Go to your local NRCS office and ask for them to design it for you. ie primary spillway pipe size, pool level, emergency overflow height and size, watershed calculations, yards of fill needed etc, etc. The acreage of the lake needs to be suitable to the watershed acreage.

They will probably tell you to core a minimum of 3' below the current creek floor, and deeper if required to get to good clay. The core should extend up to the top of the dam with the exception of topsoil on top to grow grass. The core will need to extend into the hillside to good clay.

Last edited by Redonthehead; 01/04/19 05:54 PM.

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