well is sunk through an unconfined aquifer and is pumped at a constant rate. The draw-down in he observational wells are measured and the following data is generated Static water denth 20m

Structural Analysis
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Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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he peak of flood hydrograph due to a 3-h duration isolated storm in a catchment is 270m/s. The
total depth of rainfall is S.9 cm. Assuming an average infiltration loss of 0.3 cm/h and a constant
base flow of 20 m'/s, estimate the peak of the 3-h unit hydrograph of this catchment. If the area of
the catchment is 567 km, measure the base width of the 3-h unit hydrograph by assuming it to be
triangular in shape.
Graph a complex hydrograph for the following data given in Table 13,
Take R1/R2 = 1.2 and R1/R3 = 1.5
Time
10
11
200
400
1000
2800
1400
700
480
200
A well is sunk through an unconfined aquifer and is pumped at a constant rate. The draw- down in
the observational wells are measured and the following data is generated
Static water depth 20 m
Q 0.025 m'/s
Dia. of well 15 m
Drav down at 7.5 m1.26 m
Draw down at 15.0 m =0.84 m
Quantify the followings
The coefficient of permeability,
The diameter of circle of intluence, an
The drawdown in the well.
%3D
Transcribed Image Text:he peak of flood hydrograph due to a 3-h duration isolated storm in a catchment is 270m/s. The total depth of rainfall is S.9 cm. Assuming an average infiltration loss of 0.3 cm/h and a constant base flow of 20 m'/s, estimate the peak of the 3-h unit hydrograph of this catchment. If the area of the catchment is 567 km, measure the base width of the 3-h unit hydrograph by assuming it to be triangular in shape. Graph a complex hydrograph for the following data given in Table 13, Take R1/R2 = 1.2 and R1/R3 = 1.5 Time 10 11 200 400 1000 2800 1400 700 480 200 A well is sunk through an unconfined aquifer and is pumped at a constant rate. The draw- down in the observational wells are measured and the following data is generated Static water depth 20 m Q 0.025 m'/s Dia. of well 15 m Drav down at 7.5 m1.26 m Draw down at 15.0 m =0.84 m Quantify the followings The coefficient of permeability, The diameter of circle of intluence, an The drawdown in the well. %3D
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