At a station, Storm I of 5 hour duration with intensity 2 cm/h resulted in a runoff of 4 cm and Storm II of 8 hour duration resulted in a runoff of 8.4 cm. Assume that the -index is the same for both the storms. The intensity of storm II (in cm/h) is:
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At a station, Storm I of 5 hour duration with intensity 2 cm/h resulted in a runoff of 4 cm and Storm II of 8 hour duration resulted in a runoff of 8.4 cm. Assume that the -index is the same for both the storms. The intensity of storm II (in cm/h) is:
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- During a 6 hour storm, the total rainfall was recorded as 15 cm over an area of 900 km2. If the surface runoff determined from the hydrograph is 1x108 m3, calculate the phi-index.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 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 small urban watershed has four rain gauges as located in the figure. Total rainfall recorded at each during a storm event is listed. Compute the mean aerial rainfall for this storm using T.P.MRunoff 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.A 6 hour storm has 6 cm of rainfall and the resulting runoff was 3 cm. if the phy index remains at the same value, which one of the following is the runoff due to 12 cm of rainfall in 9 hours in the catchment?
- 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 0.878Q- A catchment area of 65 Sq. Km. in Gilgit received a rainfall of 12 cm from a 3-hours storm. At the outlet of the catchment, a natural stream had a steady flow of 10 cumecs before the storm and experienced a runoff lasting for 20 hours with an average discharge value of 90 cumecs. The stream was again to its original steady state with a flow of 10 cumecs. Estimate the losses and ratio of runoff to precipitation.The 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.
- R The following table show the precipitation in (mm/hr.) observed at the rain gages (A, B, and C) which shown in figure belo 1. Find the average precipitation each hr. over the catchment by Thiessen method . 2. Draw a graphical relation between the average precipitation each hr. and the time. - 3. Find the (& and W- index), if the runoff volume=104.4 cm.km® thr.) 1 2 3 a 5 Rain gage A 5 | [45 [ | & 8 3 7 [35 = [ 2 % a 9 |20 | 12 | & ain gage c i 10km rain gage - ain gge 106mRainfall intensity of a rural catchment is 50 mm/hr. The percentage contributions of catchment relief, catchment storage and ground characteristics in the calculation of runoff coefficient are 0, 5 and 30 respectively. What is the value of the S0-year ARI runoff coefficient (C) of this catchment? Write your answer correct to two decimal place.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.