Sharp crested weirs are generally used
-
for large flows -
for small flows -
for streams carrying high sediment loads -
for rivers carrying floating debris -
none of these.
Indian Meteorological department uses the standard gauges whose collectors have apertures of
-
50 or 100 sq. cm area -
100 or 150 sq. cm area -
100 or 200 sq. cm area -
250 or 500 sq. cm area.
The specifications of most commonly used standard gauges in India, are
-
200 sq. cm collector and 4 litres bottle -
100 sq. cm collector and 2 litres bottle -
200 sq. cm collector and 10 litres bottle -
100 sq. cm collector and 4 litres bottle.
Pick up the correct statement from the following :
-
The ratio of total volume of voids in soil aggregates to the total volume of aggregate, is called Porosity -
Water retained by the interstices due to molecular attraction, is called pellicular water -
The ratio of volume of water obtained by gravity drainage to the total volume of the materials drained, is called 'yield' -
Sum of the percentage of specific yield and specific retention is 100 -
All the above.
The run off is affected by
-
size of the basin -
shape of the basin -
elevation of the water shed -
all the above.
The equation P - Q = Te φindex for determining the infiltration capacity, was suggested by
-
Horton -
Horner -
Llyod -
Bernard.
According to Thiem, the permeability of an aquifer may be obtained from the equation
-
-
-
-
-
all the above.
Pick up the correct statement from the following :
-
The ratio of total volume of voids in soil aggregates to the total volume of aggregate, is called Porosity -
Water retained by the interstices due to molecular attraction, is called pellicular water -
The ratio of volume of water obtained by gravity drainage to the total volume of the materials drained, is called 'yield' -
Sum of the percentage of specific yield and specific retention is 100 -
All the above.
According to Thiem, the permeability of an aquifer may be obtained from the equation
-
-
-
-
-
all the above.
If the viscosity of ground water is 1.the Slitcher's constant isthe effective size of soil particles in acquifer is 0.5 mm and hydraulic gradient is 1 inthe velocity of flow is
-
0.25 m/day -
0.50 m/day -
0.75 m/day -
1.00 m/day -
1.25 m/day.
Run off is measured in
-
cubic metres -
cubic metres per sec. -
cubic metres per minute -
cubic metres per hour.
Izzard formula for the time of concentration in minutes for the plots having no channels, is (where Lo is the length of overland flow in metres and Kp rainfall intensity in cm/hour)
Izzard formula for the time of concentration in minutes for the plots having no channels, is (where Lo is the length of overland flow in metres and Kp rainfall intensity in cm/hour)
Izzard formula for the time of concentration in minutes for the plots having no channels, is (where Lo is the length of overland flow in metres and Kp rainfall intensity in cm/hour)
Run off is measured in
-
cubic metres -
cubic metres per sec. -
cubic metres per minute -
cubic metres per hour.
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.the evaporation loss is
-
2 mm -
4 mm -
6 mm -
6 mm.
When a constant discharge 2.litres/sec. was obtained in a pumping test, the draw downs in the test wells at 3 m and 6.m were 2.6 m and 0.3 m respectively. If over-all depth of the pumping well wasm, the permeability of the soil, is
-
0.0005 cm/sec -
0.001 cm/sec -
0.002 cm/sec -
0.01 cm/sec.
Pick up the correct statement from the following :
-
Yield of a drainage basin is the run off at any time -
Yield of a drainage basin is the run off over long periods -
Yield of a drainage basin is expressed as surface run off per year -
Run off is expressed as total volume per day -
None of these.
The form factor of a drainage basin is obtained by dividing
-
area of the basin by the axial length -
average width of the basin by the axial basin -
area of the basin by the square of the axial length -
both (a) an (b) -
both (b) and (c).
Dicken's formula for high flood estimate, is useful only for the catchments in
-
Southern India -
Northern India -
Eastern India -
Western India.
Run off includes
-
precipitation over catchment area of the stream and its attributaries -
surface run off -
ground water flow -
all the above.
If s is the potential infiltration, P is rainfall in cm in a drainage of a soil with fair pasture cover, the direct run off Q in cm is given by
Sharp crested weirs are generally used
-
for large flows -
for small flows -
for streams carrying high sediment loads -
for rivers carrying floating debris -
none of these.
The rational formula for calculating the discharge, is (where A is the area of basin and Po is one hour rainfall)
The time required by rain water to reach the outlet of drainage basin, is generally called
-
time of concentration -
time of overland flow -
concentration time of overland flow -
duration of the rainfall -
none of these.
Izzard formula for the time of concentration in minutes for the plots having no channels, is (where Lo is the length of overland flow in metres and Kp rainfall intensity in cm/hour)
Isohytes are the imaginary lines joining the points of equal
-
pressure -
height -
humidity -
rainfall.
If ω is unit weight of water, Q the discharge in cumecs, H the total head lift and η, the efficiency of the pump, the H.P. of the motor is
The equation P - Q = Te φindex for determining the infiltration capacity, was suggested by
-
Horton -
Horner -
Llyod -
Bernard.
In the estimate of design flood, Dickens assumes that high flood in cumecs, is proportional to catchment area raised to the power
