QUESTION 6
The ordinates of a 3-hour unit hydrograph for a particular basin are given be-low. Determine the ordinates of the S-curve hydrograph and therefrom the ordinates of the 6-hour unit |
|
hydrograph. |
Time (hr) |
3- hr UH m3/s |
0 |
0 |
3 |
1.5 |
6 |
4.5 |
9 |
8.6 |
12 |
12.0 |
15 |
9.4 |
18 |
4.6 |
21 |
2.3 |
24 |
0.8 |
27 |
0 |
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QUESTION 6 The ordinates of a 3-hour unit hydrograph for a particular basin are given be-low....
Below is a unit hydrograph for 1 h of effective precipitation of 1 mm. Time (h) Ordinates (m3/s) 0 0 1 0.1 2 0.5 3 0.8 4 1.2 5 0.9 6 0.7 7 0.4 8 0.2 9 0 1. Apply the unit hydrograph to create a predicted stormflow hydrograph for a precipitation event in which 5 mm of rain falls in the first hour and 18 mm of rain falls in the second hour. Time (h) UHG ordinates (m3/s) Stormflow...
6. a) The hydrograph observed at the outlet of a basin of area 160 km2 is given in a table below. It is assumed that the rainfall intensity is constant at 50 mm/hr and the infiltration index is 10 mm/hr. Derive the unit hydrograph of a basin. t(min) 30 60 90 120 150 Q (m/s) 200 800 1400 800 200 200 0 b) Please calculate the total runoff hydrograph (with baseflow) if uniform rainfall depth 2cm occurs within an hour.
Question J. (2010 ) A 2-hour unit hydrograph for a drainage area is given below. a) Derive the streamflow hydrograph for a storm that produces 0.5 in. and 1.0 in. of excess precipitation over two consecutive 2-hour periods. Assume the baseflow is negligible. b) What is the peak rate of the streamflow and time to peak? Present all steps of your calculations. UH Time (hr) (cfs) 0 12 26 12 8 0 14
The 4-hr unit hydrograph for a watershed is given as below. Time (hr) 2 4 6 8 10 12 14 Unit hydrograph (m3/s/10 mm) A design storm has 1.5 cm/hr in first 2 hr and 1.0 cm/hr in the second 2 hr. The abstraction rate is 0.5 cm/hr. Base flow is 10 m/s. Calculate the total runofi hydrograph.
hydrology Have 30mins Q1) (25 Points) Discharge of total flood hydrograph is given below. Basin area is 100 km2, precipitation intensity is 80 mm/hr and the infiltration rate is 20 mm/hr. If the base flow is 100 m3/sec, then find the unit hydrograph and duration of precipitation. The total flood hydrograph is given in Table 1 and drawn below. Table 1. Total Flood Hydrograph 40 60 80 100 0 20 120 140 160 t(minutes) Q(m3/sec) 100 700 610 520 430...
2. [10 points] Determine the 4-hr unit hydrograph using the following data for a watershed having a drainage area of 200 km, assuming a constant rainfall abstraction rate of 1 cm per time period and a constant baseflow of 20 m3's. The ordinates of the unit hydrograph are in units of m s cm Four-hour period | 1 | 2-1 3 i 41 5 6 7 8 9 10| 11 Rainfall (cm) Streamflow (m s) 20 35 60 95 130...
Use the 1-h Unit Hydrograph tabulated below to (a) Predict the total streamflow hydrograph that would be observed as a result of a storm whose effective rainfall is also tabulated below. Assume a constant baseflow of 150 m/s. Time 1-H Unit Hydrograph (m/s) 0.00 40.00 130.00 210.00 150.00 120.00 80.00 40.00 15.00 0.00 Time (h) Effective Precipitation (ERH) (cm/h) 1.0 2.0 0-3 3-6 6-9 b) Route the following hydrograph through a river reach for which K = 12.0 h and...
QUESTION 4 Use the 1.h unit hydrograph tabulated below to predict the direct runoff hydrograph that would be observed as a result of a storm whose effective rainfall is also tabulated below. 2 Unit hydrograph Time 1-h UHG (h) (m3/s.cm) 1 0 18.75 65.625 150 178.125 128.125 87.5 8 53.125 25 106.25 9 Effective rainfall hyetograph Time Excess rainfall (h) (cm/h) 0-3 3-6 6 -9 1.0 2.0 1.5 1201
2. A 10-minute unit hydrograph (UH) of a catchment is given in the table below. What is the catchment area? (5 marks) Time step (10 minutes) 1 2 3 4 Discharge (mº/{s.cm)) 8 18 30 10 For a storm partern given in the table below, determine and plot runoff hydrograph at a 5-minute interval using the above 10-minute UH. Determine the time of concentration of the catchment. Assume the o index value for the catchment to be 12 mm/hr, and...
The stream flows due to three successive storms of 3.7, 6 and 2.7 cm of 6-hours durationeach on a basin are given below. The area of the basin is (4444) km2.Assuming a constant base flow of 8.5 m3/s and ϕ-index of 0.25 cm/hour, derive a 6 hourunit hydrograph.Time (Hours) Stream-Flow(m3/s)Time (Hours) Stream-Flow(m3/s)0 8 21 423 12 24 316 15 27 219 27 30 1412 39 33 1015 46 36 918 49 39 8reg no 4444