hydro survey meth

7/29/2019 Hydro Survey Meth

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GENYEM HPP

Method StatementHIDROLOGY MEASUREMENT FOR DETAILED DESIGN GENYEM

HPP - PAPUA

1. Prefase

Genyem HPP is located on down stream of Sermo river, Papua. Based on FS and

RFP in Bid Doc this project will construct with “run-off river” type (ROR), with

average discharge at diversion intake 13 m3/sec and reliability discharge will be

97% or 12 m3/sec.

Allthough there are some avalaible secondary data and FS report of Genyem HPP

it is necessary to have lattest Hydrologi data to convince the parameters that will

used for detailed design by perform the Hydrology measurement survey and

analisys.

The survey purpose are :

1.

To obtain river discharge of Sermo River and Rewo River2. To obtain water level recording of Sermo River and Rewo River

3. To obtain sedimentation (suspended and bed load) of Sermo River and RewoRiver

4. To obtain water physical & chemistry quality of Sermo River and Rewo River

The Analisys purpose are :

1. Secondary data collecting and Study , which gotten from some source

such as BMG, Water Management , Public Work, PLN Wilayah etc.

2. Data analisys process which will review from prefious FS to compile with

site survey

3. Calculate the Hydrology posibility using some formula & standard

PT. WASKITA KARYA – GXED/TKL halaman 1



GENYEM HPP

4. Optimizing studi of turbine operation based on its analisys & calculation

compile with wet & dry season concideration.

2. The Team

To conduct the Hydrology Measurement and analisys the consultant need to

perform team for implementation both site and analisys office .

The minimum team configuration will be as follow :

a. Hidrologi Specialist

b. Water Manajement Engineer

c. Hydrolic Engineer i

d. Computer Engineer

e. Hydrologist Assistant

f. Water Manajement Assistant

g. Surveyors

3. Implementation Schedule


No. Description 1st week 2nd week 3rd week 4th week 5th week 6th week

1. Preparation

2. Mobilization

3. Reconnaisance

4. Staffgauge Installment

5.

Sermo river Flow Measurement,

Cross Section and Sampling at

Intake area

6.

Sermo river Flow Measurement,

Cross Section and Sampling at

Power-house area

7.Rewo river Flow Measurement,

Cross Section and Sampling

8. Laboratory Test

9. Analysis and Reporting



GENYEM HPP

4. Scope of Works

4.1. Installment & Read of staff-gauge/Peilschaal

a. Installment & Read of staff-gauge/Peilschaal will implement at Intake

location and Power house location .

b. The elevation of Installment of staff-gauge/Peilschaal must tightened

to the nearest geodetic pole refferenced.

c. Read of staff gauge will every two hours in a day

d. Result report will take note everyday and daily weather information.

4.2. River Cross Section

a. The location for cross section measurement will take at Intake location

and Power house location .

b. Cross section should be made 90º against river flow using Theodolit

measure equipment.

c. The interval of cross section measurement not more than 3 m wide

(Sermo River and Rewo River)

4.3. Measuring the River Velocity

a. River velocity should be measure with callibratted current meter .

b. The location of velocity measurement will take at cross section around

Intake location and Power house location .

c. Measuring should on Low , Medium and High water Level

d. Read of Current meter will every two hours in a day (15 times totally),

for Sermo River and Rewo River




GENYEM HPP

4.4 Sediment Sampling

4.4.1 Suspended Load Sampling

a. Suspended load is the transport of bed particles which are in

suspension when the gravity force is counterbalanced by upward

forces due to the turbulence of the flowing water. This will sampled at

INTAKE location

b. Taking of sample and Velocity measurement will done at the same time

and same frequent.

c. Before fill in the sample the surveyor should measuring the water

temperature

d. Laboratory test for each sample will consist the concentrate of sample

e. For each bottle sampler should have some information such as :

• Sample Number

• Location

• Time & Day

• Staff gauge data

• Distance from river edge

• Themperature

4.4.2. Bed Load Sampling

a. Bed load is the transport of sediment particles sliding, rolling or

jumping over and near the riverbed, it will take sample Intake location

and Power house location using the sampler/Grabber.

b. Sample taking will conduct 4 times on 3 point of river wide.




GENYEM HPP

c. Before fill in the sample into bottle the surveyor should measuring

the water temperature

d. Laboratory test will consist Gradient and Specific gravity

e. For each bottle sampler should have some information such as :

i. Sample Numberii. Locationiii. Time & Dayiv. Staff gauge data

v. Distance from river edgevi. Themperature




GENYEM HPP

5. Laboratory Test & Analysis

a. Water sample will test in laboratory to have water quality analysis

such as :Fisically charateristic : PH, Conductivity, turbidity, total hardness ,

etc.Chemical content : Sulfat, nitrat, chloride, calcium, mercury,

etc.

6. Water discharge curve

Water discharge curve will be performed by on to 2 locations are water Intakeand Power-house, accordingly this activity consist, as follows:

a. To perform river cross sectionb. To measure water floe velocityc. To analyze and calculate water discharge

7. Survey Equipment

In carry out field Hydrology Measurement the consultant need to provide survey

equipment for implementation .

The minimum survey equipment will be as follow :

a. Current meterb. Grabberc. Dept Integrating water sample

d. Peiilschaal/staff gauge

e. Water thermometerf. Theodolitg. GPSh. Camerai. Botle sample




GENYEM HPP

8. Analysis and Reporting

The engineer team will perform analysis the possibility of turbine operational

during the life time of Power plant interconnected to system in the future.

Analysis it self will need several data’s and professional parameters such as:

1. Long life discharge (30 – 50 years) of Sermo river from existing

related government institutional such as PU Pengairan, BMG , Balai

Besar Sungai , PLN wilayah, PLN Pikitring, etc. Particularly to

analyze the power plant operation in extreme hydrology condition

such as Wet or Dry long season.2. Hydrology data for calculate and analyze flood discharge of Sermo

river with 500 yearly cycles.

3. Perform a “rule curve ” data to analize power plant opertion in

various hydroloy condition (wet, normal and dry). For each

condition will take 2 “rule curve ” with percentage of probability .

4. Perform “ stream – flow forecsting “ (monthly basis) for data

proccesing that will take the suitable rule curve to be choosen for

optimizing.

5. Perform Hidraulic data which will use for Genyem power plant

detailed design analysis such as : Water hammer, Water presure in

water way, Power generation posibility, Energy optimizing in

related Lay out/Hydraulic structure .

6. Perform Operation manual to operate the power plant in aspect of

hydrology and hydraulic.




GENYEM HPP

The hydrology survey Report & result from field and laboratory will prepared and

presented as a report which has contents includes:

1. Discharge measurement report content of time of measurement, water level,

cross section area, water velocity and river discharge.

2. Water level measurement report content of water level record and weather

condition.

3. Suspended sediment sampling report content of water level, sediment

concentration, river discharge and rate of sedimentation.

4. Bed load material sampling report content of specific gravity, sieve analysis

and grain size.

5. Water sampling report content of physics and chemistry parameter (organic

chemistry and radioactivity).


hydro survey meth

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