Stormwater systems shall be designed for a 25-year, 24-hour storm event using the SCS Curve Method as outlined in Stormwater Management Manual for Eastern Washington. Public stormwater systems shall be designed to retain stormwater within approved stormwater appurtenances, and outside of travel lanes. Private stormwater systems shall be designed to retain all stormwater within the originating property. (Ord. 2571, 7/13/10)