Wondering about pros and cons of hooded inlet vs, drop inlet.
Referencing the USDA Pond Construction guide it seems as though the only disadvantage of the hooded inlet (straight slanted pipe) compared the the drop inlet ("L" type drain) is you can't easily incorporate a drain. The advantages of the hooded inlet are higher flow, lower cost, and simpler construction.
USDA Pond Design Manual Using the tables in the USDA manual comparing flow (picked 12" dia. smooth pipe and 16 ft head) I get the following:
Hooded Inlet = 12.2 ft^3/s (table 14)
Drop Inlet = 11.1 ft^3/s (table 12)
For the example above It does say you don't get full flow through the hooded inlet until water is 1.35 ft above the inlet and for all the stand pipe flow numbers it says they assume 12" above the crest of the pipe.
Wondering what I'm missing? I'm sure there are earlier posts on this topic but had trouble finding them with the search tool.
I'm new to this forum so thanks for any references to earlier post that discussed this same topic.
