4. (a) Consider a land with silt loam. It is clean-tilled and fallowed. Has a slope of 8% and average slope length of 100 m. R= 2550 (from map), K= 0.044 for the same area (from Wischmeier and Smith, 1978), LS =2.3 (high rill/interrill ratio on bare soil), no cover, up-and down tillage down the hill. Estimate soil erosion using ULSE. (b) Consider the same soil as (a) with same R and K values. However, assume that crop rotation is done her and mulch is left in soil. Also, they are planted on the contours with terraces. Hence LS will now reduce to moderate rill/interrill ratio. Estimate soil erosion using ULSE. 12 Low interl sites Moderate interil sites High reri stes 10 10 Skope length • 200 m A 150m 100 O s0m • 25m 10 12 14 16 1S 468 1012 14 16 1S Skpe gradient. 10 12 14 16 1S Slope Skope gradient. S1e ledody

4. (a) Consider a land with silt loam. It is clean-tilled and fallowed. Has a slope of 8% and average slope length of 100 m. R= 2550 (from map), K= 0.044 for the same area (from Wischmeier and Smith, 1978), LS =2.3 (high rill/interrill ratio on bare soil), no cover, up-and down tillage down the hill. Estimate soil erosion using ULSE. (b) Consider the same soil as (a) with same R and K values. However, assume that crop rotation is done her and mulch is left in soil. Also, they are planted on the contours with terraces. Hence LS will now reduce to moderate rill/interrill ratio. Estimate soil erosion using ULSE. 12 Low interl sites Moderate interil sites High reri stes 10 10 Skope length • 200 m A 150m 100 O s0m • 25m 10 12 14 16 1S 468 1012 14 16 1S Skpe gradient. 10 12 14 16 1S Slope Skope gradient. S1e ledody

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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