We are in the process of replacing our discharge line from our sump pump out into the back yard. However, instead of being able to discharge the washer water and ground water out to the wooded area in back, we now have to route it to a drywell. How big should the drywell be? What type of material is used to make a drywell? Thanks. Would you e-mail me direct at genelka@aol.com please? Thanks.

Gene Kalika