Effective Immediately, the Building Construction Division will no longer require drainage plans and drainage as-built surveys for detached sheds and garages so long as the existing conveyance or swale along the side and rear of the property is not diverted or blocked. These structures will still be required to have the final grade slope a minimum of 6 inches within the first 10 feet of the building to comply with the Florida Building Code, Residential, Section 401.3, unless provided with an exception.