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MAY 21 1986 BOOK 64 F,9G F 509 The effect of the ordinance would be that persons applying for permits to build single-family homes on lots or parcels not located in a subdivision with an approved positive stormwater system would be required to do one of two things: 1. provide a conceptual drainage plan showing that stormwater discharged from the lot after construction of the home will be adequately handled without further' - improvements; or 2. provide a conceptual drainage plan showing that existing conditions and to -be constructed improvements (including swales) will adequately handle stormwater discharge from the lot after the home is constructed. Such drainage improvements will be provided and inspected prior to issuance of a Certificate of Occupancy. Staff has included specific review criteria for the Public Works - Director to use in approving or disapproving conceptual drainage plans. The criteria specify that either the stormwater run-off generated from a 10 year 24 hour storm be retained on the building site or that the run-off be legally routed off site into a maintained drainage system. The permit applicant would have to demonstrate that either existing improvements and proposed grades or proposed improvements (such as swales and/or rain gutters) and proposed grades would be adequately managed. The conceptual plans will not need to be prepared or sealed by an engineer or architect. Staff has determined that, if adopted, appropriate implementing procedures can be incorporated into the existing inter -depart- mental routing/review system. RECOMMENDATION: Staff recommends that the Board of County Commissioners adopt the attached ordinance establishing Section 25(s) Stormwater Discharge from single-family lots. Vice Chairman Lyons asked if we are in a position to handle this, and Planner Boling advised that staff worked with Public Works on this and with Environmental Health. Commissioner Bird inquired about the financial impact in- volved, and Planner Boling explained that a lot of the informa- tion needed is already included with the data required by Environmental Health. There might be some extra surveying work in some situations. Director Keating stated there is some potential cost for preparing and submitting a plan, but if this can be demonstrated by a simple plan, that is fine. The other part involved is actually doing the improvements required to prevent discharge onto abutting properties, and he believed this mainly will just involve grading swales or putting in roof gutters. 52