10.2. A catchment with a grass surface has an average slope of 0.8%, and the distance from the catchment boundary to the outlet is 80 m. At the catchment location, the 2-year 24-hour rainfall is estimated as 85 mm. For a 30-min storm with an effective rainfall rate of 70 mm/h, esti- mate the time of concentration using: (a) the kinematic- wave equation, (b) the NRCS method, (c) the Kirpich equation, (d) the Izzard equation, and (e) the Kerby equation.

10.2. A catchment with a grass surface has an average slope of 0.8%, and the distance from the catchment boundary to the outlet is 80 m. At the catchment location, the 2-year 24-hour rainfall is estimated as 85 mm. For a 30-min storm with an effective rainfall rate of 70 mm/h, esti- mate the time of concentration using: (a) the kinematic- wave equation, (b) the NRCS method, (c) the Kirpich equation, (d) the Izzard equation, and (e) the Kerby equation.

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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Q.2 A catchment having an area of 150 km2 has the ø index 0.3 cm/hr. The base flow at the 3 outlet is 10m³/s. One hour unit hydrograph of the catchment area is triangular in shape with a time base of 20 hours. The peak ordinate occurs at 8 hours. If a rainfall of 4.5 cm occurs in 1 hour, then the peak ordinate of the flood hydrograph will be:
i) Based on the unit hydrograph in Table Q4b, construct its S-Curve and develop a 1-hour Unit hydrograph. ii) Based on the unit hydrograph in Table Q4b, construct a new natural hydrograph that can be produced by a series of effective rainfall of 2.5cm, 1.1cm, and 0.3cm that occurred at one-hour intervals between one event and another.
A one-day rainfall of 20 cm at a place X was found to have a period of 100 years. a.) Calculate the probability that a one-day rainfall of magnitude equal to or larger than 20 cm will not occur at station X during the next 25 years b.) Will not occur in the next year