Hello, I'm a Structural Engineer, but I have to do a storm water detention calculation for one project and I'm not sure how to calculate the actual release rate at the manhole prior to connection to the main sewer line. I'm using a 4" DIP pipe restrictor. I considered Manning's modified formula Q=A*1.486/n*R^(2/3)*S^(1/2) and also flow resulting from gravity pressure Q=Co*Dr^2/4*(pi)*(2*g*H)^(1/2) Can anybody tell me how to determine how much water will restrictor release. I'm also using about 6" surface storage in the form of a volume of cone frustrum and I assume that at the design storm (100-years 24-hour) underground storage (oversized pipes) as well as surface storage will be full. This should give me minimum required underground storage volume. Your input is very much appreciated. Thank you.
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