Section A
Q1. Answer each of the following :
(a) What are the main causes of soil erosion in India? Explain the agronomic practices adopted for controlling the soil erosion.
(b) What are the contour and graded bunds? How do they differ in design and functional aspects?
(c) Let P1, P2, P3, \dots, Pn be the depths of rainfall recorded in n rain gauges enclosed by polygon having areas A1, A2, A3, \dots, An within the watershed. Calculate the average depth of rainfall (P) in the watershed of area A.
(d) Calculate the cross-section of a contour bund used to store 24-hour excess rainfall of 10 cm. The annual rainfall is about 120 cm with a high intake rate and there is low coverage of crops over the land. The land slope is 4%. Use Cox's formula for VI of contour bund.