Time (h) Intensity (mm/h) 10 15 12 off curve number is CN = 76. Calculate the p-index. 0 2 4
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- Runoff data have been collected for a 4-hour storm over a 120 acre watershed as indicated in the table. If the total volume of water infiltrated during the storm was 3.0 Ac-ft and the Phi Index is 0.1 in/hr, sketch the rainfall hyetograph with EVERYTHING labeled appropriately. Also, report the depth and volume of precipitation (in inches and Ac-ft, respectively) for each 1-hour period.The incremental rainfall intensity data given in the table below were recorded at a gage located on a small urban watershed. Using a 0.5‐hour time step: (a) Plot the rainfall Hyetograph. (b) Determine the total rainfall depth during the storm event. (c) If the runoff depth is 4.65 mm, find the phi- index in mm/ hr.determine φ index and time of rainfall excess given surface runoff as 9.3 cm for a nine-hour storm event.
- please show steps and explain If the rainfall excess consists of two bursts of 3.3 in./hr and 1.8 in./hrs, each for 20 minutes, and the 20-minute UH (1”) hasordinates of 15, 40, 25, and 10 ft3/s, compute the distribution of direct runoff.The table below shows the observed rainfall intensity on a 2.26 km? catchment area. Estimate the o index if the observed runoff is 282 097 m3.Rational methodAnswer the following questions referring to the Intensity-Duration-Frequency curves and runoff coefficient data below: (a) What is the return period of a storm that recorded 2.0 inches/hour for 2 hours in Houston? (b) What amount of rain (in inches) would have to fall in a 6-hour period to be considered a 10-year storm in Houston? (c) What is the return period of a storm that lasts 2 hours and records 3.5 inches of rainfall?
- A catchment area has a time of concentration of 20 minutes, an area of 20 has. and a runoff coefficient of 0.25. Estimate the peak discharge corresponding to a 25-year period if the intensity-duration-frequency for the storm in the area can be expressed by KT* i = D + a where i = intensity in cm/hr. T = return period in years, and D = duration of storm in hours; The coefficients are: K = 6.93, x = 0.189, a = 0.50 and n 0.878If fo = 0.7 in./hr, fc = 0.2 in./hr, and K = 0.5 hr-1, determine the distribution of losses and the depth of rainfall excess for 2-hour storm with intensity of 1.3 in/hr.The use of rational formula assumes that rainfall occurs uniformly over the entire watershed. True or False.
- The ordinates of a hydrograph of surface runoff resulting from 4.5cm of rainfall excess of duration 8 hours in a catchment are as follows. Determine the ordinates of the 8h unit hydrograph for this catchment. Tabulate your solution and plot the 8H-UH.A storm with 12 cm precipitation produced a direct surface runoff of 7.2 cm in the equivalent depth unit. Assume the duration of the excess rainfall (te) is equal to the total duration of the storm for the first trial, te = 5 hr. Compute the trial value of ØThe length of a parking lot is L = 100 m, and it is sloped at So = 0.02. The surface of the lot is bare clay with a Manning roughness factor of n = 0.020. A rainstorm produces a constant rainfall excess at the rate of ?0 = 25 mm/hr. If td = 25 minutes: Determine the runoff hydrograph at the downstream end of the parking lot. Based on your answers in Step 1, draw your estimated hydrograph. ***Convert i0 to mJs. This conversion is not given and I cannot find it.