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Actual second thoughts - would you not use tan (as opposed to Sin)? Please see attachedhttp://files.engineering.com/getfile.aspx?folder=e8fd0135-8573-4378-a9d1-1a5a208017f7&file=rain.pdf

psmart - thanks for that, seems like a sensible figure.

Hello, I am looking at carrying out the draiange design for a multi storey car park. Does anybody know a good method to estimate the rain that might be blown onto the surface of the car park through the sides. Obviously the middle floors in the car park have a roof but the sides are exposed to...

Please see attachment. The problem with Darcy is I have no way of accessing the delta H, ie the change in water level across the trench. If I new this I could calculate Q and everything would be good in the...

Thanks for the responses. Just to confirm the trench will be filled all the way to the top with stone and lined with a membrane to stop soil ingress. I was hoping I could just use mannings and divide the answer by 3 (the stone creates 33% free space within the trench). I thought it might be...

Hello, If I have a drainage trench 600mm x 600mm filled with large stones, assuming a porosity of 0.33 and a gradient of 1/200 what is the best way to caculate the conveyance capacity in l/s. In other words what is the maximum flow rate the trench can pass downstream to the outfall. I would...