The ordinates of the hyetograph of a 6-hr duration rainfall is given below. If the direct runoff is 33 mm, estimate the D-index in mm/hr. Time (hr) 0 Rainfall intensity (mm/hr) 0 007 3 08 ) 10 20040 1 2 7 18 3 25 14 5 6 10 3 12

Q: The following are basic assumptions about the rational method except: O Rational coefficients are…

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Q: Determine the direct runoff, the D-index, and the excess rainfall hyetograph for the storm given…

A: DRH=Direct runoff hydrograph we have to determine ϕ-index here and excess rainfall for the…

Q: 9.24 The rainfall excesses derived from the weighted-average daily rainfall in a basin are indi-…

A: Given,

Q: a. Derive a 2-hour Unit Hydrograph for a Watershed Area of 2600 acres. The total 2 hour rainfall was…

A: Watershed area = 2600 acres2 hr rainfall = 6 inrunoff for first two hours = 0.8 in = 2.032…

Q: The rainfall intensity or each 30 minute period are given below for a storm. The basin area is 5…

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Q: 4. Given the following 2-hour unit hydrograph, determine the peak direct runoff rate (in cfs)…

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Q: B: (3 Points) A catchment area 0.25 km is subjected to a storm with the following table. If the…

A: Finding runoff and precipitation depth first then phi index

Q: The hyetograph rainfall event of 3 cm. in the figure corresponds to a

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Q: Q2) The hourly rainfall intensity data during a storm are as follows 01 2 3 45 6 7 89 10 Time (hrs)…

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Q: For a 14 hours storm, accumulated rainfall is given below. Time (hours) 02 4 6 8 10 12 14…

A: For a 14-hour storm,

Q: Time distribution of a rainfall- for situation 2 Time, h Cumulative Rainfall, cm O to 1 0.7 1 to 4…

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Q: The 4-hr rainfall for successive 30 minutes intervals is as shown below. If the surface runoff is 6…

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Q: Q2) Use the 1-h Unit Hydrograph tabulated below to predict the total flood hydrograph that would be…

A: It is required to find the flood hydrograph from the resulting DRH.

Q: The mean rainfall over a catchment is presented in 20-min time intervals. If th what are the runoff…

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Q: A gage on a small (0.75-acre) urban parking lot recorded the following incremental rainfall data.…

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Q: The hyetograph in the figure corresponds to a rainfall event of 3 cm. Rainfall intensity (mm/hour) 0…

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Q: Intensity (cm/hr) 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 0.2 0.4 0.6 Time (hr) 0.8 1

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Q: Time 1 123 4 5 6 7 8 9 10 11 12 Runoff (cfs) 130 170 300 600 696 727 602 512 315 210 90 60 Base flow…

A: TimeRunoff (cfs)Base flow (cfs)DRH ordinates(cfs)1 hr UH(i)1 hr UHlagged by 1 hr(ii)sum of (i) &…

Concepts of Flood Control

Flooding is a temporary overflow of water that submerges or covers the the usually dry land. It can also be defined as the overflow of the excess amount of water that covers a huge area of land which is normally dry.