The radius of influence is radius of the main well distance from the wall of mai

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Question
The radius of influence is
Options
A. radius of the main well
B. distance from the wall of main well to the point of zero draw down
C. distance from the centre of main well to the point of zero draw down
D. none of these.

Correct Answer

distance from the centre of main well to the point of zero draw down

Water Resources Engineering problems

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2. In estimating the rate of evaporation from the reservoir surface, a pan 1.5 metres in diameter, was filled upto 8.0 cm. During a specified period of time, the rainfall recorded was 5 cm. 3 cm of water was removed from the pan to keep the depth of water. At the end of the time, the depth was 9 cm. If the pan coefficient is 0.6, the evaporation loss is
Options
A. 2 mm
B. 4 mm
C. 6 mm
D. 6 mm.

5. Boston society of Civil Engineer's formula in cumecs/square km is based upon
Options
A. rainfall and drainage area
B. total run off and drainage area
C. drainage area and its shape
D. drainage area.

6. The respective storm totals at three surrounding stations A, B and C are 110, 90 and 70 mm. If the normal annual precipitation amounts at stations X, A, B and C are respectively 1000, 1100, 1200 and 1250 mm, the estimated storm precipitation at X is
Options
A. 75 mm
B. 77 mm
C. 79 mm
D. 81 mm.

7. Sharp crested weirs are generally used
Options
A. for large flows
B. for small flows
C. for streams carrying high sediment loads
D. for rivers carrying floating debris
E. none of these.

9. Pick up the correct statement from the following :
Options
A. The unit hydrograph of a specified unit duration obtained from the past data can be used to obtain the hydrograph of future storms of like duration
B. To obtain the ordinates of storm hydrograph, the ordinates of unit hydrograph are multiplied by the multiplying factor
C. The multiplying factor for storm hydrograph may be obtained by dividing the run off in mm by 25 mm
D. A tolerance of about 25% of specified duration of unit hydrograph may be accepted without any serious error
E. All the above.

10. Pick up the correct statement from the following :
Options
A. The ratio of total volume of voids in soil aggregates to the total volume of aggregate, is called Porosity
B. Water retained by the interstices due to molecular attraction, is called pellicular water
C. The ratio of volume of water obtained by gravity drainage to the total volume of the materials drained, is called 'yield'
D. Sum of the percentage of specific yield and specific retention is 100
E. All the above.

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