Ryve's formula for flood estimate in cumecs, is

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

Dicken's formula for high flood estimate, is useful only for the catchments in

If the loss due to friction in pipes is 4 m, the total losses in strainer and bends may be taken as

The rate of evaporation from reservoirs may be determined by

If h is the loss due to friction in a pipe. Total losses in strainer and bends may be taken as

When a constant
discharge 2.91 litres/sec. was obtained in a pumping test, the draw
downs in the test wells at 3 m and 6.184 m were 2.6 m and 0.3 m
respectively. If over-all depth of the pumping well was 16 m, the
permeability of the soil, is

Pick up the correct statement from the following :

Isopiastic lines are the contours

The radius of influence is