/08

/1999

10/22

/1999

11/05

/1999

11/19

/1999

12/03

/1999

12/17

/1999

12/31

/1999

Date

Dai

ly D

isch

arge

(m3 /s

)

May 25, 1999 - 22.6m3/s

April 18 to July 17


0

5

10

15

1/01/2

000

1/15/2

000

1/29/2

000

2/12/2

000

2/26/2

000

3/11/2

000

3/25/2

000

4/08/2

000

4/22/2

000

5/06/2

000

5/20/2

000

6/03/2

000

6/17/2

000

7/01/2

000

7/15/2

000

7/29/2

000

8/12/2

000

8/26/2

000

9/09/2

000

9/23/2

000

10/07

/2000

10/21

/2000

11/04

/2000

11/18

/2000

12/02

/2000

12/16

/2000

12/30

/2000

Date

Dai

ly D

isch

arge

(m3 /s

)

May 21, 2000 - 12.6m3/s

April 22 to June 28


0

5

10

15

20

1/01/2

001

1/15/2

001

1/29/2

001

2/12/2

001

2/26/2

001

3/12/2

001

3/26/2

001

4/09/2

001

4/23/2

001

5/07/2

001

5/21/2

001

6/04/2

001

6/18/2

001

7/02/2

001

7/16/2

001

7/30/2

001

8/13/2

001

8/27/2

001

9/10/2

001

9/24/2

001

10/08

/2001

10/22

/2001

11/05

/2001

11/19

/2001

12/03

/2001

12/17

/2001

12/31

/2001

Date

Dai

ly D

isch

arge

(m3 /s

)

May 15, 2001 - 8.4m3/sMay 24, 2001 - 8.55m3/s

April 25 to June 19


0

5

10

15

20

25

30

35

40

1/01/2

002

1/15/2

002

1/29/2

002

2/12/2

002

2/26/2

002

3/12/2

002

3/26/2

002

4/09/2

002

4/23/2

002

5/07/2

002

5/21/2

002

6/04/2

002

6/18/2

002

7/02/2

002

7/16/2

002

7/30/2

002

8/13/2

002

8/27/2

002

9/10/2

002

9/24/2

002

10/08

/2002

10/22

/2002

11/05

/2002

11/19

/2002

12/03

/2002

12/17

/2002

12/31

/2002

Date

Dai

ly D

isch

arge

(m3 /s

)

May 22, 2002 - 37.2m3/s

April 12 to June 24

APPENDIX C

Summary of Data

CHASE CREEKMaximum Monthly Discharge

Year jan Feb March April May June July August September October November December1911 - - - - - 8.98 3.88 0.368 0.159 0.142 - -1912 - - 0.595 4.47 13.7 4.47 1.53 0.269 0.963 0.311 0.227 -1915 - - - - 8.5 7.79 3.54 1.16 0.453 - - -1916 - - - - 6.51 6.23 7.22 1.3 0.396 0.255 - -1917 - - - 0.595 11.9 9.63 4.25 1.13 0.311 - - -1918 - - - - - 7.79 1.22 1.02 0.566 - - -1919 - - - 2.27 7.22 3.54 0.85 0.028 0.014 - - -1920 - - - 1.61 6.23 7.65 3.91 0.793 0.9006 - - -1921 - - - - - - 2.15 0.34 0.17 - - -1922 - - - 0.566 8.44 11 0.566 0.227 0.227 - - -1923 - - - 2.18 5.38 10.5 3.48 0.566 0.227 - - -1963 - - - - 9.29 5.21 1.78 0.951 0.578 - - -1964 - - - 1 10.6 16 5.21 1.08 4.05 - - -1965 - - - - 12.7 15 1.84 0.211 1.17 - - -1966 - - - 2.52 9.2 7.28 2.09 0.583 0.215 - - -1967 - - - - - - 0.83 0.263 0.227 - - -1968 - - - - - - 1.7 1.12 1.94 - - -

