I plan to install gutters next spring and rout the downspouts into a perforated drain pipe system out further into the yard.
My question is this: Where can I find resources to determine the specs of this system- i.e. Calculations for the amount of rainwater shed per sq ft of roof, the total footage of the system req'd, will I need a catchbasin, etc. I would also like to attach the sump pump outlet to this system- the amount of which, I am hoping will be greatly reduced due to the gutters/drainage.
I am quite sure the size of the suystem is based on the sq footage of the roof. I know I will need to maintain a 1/4" per 1'-0" slope, be below frostline, use filter fabric and stone, etc.
Any help would be greatly appreciated.