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Field Correspondent Lunker
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Matt and rainman are correct it is original streambed and/or highest to lowest. This means you have to consider slope of dam on backside. If say on a 3:1 and 18 feet tall you have to measure elevation at lowest point 54 feet below center of dam. Where you have elevation changes like we do in North Ga this will add several feet as well. Hope I explained that well. The reason I know this is that we planned a dam for client only to findout about this. The creek dropped over 8 feet in elevation not far behind the dam, we had to move it up to not get in this rapid change and stay under the 20 feet requirement.
In GA it also is considered a class one dam if potential loss of life if the dam wwer to breech. Out in the country no biggie in metro Atlanta with school downstream good luck with that enginerring.
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