8. Determine the peak runoff rate in Ashville, NC, for a 25-year storm of a 50-acre watershed with 22 acres of Residential (12,000 sf lots), 12 acres of Apartments, 6 acres of Lawn, and 10 acres of Forest? The length of flow is 1200 feet and an elevation drop of 150 feet.
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- please show steps and explain If the rainfall excess consists of two bursts of 3.3 in./hr and 1.8 in./hrs, each for 20 minutes, and the 20-minute UH (1”) hasordinates of 15, 40, 25, and 10 ft3/s, compute the distribution of direct runoff.A 6-hour rain of average intensity 2 cm/hour falls over the fern leaf type catchment as shown in Figurebelow. The time of concentration from the lines AA, BB, CC and DD are 1, 2, 3 and 4 hours,respectively, to the site 0 where the discharge measurements are made. The values of the runoffcoefficient C are 0.5, 0.6, and 0.7 for the 1st, 2nd and 3rd hours of rainfall respectively and attain aconstant value of 0.8 after 3 hours. Draw surface runoff hydrograph from the runoff collected from thecatchment and also calculate volume of direct Runoff.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
- A 4-hour rain of average intensity I cm/hr. falls over the fern leaf type catchments shown in Fig. below. The time of concentration from the lines AA. BB, CC and DD are 1, 2, 3and 4 hours, respectively, to the site 0 where the discharge measurements áre made. The value of the runoff coefficient C are 0.5, 0.6, and 0.7 for the 1st, 2nd and 3rd hours of rainfall respectively and attains a constant value of 0.8 after 3 hours. Determine the discharge at site O and draw the discharge hydrograph at O?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 ØAn urban park has a drainage basin area of 398 ac. The 25-year rainfall event has a precipitation intensity of 2.382 in./h. If the C factor is 0.75, what is the maximum rate that overland flow will drain from the urban park?
- If fo = 0.7 in./hr, fc = 0.2 in./hr, and K = 0.5 hr-1, determine the distribution of losses and the depth of rainfall excess for 2-hour storm with intensity of 1.3 in/hr.determine φ index and time of rainfall excess given surface runoff as 9.3 cm for a nine-hour storm event.A 6-h storm had 6 cm of rainfall and the resulting runoff was 3.0 cm. If the pindex remains at the same value the runoff due to 12 cm of rainfall in 9 h in the catchment is?
- The rainfall on five successive days on a catchment was 2, 6, 9, 5 and 3 cm. If the o-index for the storm can be assumed to be 3 cm/day, the total direct runoff from the catchment is?Table below gives the time distribution of a rainfall lasting for nine hours. If the direct runoff is 9.3 cm, determine the Ø‐index of the storm and the time of rainfall excess.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.