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Volume of Storm Water Attenuation Tank

Hi;

I am designing storm water network for one project in KSA, Storm water peak flow generated from the site is high value, so we have one alternative to make stormwater attenuation tank. My questions as follows:-

1) How I determine the required volume of this attenuation tank using civil storm of sewergems? 

2) What is the difference between the pond provided in Bentley products and the attenuation tank ?

Kindly if you can provide example or steps to calculate tank volume it will be great help

Regards

Sayed Elhagar