. I want to design a detention pond, where should I start? The flow into pond is 1.4m3/s, the existing SW system near the pond is 600 dia pipe. If I calculate the disharge through the pipe using Mannings formula, the max capacity is 1.8m3/s, using the orifice formula for 600 dia pipe it is only 0.5m3/s. So which one should I use? Because if it is orifice one I will need to allow for 3m head water
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