1996 - - - - - - - - 1.18 2 3.1 1.11997 0.636 0.592 2.32 10.3 33.3 11.4 14.9 1.24 1.94 3.2 4.33 0.951998 0.65 0.786 3.43 12.7 18.2 1.41 1.37 0.265 0.252 0.464 0.867 0.441999 8.44 - - 9.33 21.5 12.2 - - - - - -2000 0.539 0.426 0.722 11 12.6 8.14 2.25 0.843 - - - -2001 0.374 1.47 0.654 5.33 8.55 4.2 0.997 - - - 1.59 9.032002 0.453 0.393 0.595 8.03 37.2 9.52 1.58 0.05 0.212 0.829 0.205 0.139

Site 08LE005

Site 08LE112

CHASE CREEKMinimum Monthly Discharge

Year jan Feb March April May June July August September October November December1911 - - - - - 1.27 0.351 0.079 0.057 0.057 - -1912 - - 0.142 0.204 4.16 0.504 0.269 0.076 0.076 0.099 0.142 -1915 - - - - - 1.16 1.16 0.311 0.311 - - -1916 - - - - 1.98 2.27 1.53 0.396 0.255 0.255 - -1917 - - - 0.142 0.736 3.03 0.453 0.198 0.198 - - -1918 - - - - - 1.22 0.425 0.425 0.255 - - -1919 - - - 0.142 1.13 0.85 0.028 0.014 0.014 - - -1920 - - - 0 1.36 2.38 0.283 0.283 0.283 - - -1921 - - - - - - 0.34 0.142 0.17 - - -1922 - - - 0.085 0.878 0.651 0.17 0.085 0.028 - - -1923 - - - 0.283 1.25 1.44 0.354 0.227 0.127 - - -1963 - - - - 2.69 0.855 0.453 0.204 0.193 - - -1964 - - - 0.416 0.855 2.18 0.799 0.371 0.433 - - -1965 - - - - 2.94 1.05 0.484 0.413 0.47 - - -1966 - - - 1.27 1.19 0.929 0.45 0.204 0.156 - - -1967 - - - - - - 0.156 0.102 0.088 - - -1968 - - - - - - 0.28 0.215 0.261 - - -

1996 - - - - - - - - 0.175 0.424 0.754 0.361997 0.26 0.32 0.44 1.71 7 2.01 1.24 0.516 0.308 0.657 0.968 0.51998 0.14 0.395 0.594 1.59 1.42 0.663 0.088 0.004 0.004 0.185 0.354 0.031999 0.295 - - 1.09 3.37 3.72 - - - - - -2000 0.18 0.24 0.378 0.731 4.4 1.66 0.598 0.159 - - - -2001 0.246 0.219 0.269 0.521 3.15 0.902 0.128 - - - 0.295 0.3432002 0.16 0.175 0.16 0.608 2.68 1.42 0.028 0.005 0.055 0.101 0.098 0.09

Site 08LE005

Site 08LE112

CHASE CREEKMean Monthly Discharge

Year jan Feb March April May June July August September October November December1911 - - - - 3.5 1.29 0.244 0.098 0.105 - -1912 - - 0.358 1.82 7.66 2.55 0.678 0.128 0.344 0.18 0.187 -1915 - - - - 2.44 1.88 0.545 0.325 - - -1916 - - - 3.57 4.02 2.68 0.777 0.279 0.255 - -1917 - - - 0.287 6.01 5.98 1.39 0.429 0.206 - - -1918 - - - - 4.12 0.735 0.61 0.315 - - -1919 - - - 0.487 3.62 2.15 0.304 0.019 0.014 - - -1920 - - - 0.462 3.55 5.09 1.58 0.316 0.565 - - -1921 - - - - - 0.765 0.204 0.17 - - -1922 - - - 0.31 2.77 3.75 0.305 0.118 0.07 - - -1923 - - - 1.1 3.02 3.91 1.52 0.315 0.177 - - -1963 - - - 5.09 2.23 1 0.398 0.267 - - -1964 - - - 0.688 4.17 7.41 1.85 0.626 1.72 - - -1965 - - - 6.08 4.11 0.887 0.923 0.657 - - -1966 - - - 1.66 4.89 2.71 0.848 0.352 0.18 - - -1967 - - - - - 0.388 0.167 0.135 - - -1968 - - - - - 0.689 0.358 0.631 - - -

