Q4: If the height of the flood hydrograph resulting from a 6-hour rainstorm over a certain mountainous area is 470 m3/s, the average depth of the rainfall is 8 cm, the infiltration losses rate is 0.25 cm/hr and the basal flow rate is constant and is 15 m/s. Find the highest discharge value for a standard 6-hour hydrograph for this mount.

Q4: If the height of the flood hydrograph resulting from a 6-hour rainstorm over a certain mountainous area is 470 m3/s, the average depth of the rainfall is 8 cm, the infiltration losses rate is 0.25 cm/hr and the basal flow rate is constant and is 15 m/s. Find the highest discharge value for a standard 6-hour hydrograph for this mount.

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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A 12 hour rainfall with uniform intensity of 4 cm/hr produces a storm hydrograph of peak discharge 1000 m³/s. The abstractions of rainfall is at the rate of 1 cm/hr and base flow is 30 m³/s. Compute the peak discharge of 12 hour unit hydrograph.
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(i) A catchment experiences a 2-hour duration isolated storm and the peak of the flood hydrograph due to this storm was found to be 220 m³/s. The total depth of rainfall was 47 mm. Estimate the peak of the 2-hour unit hydrograph of this catchment, assuming a constant base flow of 15 m 3/s and an average infiltration rate of 2.5 mm/hr. If the area of the catchment is 445 km², determine the base width of the 2-hour unit hydrograph assuming that the unit hydrograph is triangular in shape.
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1) A 12 hour rainfall with uniform intensity of 4 cm/hr produces a storm hydrograph of peak discharge 1000 m³/s. The abstractions of rainfall is at the rate of 1 cm/hr and base flow is 30 m³/s. Compute the peak discharge of 12 hour unit hydrograph. 2)A hydraulic structure is sized for a 50 year recurrence interval design discharge. What is the risk that the flow capacity will be exceeded during any future 20 year period? What is the probability that the 50 year recurrence interval peak flow rate will be exceeded in the next 50 years?
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