The hyetograph in the figure corresponds to arainfall event of 3 cm.Rainfall Intensity (mm/hour)0124.5151447530.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0Time(hour)If the rainfall event has produced a direct runoff of1.6 cm, the o-index of the event (in mm/hour, roundoff to one decimal place) would be

Given- Rainfall P=3 cmtime t=3.5 hrsRunoff R=1.6 cm=16 mmϕ-index needs to be calculated.

The hyetograph in the figure corresponds to a rainfall event of 3 cm. Rainfall Intensity (mm/hour) 0 12 4.5 15 14 4 75 3 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Time(hour) If the rainfall event has produced a direct runoff of 1.6 cm, the 6-index of the event (in mm/hour, round off to one decimal place) would be

The hyetograph in the figure corresponds to a rainfall event of 3 cm. Rainfall Intensity (mm/hour) 0 12 4.5 15 14 4 75 3 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Time(hour) If the rainfall event has produced a direct runoff of 1.6 cm, the 6-index of the event (in mm/hour, round off to one decimal place) would be

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Analysis of rainfall and runoff records for a certain storm over a basin (of area 3210 km²) gave the following data: Rainfall for successive 2 hr periods: 2.5, 6.5 and 4.5 cm/hr. Direct surface discharge at the concentration point for successive 2-hr periods: 400, 1200, 4500, 7700, 12000, 10220, 8260, 3900, 838 and 400 m’. Derive the unit hydrograph for the catchment area.
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