Weekend Warrior

01:32PM | 11/30/02
Member Since: 11/29/02
106 lifetime posts
The house I just purchase is 100+ yrs old, with no gutters. We have not had an extremely wet fall, yet my sump pump (which pumps the water into the back yard)runs every half hour or so. My theory is that the rain we do get, makes it's way into the basement only to be pumped out to the yard. Once the yard is saturated, the water just seeps back in to the basement and the whole cycle starts over again.

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.


02:23AM | 12/04/02
There are more determining factors than just the square footage of the roof. Other variables that need to be taken into consideration are:

  • Type of soil the drain will be installed in and how well water can percolate into it.
  • The amount of rainfall that can be expected in you geographical location.
  • How much water will be pumped into the system. (How high is the water table in relation to your basement?)

The addition of one or more drywells in the drainage system can also be a big help. (Especially if one area will percolate better than the rest.) If you need step-by-step instruction on the construction of a dry well including illustrations, or need to calculate the amount of stone needed for you drainage system, etc. you can contact me through the “Expert Advice” section of this website and I will send you what you need. There is a minimal fee involved for this service but I cannot send the information through this bulletin board.


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