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Surface drainage

Which of the following is the maximum slope for a grassed area?
A. 0.5%
B. 2%
C. 2-10%
D. 25%
E. 50%
F. none of the above
AnswerD. 25%. 0.5%=min. for surface drainage, 2%=proper slope away from building, 2-10%=range for drainage ditches, 50%=max. for stable soil with surface cover(rocks, ivy...)

ARE 4.0 exam prep: SPD

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