I am working on project which bound by a swale on one side (which cannot be used to drain this site) and a river. My problem is that I can only drain the site to the river which is located 45 feet from the nearest catchbasin. The ordinary high water mark (OHWM) for the river is 7.42', the top of my catchbasin is 11.5'. With 2' cover at the catchbasin for the lead and an 18" dia. lead at 1% I will be approx. 6" above the OHWM. In addition I also have to install a stormceptor before discharging in the the river. Does anybody have comments or suggestions?
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