I am about to have a new patio installed and there are two gutter downspouts that will dump onto the patio. I already have a problem with water going into my crawlspace, but it has been suggested that once I put in a patio and slope it away from the house, the water into the crawlspace should stop. Should I have the downspouts run into PVC pipe under the cement? and if so, won't that cause problems later on (clogging, etc.). Please help. I do not want to pay to have this big patio installed and still end up with problems.