Section 4: Soil and Water Conservation Engineering
Gully Control and Drop Spillways
Subtopic: Gully Control and Drop Spillways
Question Statement:
Anti-seep collars installed around the conduit barrel of a drop inlet pipe spillway serve to:
Options:
(A) Increase the seepage flow path along the outside of the pipe barrel by at least $15\%$ to prevent piping and washouts
(B) Prevent pipe thermal contraction
(C) Increase water velocity inside the barrel
(D) Filter sediment from entering the barrel
Answer Key:
A
Step-by-Step Solution & Explanation
Anti-seep collars project into the compacted embankment to interrupt preferential seepage lines and prevent failure by piping along the smooth barrel exterior.