Precipitation : Hydrology MCQ Practice Questions & Answers (Tamil) - ObjectiveMcq

Precipitation in Hydrology : Practice MCQ Questions & Answers with Explanations

3 practice sets · Page 1 of 1

HydrologyEasyPrecipitation

a mean annual runoff 1 m3/s from a catchment of area 10 km2 represents an effective rainfall of

10.0 cm

315.4 cm

100 cm

31.54 cm

150 cm

Correct Answer:

(B) 315.4 cm

Explanation:

Given: Runoff = 1 m3/sec Catchment area = 10 km2 Calculations: Effective rainfall = $\frac{Mean\;Annual\;Rainfall}{Catchment\;Area}$ Mean Annual Rainfall = 1 m3/sec Ã— 365 Ã— 24 Ã— 60 Ã— 60 Catchment Area = 10 km2 = 10 Ã— 106 m2 Effective rainfall = $\frac{{1 \times 365 \times 24 \times 60 \times 60 }}{{10 \times {{10}^6}}} =3.1536\;m= 315.4\;cm$

HydrologyMediumPrecipitation

The area between the isohytes 0.45 m and 0.55 m is 100 Sq.km and between 0.55 m and 0.65 m is of 150 Sq.km. The average depth of annual precipitation over the above basin of 250 Sq.km will be

0.50 m

0.55 m

0.56 m

0.60 m

1.0 m

HydrologyMediumPrecipitation

Consider the factor affecting the evaporation losses:

The rate of evaporation increases as the wind speed decreases.
The rate of evaporation decreases with the increase in atmospheric pressure.
The rate of evaporation increases with an increase in salt concentration in water.
The rate of evaporation increases as the saturation vapor pressure increases.

Choose the incorrect statement:

1, 2

2, 3

1, 3

2, 4