The construction process of subsurface pipe drainage system is in which sequence?
A. Outlet construction
B. Grade control
C. Setting out alignments and levels
D. Excavating the trenches
E. Placing the envelopes
F. Placing the drain pipes
Choose the correct sequence from the options given below:
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Always remember that in any drainage construction, the outlet must be built first to prevent water from ponding in the upstream trenches as they are excavated.