The rainfall during three successive 2 hour periods are 0.5, 2.8 and 1.6 cm. The surface runoff resulting from this storm is 3.2 cm. The index value of this storm is
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- 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.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?The volume of runoff is lesser for the intense storm comparing with gentle rain even though the precipitation totals for the two rainfall events are the same. Select one : True False
- 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.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/secThe peak runoff in an 90 ha watershed corresponding to a rainfall intensity of 25 mm/hr and a runoff coefficient of 0.65. Find the peak runoff.
- 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?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?
- In a particular season a catchment was found to have phi index of 0.3 cm/hr. If a rainfall of 3 cm occur in the season at uniform rate in a 12 hr storm,what will be the resulting direct runoff.In 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 hydrographDuring a storm event in a certain period, the rainfall intensity is 5.5 cm/hour and the - index is 3.5 cm/hour. The intensity of effective rainfall (in cm/hour up to one decimal place) for this period is