B) The rates of rainfall for the successive 30 min period of a 3-hour storm are: 1.6, 3.6, 5.0, 2.8, 2.2, 1.0 cm/hr. The corresponding surface runoff' is estimated to be 3.6 cm. Establish the -index and its coefficient of runoff.
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- 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 Ødetermine φ index and time of rainfall excess given surface runoff as 9.3 cm for a nine-hour storm event.A 6 hour storm has 6 cm of rainfall and the resulting runoff was 3 cm. if the phy index remains at the same value, which one of the following is the runoff due to 12 cm of rainfall in 9 hours in the catchment?
- 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?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.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.
- 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.A catchment area of 10 acre consists of 25% high traffic urban paved area with Rv of 0.97, 25% connected flat roof with Rv of 0.83, and 50% silty soil with Rv of 0.11. When 85% percentile of 24-hr precipitation is 0.6 inch, what is the runoff volume based on small storm hydrology method? Select the closet answer. 2Subject: 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.
- 8. A basin is divided by 1-h isochrones into four sub-areas of size 200, 250, 350 and 170 hectares from the upstream end of the outlet respectively. A rainfall event of 5-h duration with intensities of 1.7 cm/h for the first 2 h and 1.25 cm/h for the next 3 h occurs uniformly over the basin. Assuming a constant runoff coefficient of 0.5, estimate the peak rate of runoff. (An isochrone is a line on the catchment map joining points having equal time of travel of surface runoff)The recent monsoon rains have posted a nearly uniform rainfall intensity of 30 mm/hr over a 1,500-hectare watershed area in Central Luzon. If the runoff coefficient is 0.15, what is the runoff rate in m^3/sec acre-inch/hr ft^3/secIn a typical 3 hours storm producing 60 mm runoff from a basin and its flow ordinate are presented below estimate the peak flow and its time of occurrence in a flood created by 6 hours storms which produces 30 mm of the runoff during the first 3 hours and 45 mm runoff during the second 3 hours. plot the flow hydrograph