) At the beginning of the month of June, water level of a reservoir with surface area of 7km² was at 20m (Refer to reservoir characteristic curve in Figure Qla). Average longterm monthly rainfall for the month of June recorded at five raingages is summarized in Table Q1 (assuming the same average amount of rainfall is also recorded in the reservoir). The inflow to the reservoir X, located at the downstream catchment outfall, resulted from that rainfall can be estimated as Qin =0.65PA where P is mean areal rainfall (to be estimated by Thiessen Polygon) from a 36km² catchment area A, schematically shown in Figure Ib. An average monthly withdrawal of 6MCM from the reservoir is required for water supply purpose. Assume there is no losses from the reservoir except evaporation at 120cm/year. Determine the volume of water required to be pumped into the reservoir in that specific month to achieve a safe operating level at 21m. 80 70 60 50 V = 4.7H - 70 30 20 10 Note: MCM is million m' 10 15 20 25 30 35 Water Level, H (m) Volume, V (MCM)
) At the beginning of the month of June, water level of a reservoir with surface area of 7km² was at 20m (Refer to reservoir characteristic curve in Figure Qla). Average longterm monthly rainfall for the month of June recorded at five raingages is summarized in Table Q1 (assuming the same average amount of rainfall is also recorded in the reservoir). The inflow to the reservoir X, located at the downstream catchment outfall, resulted from that rainfall can be estimated as Qin =0.65PA where P is mean areal rainfall (to be estimated by Thiessen Polygon) from a 36km² catchment area A, schematically shown in Figure Ib. An average monthly withdrawal of 6MCM from the reservoir is required for water supply purpose. Assume there is no losses from the reservoir except evaporation at 120cm/year. Determine the volume of water required to be pumped into the reservoir in that specific month to achieve a safe operating level at 21m. 80 70 60 50 V = 4.7H - 70 30 20 10 Note: MCM is million m' 10 15 20 25 30 35 Water Level, H (m) Volume, V (MCM)
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:(b) At the beginning of the month of June, water level of a reservoir with surface area
of 7km? was at 20m (Refer to reservoir characteristic curve in Figure Qla).
Average longterm monthly rainfall for the month of June recorded at five
raingages is summarized in Table Q1 (assuming the same average amount of
rainfall is also recorded in the reservoir). The inflow to the reservoir X, located at
the downstream catchment outfall, resulted from that rainfall can be estimated as
Qin =0.65PA where P is mean areal rainfall (to be estimated by Thiessen Polygon)
from a 36km² catchment area A, schematically shown in Figure 1b. An average
monthly withdrawal of 6MCM from the reservoir is required for water supply
purpose. Assume there is no losses from the reservoir except evaporation at
120cm/year. Determine the volume of water required to be pumped into the
reservoir in that specific month to achieve a safe operating level at 21m.
80
70
60
50
V = 4.7H - 70
40
30
20
10
Note: MCM is million m'
5
10
15
20
25
30
35
Water Level, H (m)
Figure Qla: Reservoir characteristic curve
Volume, V (MCM)
Transcribed Image Text:Table Q1: Average monthly rainfall
A
Raingauge
A
B
D
Monthly rainfall
in June (cm)
Thiessen polygon
area (%)
10
18
15
8
15
40
33
12
D
Reservoir X
Figure 1b: Location of reservoir at catchment outfall
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