1996 - - - - - - - - 0.5 0.681 1.31 0.7171997 0.475 0.484 1.04 4.31 13.9 3.91 2.86 0.814 0.633 1.59 1.55 0.6361998 0.361 0.609 1.51 3.91 7.8 0.935 0.431 0.097 0.067 0.286 0.487 0.2231999 1.24 - - 3.21 8.75 7.17 - - - - - -2000 0.338 0.326 0.538 4.72 7.85 4.62 1.26 0.338 - - - -2001 0.323 0.389 0.485 1.53 5.36 2.19 0.499 - - - 0.517 2.332002 0.273 0.266 0.288 3.18 10.8 4.46 0.459 0.02 0.117 0.42 0.152 0.114

Site 08LE112

Site 08LE005

CHASE CREEKTotal Monthly Discharge

Year jan Feb March April May June July August September October November December1911 - - - - 105.03 40.001 7.553 2.945 3.244 - -1912 - - 11.109 54.742 237.48 76.474 21.025 3.959 10.318 5.576 5.606 -1915 - - - - - 73.17 58.43 16.898 9.756 - - -1916 - - - - 110.7 120.66 83 24.088 8.355 7.905 - -1917 - - - 8.609 186.302 179.45 43.008 13.299 6.166 - - -1918 - - - - - 123.57 22.773 18.919 9.453 - - -1919 - - - 14.601 112.16 64.42 9.43 0.574 0.42 - - -1920 - - - 13.858 109.96 152.69 48.948 9.793 6.938 - - -1921 - - - - - - 23.72 6.324 5.1 - - -1922 - - - 9.287 85.902 112.401 9.462 3.653 2.097 - - -1923 - - - 32.951 93.68 117.41 47.109 9.754 5.313 - - -1963 - - - - 157.65 66.922 31.043 12.34 8.005 - - -1964 - - - 20.645 129.343 222.39 57.465 19.404 51.737 - - -1965 - - - - 188.61 123.44 27.498 28.603 19.699 - - -1966 - - - 49.71 151.49 81.369 26.28 10.907 5.408 - - -1967 - - - - - - 12.035 5.191 4.045 - - -1968 - - - - - - 21.373 11.096 18.921 - - -

1996 - - - - - - - - 14.986 21.1 39.242 22.2291997 14.712 13.551 32.214 129.28 430.36 117.34 88.69 25.219 18.976 49.183 46.587 19.7241998 11.189 17.045 46.828 117.39 241.77 28.04 13.368 3.005 2.005 8.858 14.615 6.91999 38.543 - - 96.26 271.17 214.98 - - - - - -2000 10.468 9.441 16.67 141.487 243.25 138.57 39.169 10.491 - - - -2001 10.003 10.901 15.023 45.783 166.3 65.742 15.478 - - - 15.51 72.2942002 8.461 7.444 8.941 95.311 335 133.85 14.222 0.616 3.514 13.01 4.548 3.52

Site 08LE005

Site 08LE112

APPENDIX D

Trend Analyses

Chase Creek - 1911 - 2002 Maximum Daily Discharge - Station 08LE005 (adjusted) and 08LE112

0

5

10

15

20

25

30

35

40

1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

Year

Adj

uste

d D

isch

arge

(m3 /s

)

Max Flow = -262.65 + 0.14 YearP-Value = 0.005

Chase Creek - 1911 - 2002 Minimum Daily Discharge - Station 08LE005 (adjusted) and 08LE112

0.00

0.10

0.20

0.30

0.40

0.50

1900 1920 1940 1960 1980 2000 2020

Year

Adj

uste

d D

isch

arge

(m3 /s

)

Min Flow = 0.71 - 0.0003 YearP-Value = 0.71

Chase Creek 1911 - 2002(Day of Peak flow)

0

40

80

120

160

200

1910 1920 1930 1940 1950 1960 1970 1980 1990 2000Year

Day

of P

eak

Flow

(# o

f day

s in

year

)

