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.
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.
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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