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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- 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.Estimate the amount of rain storage (in inches) in a 6-acre parking lot using the following rainfall and runoff data for one hour period. Rainfall = 0.48 inches, evaporation = 0.31, rainfall excess = 6 ft3/s measured at the outlet of the parking lot.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.
- The runoff volume is expressed in the units of depth similar to the precipitation units. Select one True Falsedetermine φ index and time of rainfall excess given surface runoff as 9.3 cm for a nine-hour storm event.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 Ø
- 8. Determine the mean runoff flow in cfs from a drainage area of 175 acres using the English equation for a 25-yr frequency in inches per hour in Nevada. The area is sloping at 2% and is covered with poor surface grass. The furthest point from the inlet is 72 meters.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 minutesFor 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
- 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.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)