Looking to construct a 1 acre pond with a 9 1/2 acre watershed that is primarily ground water fed. The pond will be mostly excavated, with a low wide damn needed on the lower end of the slightly sloping yard. Dam will be approximately 4 foot above grade and 20 feet wide with a 2 foot free board.
Thinking of utilizing 6 inch schedule 40 PVC that transitions into smooth wall corrugated beyond the dam area. Drain pipe will enter the water about 2 feet below normal surface level. see the attached picture please. Gate valve would be installed to service and adjust the drain, male/female screw union for future adjustments of height of drain, and clean out plug if I ever needed to lower the level by 2 feet or so Or for direct access to remove debris.
Comments welcome on this design, also tables seem to indicate that 6 inches would be fine for drain but opinions valued here as well. I will be installing an emergency overflow. Thanks
