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PERMEABLE PATIO By Timothy Grant, Grant and Power Landscaping T BEFORE Top: The homeowners had exceeded the city's maximum non- permeable limit for their property, so in addition to building a permeable patio, the contractor also removed 100 square feet of driveway and replaced it with landscaping fortified with shredded-bark mulch and mushroom compost. Above: At the beginning of the project, the contractor had to remove the dead tree that was causing a retaining wall to fall. Also, the existing patio was sinking and had to be torn out and replaced. 28 LC DBM he homeowners of this Glen Ellyn, Illinois project approached Grant and Power Landscaping for a small permeable patio addition, as well as to fix huge drainage issues after the own- ers learned they were in a flood plain. During inspection, the contractor discovered that the existing paver patio was sinking, and its retaining wall was failing as well. Also, the home had a serious standing water issue in the back yard due to poor grading. The contractor designed and installed a drainage system to handle all of the home's down-spouts, as well as installing a number of the pumps. Once they re- moved the sinking patio, they designed and installed a permeable paver patio that drains to a dry creek bed the contractor built into the side yard. According to the contractor, all of the design work had to be signed off by The Village engineer in Glen Ellyn. The project was approved and the engineer loved the approach. Design Process The company designer used Dynascape software to create the project design and The Village required the contractor to hire an engineer to design the schematic. After the design was completed, the company had to submit it to The Village for a permit; the entire permitting process took two months. Construction After the existing patio and retaining wall was removed, the contractor exca- vated for the patio, retaining wall and cut for drainage. They excavated down to