Storm Drain Plus Grey 39.5′ channel with grate assembly. Storm Drain Water Management System Plus is a long lasting, permanent solution of the removal of standing surface water. The easy installation is ideal for driveways, pools, patios, walkways, sports courts, and more. All products are UV (ultraviolet) inhibited. Grates are ADA (Americans with Disabilities Act) and heel guard compliant. No clips or screws required to assemble.