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TO: The Honorable: Members of DATE: May 6, 1986 FILE: the Board of County Commissioners DIVISION HEAD CONCURRENCE SUBJECT: AMENDMENT TO REGULATE Robert M. Keati g, CP STORMWATER DISCHARGE FROM Through, Michael K. Miller MXM SINGLE-FAMILY LOTS Chief, Current Development FROM: Stan Boling ,,4,,6, REFERENCES: stormwater Discharge Staff Planner STAN3 It is requested that the following information be given formal consideration by the Board of County Commissioners at their regular meeting of May 21, 1986. DESCRIPTION & CONDITIONS: At their October 31, 1985 public joint meeting, the Board of County Commissioners and the Planning & Zoning Commission reviewed and discussed a proposal to amend the Zoning Code to regulate stormwater discharge from single-family lots. After consideration of the proposal, the Board of County Commissioners directed staff to advertise public hearings of the -Commission and the Board for the adoption of the proposed amendment. Staff has prepared the amendment, incorporating a change suggested by the Board and Commission at the October 31st meeting, and including more specific criteria by which the Public Works Director will determine approval/disapproval of required con- ceptual drainage plans. At their regular meeting of February 13, 1986 the Planning & Zoning Commission voted 3 to 0 to recommend to the County Commission that the proposed amendment to regulate stormwater discharge from single-family lots be adopted. At a February 20th joint workshop, the Planning & Zoning Commission asked and received permission from the Board of County Commis- sioners to workshop the proposed amendment prior to formal Board consideration. An advertised and noticed workshop was held on April 18, 1986. The conclusion of the workshop was to bring the ordinance before the Board of County Commissioners for adoption. ALTERNATIVES & ANALYSIS: The County via complaints from homeowners adjacent to newly constructed homes, has recognized the need to address drainage problems on single-family lots for which no subdivision positive stormwater system has been provided or constructed. Drainage problems usually occur when newer houses are built in older subdivisions two to four feet higher than existing adjacent homes. Disparities in floor elevations of newer and older homes have increased in the last year. State regulations adopted in February of 1985 now require that septic tanks and drainfields be 12" higher above the wet season water table than previously required. In some areas, newer flood insurance requirements can cause disparities in building pad elevations as well. The proposed ordinance would address these problems by requiring approval of conceptual drainage plans as part of the normal building permit review for single-family home construction on certain single -;Family lots or parcels. The drainage plan would be included in the building plot plan or parcel survey. Much of the information required on the plan is already provided in septic tank permit applications. The ordinance would also require that any drainage improvements shown on an approved conceptual plan shall be provided, constructed and inspected prior to the issuance of a Certificate of Occupancy for the residence. 51 MAY 2 ] 1966 BOOK ' CA,t 5"