The following table gives values of measured discharges at a stream gauging site in a year. Upstream of the gauging site a weir built across the stream diverts 3.0 Mm3 and 0.50 Mm3 of water per month for irrigation and for use in an industry respectively. The return flows from the irrigation is estimated as 0.80 Mm3 and from the industry at 0.30 Mm3 reaching the stream upstream of the gauging site. Estimate the natural flow. If the catchment area is 180 km2 and the average annual rainfall is 185 cm, determine the runoff-rainfall ratio. Month123456789101112Gauge flow (Mm3)2.01.50.80.62.18.018.022.014.09.07.03.0

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Answered: The following table gives values of…

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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The following table gives values of measured discharges at a stream gauging site in a year. Upstream of the gauging site a weir built across the stream diverts 3.0 Mm³ and 0.50 Mm³ of water per month for irrigation and for use in an industry respectively. The return flows from the irrigation is estimated as 0.80 Mm³ and from the industry at 0.30 Mm³ reaching the stream upstream of the gauging site. Estimate the natural flow. If the catchment area is 180 km² and the average annual rainfall is 185 cm, determine the runoff-rainfall ratio.

Month	1	2	3	4	5	6	7	8	9	10	11	12
Gauge flow (Mm³)	2.0	1.5	0.8	0.6	2.1	8.0	18.0	22.0	14.0	9.0	7.0	3.0

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