2. [20 pts] Draw the direct runoff hydrograph for a 2-hr effective rainfall that generates total...
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
Hydrologic analysis of a watershed Problem2: The unit hydrograph is the direct runoff generated by 1 unit (I mm in this problem) of excess rainfall. The one-hour unit hydrograph of a watershed is given by: 4 Time (hour) -0.9 U0.4 U0.2 0.0 0.0 U-0.6 Unit hydrograph (m/s/mm) (a) The 100-year storm over the watershed has the following excess rainfall pulses: Fromt 0 to 1 hour, P45 mm From t I to 2 hours, P20 From t = 2 to 3...
The area is 20 km^2 A hydrograph for was obtained for this representative catchment and is given below. 1.Calculate the precipitation excess that would be needed to obtain this hydrograph from the unit hydrograph method. The resulting precipitation excess corresponds to a 30-min time duration. Show the unit hydrograph in table format. (2) 2.Determine the runoff hydrograph for a 30min rainfall excess of 2cm. (2) 3.Estimate the runoff hydrograph for a 50min rainfall excess of 3cm. (4) Time (hr) Runoff...
6. Total direct runoff was measured as 5.0 inches from the | following total rainfall hyetograph. Find a Phi (d) index [15] t (in/hr) to separate infiltration loss. 4 3 2 3 4 Time (hr) □0.3 □0.5 □ 0.4
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...
Storm data were collected for a 810-acre basin. Approximations for the wadi-flow, rainfall and runoff cumulative mass curves are shown in the following figure. 5.00 500 485 4.75 450 445 4.50 4.25 4.00 425 Cumulated DRO -Cumulated gross rainfall Wadi-flow 400 3.75 3.50 350 3.25 315 3.00 295 300 2.75 Cumulated Gross rainfall and DRO in inches 2.50 250 Wadi flow (cfs) 2.25 215 2.00 200 1.75 1.50 155 150 140 1.25 1.00 100 90 0.75 75 0.50 55 50...
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...
3 and 4 3. Discharge rates for a flood hydrograph passing the outlet of a 600-acre drainage basin is given below. The flood was produced by a uniform rainfall rate of 2.75 in/hr, which started at 9 am and ended abruptly at 11 am. Time (hr)Q (cfs) 8:00 AM100 9:00 AM100 10:00 AM 300 11:00 AM 500 12:00 PM 700 1:00 PM800 2:00 PM600 3:00 PM400 4:00 PM 300 5:00 PM 6:00 PM 100 7:00 PM100 200 a) At what...
2. (20pts) The discharge rates for an 1-hr unit hydrograph are given (see Table 1). Develop a 3-hr hydrograph with 2 in prepicitation (a rough sketch is optional) Table 1. 1-hr UH Time, hr Runoff (cfs) 0 0 100 2 250 3 150 4 0 1 Working table:
2.9 Storm data (Fig. P2-9) were recorded for a storm over a 205-acre basin on Sep- 9 tember 1, 1999. Approximations for the rainfall and runoff cumulative mass curves are shown by the black dashes in the figure. (a) Determine the duration and average intensity of the rainfall (b) What is the time to peak for this storm? (c) Find the φ index for this storm using the rainfall and hydrograph data. (d) Develop a UH for this watershed using...