Date = 581.99 - 0.22 YearP-Value = 0.016

Chase Creek 1911 - 2002 (Duration of Peak flow Period)

0

20

40

60

80

100

1910 1920 1930 1940 1950 1960 1970 1980 1990 2000

Year

Dura

tiono

f pea

k flo

w (N

umbe

r of d

ays)

Length = -91.62 + 0.08 YearP-Value = 0.45

Salmon Arm - 1912 - 1997 Total Annual Precipitation

0

200

400

600

800

1000

1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

Year

Prec

ipita

tion

(mm

)

Precip = -3856.37 + 2.25 YearP-Value < 0.001

APPENDIX E

1999 to 2002 Stage Data Comparison

1999 Chase Creek Freshet Stage Data

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

5/24/1

999

5/25/1

999

5/26/1

999

5/27/1

999

5/28/1

999

5/29/1

999

5/30/1

999

5/31/1

999

6/01/1

999

6/02/1

999

6/03/1

999

6/04/1

999

6/05/1

999

6/06/1

999

6/07/1

999

6/08/1

999

6/09/1

999

6/10/1

999

6/11/1

999

6/12/1

999

6/13/1

999

6/14/1

999

6/15/1

999

6/16/1

999

6/17/1

999

Date

Wat

er le

vel (

m)

1999 Upper Chase stream level 1999 Charcoal stream level 1999 Chase stream level - 08LE1112

2000 Chase Creek Freshet - Stage Data

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.64/

18/2

000

4/20

/200

0

4/22

/200

04/

24/2

000

4/26

/200

0

4/28

/200

04/

30/2

000

5/02

/200

0

5/04

/200

05/

06/2

000

5/08

/200

0

5/10

/200

05/

12/2

000

5/14

/200

0

5/16

/200

05/

18/2

000

5/20

/200

0

5/22

/200

05/

24/2

000

5/26

/200

0

5/28

/200

05/

30/2

000

6/01

/200

0

6/03

/200

06/

05/2

000

6/07

/200

0

6/09

/200

06/

11/2

000

6/13

/200

06/

15/2

000

6/17

/200

0

6/19

/200

06/

21/2

000

6/23

/200

0

6/25

/200

0

Date

Wat

er L

evel

(m)



0.00

0.20

0.40

0.60

0.80

1.00

1.20

1.40

1.60

4/27/2

001

4/29/2

001

5/01/2

001

5/03/2

001

5/05/2

001

5/07/2

001

5/09/2

001

5/11/2

001

5/13/2

001

5/15/2

001

5/17/2

001

5/19/2

001

5/21/2

001

5/23/2

001

5/25/2

001

5/27/2

001

5/29/2

001

5/31/2

001

6/02/2

001

6/04/2

001

6/06/2

001

Date

Wat

er L

evel

(m)



0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

5/01/2

001

5/03/2

001

5/05/2

001

5/07/2

001

5/09/2

001

5/11/2

001

5/13/2

001

5/15/2

001

5/17/2

001

5/19/2

001

5/21/2

001

5/23/2

001

5/25/2

001

5/27/2

001

5/29/2

001

5/31/2

001

6/02/2

001

6/04/2

001

6/06/2

001

6/08/2

001

6/10/2

001

6/12/2

001

6/14/2

001

6/16/2

001

6/18/2

001

6/20/2

001

6/22/2

001

6/24/2

001

6/26/2

001

6/28/2

001

6/30/2

001

Date

Wat

er L

evel

s (m

)


APPENDIX F

Station 08LE005 Stage Data

1915 Chase Creek Water Level - 08LE005

0.00

0.20

0.40

0.60

0.80

1.00

1.205/09/1915

5/16/1915

5/23/1915

5/30/1915

6/06/1915

6/13/1915

6/20/1915

6/27/1915

7/04/1915

7/11/1915

7/18/1915

7/25/1915

8/01/1915

8/08/1915

8/15/1915

Date

Gau

ge le

vel (

m)


