Calculate the amount of rainfall that occurred over a catchment of 200 km2 which resulted in a runoff volume of 20 m3/s. Assume that 70% of the rainfall coverts to runoff.
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Calculate the amount of rainfall that occurred over a catchment of 200 km2 which resulted in a runoff volume of 20 m3/s. Assume that 70% of the rainfall coverts to runoff.
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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.If the annual precipitation is 114 cm/yr, the land area is 13,289 m2, and the runoff coefficient is 0.4, what is the storm water runoff from this land area? (in m3/d with 2 decimal points)Three cm of rain falls on a 20,000 hectares catchment area during a 24 hours period. If 70% of rainfall runs off, calculate the average rate of runoff in m3/s if runoff lasts for 72 hours. Show complete solution.
- Rainfall 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 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.For the following rainfall rate, find the net runoff in cm, total rainfall and the value of W-index. Take Ø-index = 3. Time (min) 10 20 30 40 50 60 70 Rain rate (cm/hr) 2.5 2.5 10 7.5 1.25 1.25 5
- Estimate ∅-index for a watershed having an area 5 acres. The runoff volume caused by the rainfall is 56000 ft^3. Round off your answer to the nearest whole number. Indicate the unit. Plot the hyetograph and superimpose the final ∅-index. (1 acre = 43560 ft^2) * Using the rounded-off ∅-index, estimate the volume of infiltration losses in cubic feet. *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.Average runoff from a 600 km2 catchment area was measured as 60 m3/s 3 points for a 3-hr period .If the depression storage is 10 cm and infiltration is 0.8 in what is the depth of rainfall (precipitation) in m ?
- A catchment area of 150 km2 received 150 cm of rainfall in a year. At the outlet of the catchment, the flow in the stream draining the catchment was found to have an average rate of (i) 2.0 m3/s for 3 months, (ii) 3.02 m3/s for 6 months, and (iii) 5.02 m3/s for 3 months. (a) What is the runoff coefficient of the catchment? (ii) If the afforestation of the catchment reduces the runoff coefficient to 0.35, what is the increase in the abstraction from precipitation due to infiltration, evaporation and transpiration for the same annual rainfall of 150 cm? please convert in m/s2. The flood data and base flow in a storm are estimated for a storm in a catchment area of 600 km2. Estimate the rainfall excess.Rainfall of intensity of 20mm/h occurred over a watershed of area 100 hafor a duration of 6 h measured direct runoff volume in the stream drainingthe watershed was found to be 30,000 cubic meters. What is theprecipitation not available for runoff in this case?