During a two-hour storm the precipitation over a 100-acre area is 1.2 in. There is a constant infiltration at a rate of 0.4 in./hour. The depression storage is 20 acre-ft. Is there any runoff? If yes, how much? Disregard evaporation during the storm.
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During a two-hour storm the precipitation over a 100-acre area is 1.2 in. There is a constant infiltration at a rate of 0.4 in./hour. The depression storage is 20 acre-ft. Is there any runoff? If yes, how much? Disregard evaporation during the storm.
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- If the runoff from an area of 22 m^2 is 16.5 L/min, determine the infiltration capacity under a constant rainfall intensity of 90 mm/hr.The 4 hourly rainfall data are given below. fo the initial value of the infiltration capacity is 6 mm/hr,and f0 the limit value of the infiltration capacity is 2 mm/hr and k is 0.4 1/hr. Hour: 1 Precipitation (mm): 4 Hour: 2 Precipitation (mm): 12 Hour: 3 Precipitation (mm): 17 Hour: 4 Precipitation (mm): 27 what is the runoff rate?Given the rainfall excess hyetograph and the 1-hr UH below: Time (hr) 0 1 2 3 4 5 6 7 8 Excess rainfall (in) 1 2 1 0.5 Direct runoff (cfs) 0 100 200 400 300 200 100 50 0 Compute the resulting storm hydrograph and assume no losses to infiltration and evapotranspiration
- The 4 hourly rainfall data are given below. fo the initial value of the infiltration capacity is 6 mm/hr,and f0 the limit value of the infiltration capacity is 2 mm/hr and k is 0.4 1/hr. Hour: 1 Precipitation (mm): 4 Hour: 2 Precipitation (mm): 12 Hour: 3 Precipitation (mm): 17 Hour: 4 Precipitation (mm): 27 What is the infiltration in 4 hour?find the following : 1- Inflow discharge (cm/6-months) = ? 2- ΔS (cm/6-months)= ? 3- Evaporation (in/6-months) = ? 4- Evaporation (L/6-months) = ?A 10-acre pond is located within a 640-acre watershed. The pond is lined with compacted class so seepage is negligible. During a thirty day period, the rain was 2.5 in. The average streamflow into the pond was 0.45 ft3 /s and out of the pond was 0.1 ft3 /s. By the end of the 30 days, the water level in the pond had risen 1.9 inches. Determine the evaporation over the 30 days in inches of water.
- The following rainfall Heights were measured at a rainfall station. Draw a hyetograph of this precipitation. Calculate the infiltration Index Φ since the flow height is 44 mm.Answer these both questions a. The total observed runoff volume during a 4 hr storm with uniform intensity of 2.8cm/hr is 25.2 x106 m3 from basin of 280km2 area. What is the average infiltration rate for the area. b. A volume of 3x106 m3 of groundwater was pumped out from unconfined aquifer uniformly over an area of 5 km2. The pumping lowered the water table from 102 to 99m. The specific yield of the aquifer is?For a small drainage area, the infiltration rate at the start of rainfall storm was record to be 90 mm/hr and decreased exponentially to a constant rate of 8 mm/hr after 2.5 hr. The total infiltration during 2.5 hr was 50 mm. Develop the Horton's equation for the infiltration rate at any time t < 2.5 hr
- An infiltration capacity curve has the following parameters: fc, the equilibrium infiltration capacity is 17 mm/hr; fo, the initial infiltration is 123 mm/hr; k, the rate constant is 0.4 hr-1; Two rainstorms pass over identical basins of area 80 km2 with the above characteristics. The first storm has a continuous rainfall of 50 mm/hr for 6 hours. The second storm has a rainfall of 75mm/hr for 1 hour, followed by 25 mm/hr for 1hour, followed by 75 mm/hr for 1hour, followed by 25 mm/hr for 1 hour, followed by 75 mm/hr for 1hour, followed by 25 mm/hr for 1 hour also for a total of six hours. Calculate the volume of infiltrated water (in m3) over the first hour, over the first four hours, and over the total six hours. Do so for each of the storms. Comment and try to explain any similarity or difference in the answers for the two storms.The evaporation rate from the surface of a 3,650-acre lake is 100 acre-ft/day. Estimate the depth change in the lake in feet during a 1-year period if the net inflow to the lake is 25 cfs. Is the depth increasing or decreasing What is the change in centimeters?(b) Design a slow sand filter to treat a flow of (96) ft3/day? Assume a filtration rate of 0.16 m/hr.