0.00

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

0.90

4/05/1

915

4/12/1

915

4/19/1

915

4/26/1

915

5/03/1

915

5/10/1

915

5/17/1

915

5/24/1

915

5/31/1

915

6/07/1

915

6/14/1

915

6/21/1

915

6/28/1

915

7/05/1

915

7/12/1

915

7/19/1

915

7/26/1

915

8/02/1

915

8/09/1

915

8/16/1

915

8/23/1

915

8/30/1

915

Date

Wat

er L

evel

(m)


0.00

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

0.90

1.00

4/01/1

919

4/08/1

919

4/15/1

919

4/22/1

919

4/29/1

919

5/06/1

919

5/13/1

919

5/20/1

919

5/27/1

919

6/03/1

919

6/10/1

919

6/17/1

919

6/24/1

919

7/01/1

919

7/08/1

919

7/15/1

919

7/22/1

919

7/29/1

919

8/05/1

919

8/12/1

919

8/19/1

919

8/26/1

919

Date

Wat

er L

evel

(m)


0.00

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

0.90

4/11/1

963

4/18/1

963

4/25/1

963

5/02/1

963

5/09/1

963

5/16/1

963

5/23/1

963

5/30/1

963

6/06/1

963

6/13/1

963

6/20/1

963

6/27/1

963

7/04/1

963

7/11/1

963

7/18/1

963

7/25/1

963

8/01/1

963

8/08/1

963

8/15/1

963

8/22/1

963

8/29/1

963

Date

Wat

er L

evel

(m)


0.00

0.20

0.40

0.60

0.80

1.00

1.20

4/01/1

964

4/08/1

964

4/15/1

964

4/22/1

964

4/29/1

964

5/06/1

964

5/13/1

964

5/20/1

964

5/27/1

964

6/03/1

964

6/10/1

964

6/17/1

964

6/24/1

964

7/01/1

964

7/08/1

964

7/15/1

964

7/22/1

964

7/29/1

964

8/05/1

964

8/12/1

964

8/19/1

964

8/26/1

964

9/02/1

964

9/09/1

964

9/16/1

964

9/23/1

964

9/30/1

964

Date

Wat

er L

evel

(m)


0.00

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

0.90

1.00

4/05/1

965

4/12/1

965

4/19/1

965

4/26/1

965

5/03/1

965

5/10/1

965

5/17/1

965

5/24/1

965

5/31/1

965

6/07/1

965

6/14/1

965

6/21/1

965

6/28/1

965

7/05/1

965

7/12/1

965

7/19/1

965

7/26/1

965

8/02/1

965

8/09/1

965

8/16/1

965

8/23/1

965

8/30/1

965

9/06/1

965

9/13/1

965

9/20/1

965

9/27/1

965

Date

Wat

er L

evel

(m)


0.00

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

0.90

4/01/1

966

4/08/1

966

4/15/1

966

4/22/1

966

4/29/1

966

5/06/1

966

5/13/1

966

5/20/1

966

5/27/1

966

6/03/1

966

6/10/1

966

6/17/1

966

6/24/1

966

7/01/1

966

7/08/1

966

7/15/1

966

7/22/1

966

7/29/1

966

8/05/1

966

8/12/1

966

8/19/1

966

8/26/1

966

9/02/1

966

9/09/1

966

9/16/1

966

9/23/1

966

9/30/1

966

Date

Wat

er L

evel

(m)


0.00

0.05

0.10

0.15

0.20

0.25

0.30

7/01/1

967

7/08/1

967

7/15/1

967

7/22/1

967

7/29/1

967

8/05/1

967

8/12/1

967

8/19/1

967

8/26/1

967

9/02/1

967

9/09/1

967

9/16/1

967

9/23/1

967

9/30/1

967

Date

Wat

er L

evel

(m)


0.00

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

6/27/1

968

7/04/1

968

7/11/1

968

7/18/1

968

7/25/1

968

8/01/1

968

8/08/1

968

8/15/1

968

8/22/1

968

8/29/1

968

9/05/1

968

9/12/1

968

9/19/1

968

9/26/1

968

Date

Wat

er L

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hydrology of the chase creek watersheda100.gov.bc.ca/appsdata/acat/documents/r3745/chasefinal...the...

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