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U.S. Geological Survey
Iowa Water Science Center
Iowa City, IA 52240
319-358-3615
by David Eash
Iowa StreamStats Implementation of Design –
Peak-Flow Determination
Presented at the ASCE Environmental and
Water Resources ConferenceAmes, IA
April 3, 2014
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What is StreamStats?
A map-based Web application that provides
information that can be used by engineers,
managers, and planners to make informed
decisions on water-related activities
Primary products are basin delineations, basin-
characteristic measurements, and estimates of
streamflow statistics
Program allows for the analysis of upstream and
downstream relations along streams
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How is StreamStats Information Used?
Engineering Design—Bridges, culverts, roads, levees, dams, and other structures along streams; flood-plain mapping
Water and Land Management—Water rights adjudication, in-stream flows, fish passage/habitat studies
Water Quality Regulation—Low flows, perennial vs. intermittent streams (TMDL’s, NPDES Permits)
Sampling Network Design—Cover a range of desired flows
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StreamStats Site Capabilities
Provides published streamflow statistics and basin characteristics for USGS streamgages
For user-selected ungaged sites:
• Delineates drainage basin boundaries
• Allows editing of basin boundaries, if necessary
• Computes basin characteristics
• Provides estimates of streamflow statistics based on regression equations
• Allows for download of basin boundary shapefiles
• Allows the printing of maps shown in user interface
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StreamStats Implementation for Iowa
74 regression equations from 3 USGS streamflow-
estimation reports will be implemented in StreamStats
StreamStats will allow users to click on any ungaged
or gaged stream site in Iowa and obtain estimates of
30 streamflow statistics
7 low-flow statistics that include 4 annual and 2
seasonal low-flow probabilities and the harmonic
mean
15 flow-duration statistics that include 1% - 99%
exceedance probabilities
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StreamStats Implementation for Iowa
8 peak-flow statistics that include 2- to 500-year
recurrence-interval floods
90-percent prediction intervals will be computed for
an ungaged site (for low-flow & peak-flow regression
estimates)
Peak-flow equations were implemented in June 2013
Low-flow and flow duration equations will be
implemented in near future
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IA StreamStats app uses peak-flow regional-
regression equations published in SIR 2013-5086
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New Iowa Flood Regions
3
3
1
2
2
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518 streamgages used for defining six
flood regions
1
3
2
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Northwest
Northeast
Southern
Iowa Low-Flow Regions
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IA StreamStats app will use low-flow regional-
regression equations published in SIR 2012-5171
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Flood Region 1 Regression Equation
Regression equations take the form:
Q1%=DRNAREA0.56610(0.917+0.567 I24H10Y-0.742
CCM^0.55)
where:
DRNAREA is drainage area, in square miles
I24H10Y is maximum 24-hour precipitation that
occurs on average once in 10 years, in inches
CCM is constant of channel maintenance (DRNAREA/
total length of all streams in basin), in mi2/mi
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Flood Region 1 Drainage-Area Only
Regression Equation
Regression equations take the form:
Q1%= 102.67 DRNAREA0.524
where:
DRNAREA is drainage area, in square miles
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Flood Region 2 Regression Equation
Regression equations take the form:
Q1% = 10(11.1 - 7.92 x DRNAREA^-0.031 -0.002 x DESMOIN
-0.025 x BSHAPE)
where:
DRNAREA is drainage area, in square miles
DESMOIN is percent area of basin within Des
Moines Lobe landform region (percent area)
BSHAPE is a shape factor measure of basin
shape computed as BASLEN2/DRNAREA
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Flood Region 3 Regression Equation
Regression equations take the form:
Q1% = 10(6.41 – 3.06 x DRNAREA^-0.097 – 0.009 x KSATSSUR
– 0.035 x BSHAPE)
where:
DRNAREA is drainage area, in square miles
KSATSSUR is the average saturated hydraulic
conductivity of soil (micrometers per second)
BSHAPE is a shape factor measure of basin shape
computed as BASLEN2/DRNAREA
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Watershed Delineation from a Point
1. User selects point on stream
2. Point is transferred to a cell in a flow-direction grid derived from a DEM
3. GIS determines boundary from flow-direction grid up to points at which the boundary for the new site intersects boundaries in boundary map layer
4. GIS accumulates all upstream areas and dissolves internal boundaries
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National
Hydrography
Dataset (NHD)
Watershed
Boundary
Dataset (WBD)
National
Elevation
Dataset (NED)
StreamStats Integrates NHD Streams, WBD
Boundaries and NED Elevation in ArcHydro
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Burning and Walling of DEM
Forces DEM to agree with stream
network and WBD or locally
