1. Calculate the runoff coefficient for use in the Rational Method if a watershed consist of 5 acres Woodland (C=0.25) and 20 acres of cropland (C-0.60). a. 0.425 b. 0.85 C. 0.60 d. 0.53
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- The runoff volume is expressed in the units of depth similar to the precipitation units. Select one True FalseCompute the diameter (cm) of the outfall required to drain storm water from the watershed described in figure below. Use rainfall intensity = 4 cm/hr. Average velocity of flow is 1 m/s. Other data are for: Area 1: C=0.5, area=0.005 km2. Area 2: C=0.4, area =0.01 km2. Area 3: C=0.7, area=0.015 km2.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.
- 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)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.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.
- Find runoff R in cm.Determine the peak runoff (Nearest whole number) from a 100-year storm for the watershed described below: Field 1: 192 acres, 2% slope, cultivated, sandy soil Field 2: 38 acres, 8% slope, pasture, tight clay soil Field 3: 40 acres, 11% slope, woodland, silt soil The drainage way is 4000 feet with a 0.1% slope.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.
- Subject: Hydrology Give me right solution Determine the 10-year period peak runoff for 80 hectare watershed having a runoff coefficient of 0.4. The maximum length of flow of water is 610 meters and the fall along this path is 6.0 meters. The rainfall intensity for that return period is 101.25 mm/hr having duration equal to the time of concentration.The ordiantes of a 6h-UH of a watershed having a drainage area of 393 km^2 are given below. For a storm over the watershed having excess rainfall of 5cm for the first six hours and 15cm for the second six hours, compute the direct runoff hydrograph ordiantes and plot the hydrograph. (List all the DRH ordiantes in order)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.