For the composite curve number CN: 69.5, estimate the amount of runoff (in inches) if the direct rainfall is 20 in.
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- a) 7 c) d) 300 8 The ordinates of the hyetograph of a 6-hr duration rainfall is given below. If the direct runoff is 33 mm, estimate the D-index in mm/hr. Time (hr) Rainfall intensity 10 0 (mm/hr) 0 1 7 2 18 3 25 14 10 5 3 6 12Question 2. A 4-hour UH (GH) has the values shown below. Determine the runoff from a design downpour that will consist of the determined net precipitations: 20 mm/hr net precipitation for 2 hours, no precipitation for the next 2 hours, then 10 mm/hr precipitation for 2 hours. Assume that the groundwater base flow is a constant 3 m3/s during the design downpour time (hour) UH4 (m³/s) 0 0 2 2.35 4 7.00 6 9.75 8 7.50 10 4.20 12 1.80 14 05. From the 1mm 6 hour unity hydrograph given below, derive the 2 hour unit hydrograph. Time 12 18 24 30 (hrs) UH 15 8 3.6 0.6 0.0 (cumecs) What would be the peak surface runoff resulting from 3mm of rainfall falling in the space of two hours?
- 4. A 4-hr storm rains on a 100 km² drainage watershed. The surface runoff data from a gaging station draining the watershed are given below: Time (hr) 0 2 4 6 8 10 12 14 16 18 20 22 Direct Runoff, Q (m³/s) 0 0 200 600 900 700 500 300 200 100 0 0 (a) Construct the unit hydrograph for the 4-hour storm. (b) Find the runoff rate at t = 10 hr from a three-storm system: The first storm has an average depth of 6 cm starting at t = 0 hr. The second storm has an average depth of 14 cm starting at t = 4 hr. The third storm has an average depth of 8 cm starting at t = 6 hr.A 0.10 mi2 parking lot has a runoff coefficient of 0.8 and a time of concentration of 40 minutes. For the following three rainstorms, determine the peak discharge (in ft3/s) using the Rational Method. a. 4.0 in/hr for 10 minutes b. 1.0 in/hr for 40 minutes c. 0.5 in/hr for 60 minutesThe 4-hr rainfall for successive 30 minutes intervals is as shown below. If the surface runoff is 6 cm. The value index will be A 3.9 cm/h B 3.125 cm/h C 3.4 cm/h D 3.7 cm/h Time (min) 0 30 60 90 120 150 180 210 240 Rainfall (cm) 0 0.8 2.4 4.1 1.6 2.9 3.2 1.5 2
- From the the given table, determine the direct runoff if the effective rainfall during 1-hr is 5 mm if the 1-hr UH due to 1 mm effective rainfall is known: Time (hr) UH (m^3/s) Q direct 3. 2. 3. 1. 4. Write the answer and attach the solution.Show full solution.According to rainfall data collected by a laboratory during storm events, the precipitation level in inches (X) varies jointly with runoff in cubic feet per second (Y). The joint probability mass function (PMF) of both variables are given by the following Table: Y 1 2 3 10 0.05 0.15 0 20 0.1 0.25 0.25 30 0 0.1 0.1 a. Determine and plot the marginal PMF of runoff.b. Determine the correlation coefficient between X and Y.Q1: The following time distribution of the rainfall, estimate the -Index and W- Index of the rainfall if the surface runoff from this rainfall is (2 cm)? Time (hr) 2 3 4 5 Rainfall (cm) 1.2 1.5 0.9 0.6 1 0.5
- Determine the direct runoff, the O-index, and the excess rainfall Set hyetograph for the storm given below. The water shed is 7.0 mi?. Label x and y axis for your graph. The baseflow is 300 cfs. Time Preciipitation Streamflow in 0.00 150 0.5 0.10 180 1.0 0.40 200 1.5 1.50 800 2.0 2.50 2000 2.5 2.00 5000 3.0 0.40 9000 3.5 0.10 10000 4.0 8000 4.5 4000 5.0 2500 5.5 1800 6.0 1100 6.5 700 7.0 300 7.5 290 8.0 270Exercise [2] For a given basin, the following are the infiltration capacity rates at various time intervals after the beginning of the storm. Make a plot of the f-curve and establish an equation of the form developed by Horton. Also, determine the total rain and the excess rain (runoff). Time Precipitation rate Infiltration capacity (min) (cm/hr) (cm/hr) 1 5.0 3.9 2 5.0 3.4 5.0 3.1 4 5.0 2.7 5.0 2.5 6. 7.5 2.3 8. 7.5 2.0 10 7.5 1.8 12 7.5 1.54 14 7.5 1.43 16 2.5 1.36 18 2.5 1.31 20 2.5 1.28 22 2.5 1.25 1 Irigation Engineering Assignment No.[1] Time Precipitation rate Infiltration capacity (min) (cm/hr) (cm/hr) 24 2.5 1.23 26 2.5 1.22 28 2.5 1.20 30 2.5 1.20 Note: Excess rain (runoff) = Total precipitation Infiltration loss.Q2:- The following is the set of observed data for successive 15 minutes period of 105 minutes storm in a catchment 10r 7.0 4.5 2.0 2.0 1.25 1.25 4- 3.0 o. 15 30 45 60 75 90 105 Time (min.) If the value of o-index is 3 cm/hr, estimate the net runoff, the total rainfall and the value of W-index.