digitized drainage boundaries
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12-digit HUCs Watershed Boundary Dataset
1
2
3
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StreamStats Similar Gages tool estimates
flows at ungaged sites based on flows at
at nearby streamgages for drainage-area
ratios between 0.5 and 1.5
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Regional exponents table 15
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New Statistical Methodologies included in
the Iowa Peak-Flow Estimation Study
Flood-probability analyses include results of new
statewide regional skew analysis (Bayesian
GLS/WLS regression analysis – constant value -0.4)
New flood-probability analysis method used - EMA
(expected moments algorithm) with new MGB
(multiple Grubbs-Beck) test for detecting low-outliers
New optimization test used for selecting best
transformation for drainage area for the regression
analyses - either a log 10 or a power transformation
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QUESTIONS
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Iowa Regional Skew Study
Bayesian WLS/GLS Regression
1982 (MSE = 0.302) 2010 (MSE = 0.160)ERL = 17 yrs ERL = 50 yrs
Constant
Regional
Skew Value
for Iowa =
-0.400
240 gages
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Effects of including or censoring low
outliers
Figure 5
West Branch Floyd River near Struble
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Flood Region 3 transformations of
drainage area for Q1%
Figure 8
Log-10
transformation
of DA
Power
transformation
of DA
DA-0.097
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Relative % change between EMA/MGB &
B17B/GB using new skew for Q1%
283 Iowa streamgages – Q1%
Figure 11
RPchange = 100(Qnew-Qold/Qold)Mean 11.8 %
Median 2.0 %
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Figure 12
283 Iowa streamgages
Relative % change between EMA/MGB new
skew & B17B/GB old skew for Q1%
Mean 5.0 %
Median -2.1 %
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Relative % change between Q1% using
RREs from 2013 and 2001 reports
Figure 13
185 Iowa streamgages
Mean 7.9
Median 6.4
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Iowa StreamStats Introductory Page
Lists statistics
estimated
Gives report
referenceLink to Iowa StreamStats
application
Other issues,
cooperative
statement
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National Station Statistics Site
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Base Layers
Street MapWorld TopoUSA TopoImagery
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Streamgage Reports
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State Applications
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Iowa User Interface
Toolbar
Console
Panel
Banners
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Working With Panels
Click on plus (+) sign to
expand list
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Display Streamgages
Check box beside layer
name (Stream Gages)
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Navigation Panel
Click on points of
compass to move map
center
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Overview Map
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User Interface at Iowa StreamStats
Startup 1:4,500,000
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Zoom-in to Ames area to 1:80,000
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Zoom-in to Ames area to 1:10,000
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Example Point Selection (1:2,000)
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Select Ungaged Site
Scale must indicate
1:24,000 or greater
Click on Watershed
Delineation from a
Point
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Watershed Delineation from a Point
1. User selects point on stream
2. Point is transferred to a cell in a flow-direction grid derived from a DEM
3. GIS determines boundary from flow-direction grid up to points at which the boundary for the new site intersects boundaries in boundary map layer
4. GIS accumulates all upstream areas and dissolves internal boundaries
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National
Hydrography
Dataset (NHD)
Watershed
Boundary
Dataset (WBD)
National
Elevation
Dataset (NED)
StreamStats Integrates NHD Streams, WBD
Boundaries and NED Elevation in ArcHydro
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Burning and Walling of DEM
Forces DEM to agree with stream
network and WBD or locally
digitized drainage boundaries
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Example Basin Delineation
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Flow Statistics from Regression Equations
Click on Estimate Flows
Using Regression Equations
• Regression equation
estimates assume natural
flow conditions at the
selected site
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StreamStats Ungaged Site Report
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Multi-Region Basin Calculation
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Multi-Region Basin Calculation
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Multi-Region Basin Calculation
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Multi-Region Basin Calculation
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Multi-Region Basin Calculation
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Edit a Delineated Basin Tool