Hydraulic Drain and Detention Tank

There is a step guide to design detention tanks in PUB COP, but in the step guide using formula for 10 years return period storm, the engineer needs carefully understand and modified few formula to suit return period storm accordingly.

Below are the formulas need to modified if we using 100 years return period storm.

personal data

personal data

For a 100 years return period storm, the coefficient number 8913 to be changed to 12300.

After design according to development area, rainfall intensity and all requirements mentioned above, the detention tanks required to be 25m x 3m x 3m total volume 225m3 and the highest water contained in the tank is 203m3.

So the step procedure in COP needs to be understood carefully and not just follow procedure without knowing the basic understanding behind it.