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. Mon th 1 2 3 4 5 6 7 9 10 11 12 1.5 0.8 0.6 2.1 8.0 18.0 14.0 9.0 7.0 3.0 Gaug e flow (Mm 3) 2.0 00 8 22.0

Fundamentals of Geotechnical Engineering (MindTap Course List)
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Chapter7: Seepage
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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.

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.
Mon
th
1
2
3
4
5
6
7
8
9
10
11
12
Gaug
e
flow
1.5
0.8
2.1
8.0
18.0
14.0
9.0
7.0
(Mm
3)
2.0
0.6
22.0
3.0
Transcribed Image Text: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. Mon th 1 2 3 4 5 6 7 8 9 10 11 12 Gaug e flow 1.5 0.8 2.1 8.0 18.0 14.0 9.0 7.0 (Mm 3) 2.0 0.6 22.0 3.0
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