Clark County: Clogged Street Drains-“Who you gonna call?” Heavy autumn rains frequently pose additional challenges due to fallen leaves that clog street drains. Property owners can help prevent flooding by removing leaves from areas that could block storm drains. If backups occur, though, residents shouldn’t try to unclog the drains themselves, because they might damage filters inside the drains. Report clogged storm drains and other flooding concerns to the Public Works Department by calling (360) 397-2446.