Downspout through sidewalk5/27/2023 Plus, since the Corex is flexible, unlike PVC, there is the option to steer around any obstacles. I went with non-perforated because I don't want any tree roots clogging it up and I'm not worried about picking up any groundwater. Is cheaper than PVC, and easier to transport, I transitioned to that shortly after the arms of my Y met up. I settled on this design because I wanted as few angles as possible, so that any speed the flowing water picked up would not be slowed down by making a 90 degree corner. My plan was to use 4" PVC pipe, with fittings, to make a Y-shape away from the house. Water flows downhill so you have to have some amount of slope so the water will run somewhere. ![]() While the house sits on flat ground, there is enough slope in the back yard for this project to work. I wanted a good way to get rainwater from the roof as far away from the house as possible. ![]() Before installing gutters, rainwater from the roof fell to the ground and didn't flow anywhere before soaking in to the soil - hence, large spring rains lead to water in the basement. The house sits in the front half of the property, which is flat. ![]() ![]() The rainwater from the back half of the property slopes down to the alley, which has a storm sewer.
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