Duluth UDC § 1115.05

1. Residential Drainage Plans, when required (see 909.02), must meet the following requirements: Residential Drainage Plans (RDPs) shall be drawn to scale on a certified boundary survey of the lot prepared by a Registered Land Surveyor, having an error of closure not exceeding one in 5000 feet. The Residential Drainage Plan may be combined with a House Location Plan if both are required for the lot. 2. Residential Drainage Plans shall show the following as applicable: a. Boundary lines of the lot, giving distances to the nearest one-tenth of a foot and bearings to the nearest minute. b. Location and names of all abutting streets or other rights-of-way. c. The outline of all buildings, driveways, parking areas, swimming pools, recreational courts, patios, accessory structures and other improvements existing or proposed on the property, including dimensions on all improvements and distances of each to nearest property lines. d. All easements, public water, sewer or storm drainage facilities traversing or located on the property, and septic tank and drain field, if any. e. Subdivision name, lot designation, land lot, and district. f. North arrow and scale. g. Contour lines based on sea level datum. These shall be drawn at intervals of not more than two feet and shall be based on a field survey. Proposed grading of the lot shall be shown along with the finished floor elevation of the lowest habitable floor of the house. h. Stormwater features, including swales, pipes, stormwater detention and other structures, all drainage easements and directions of flow. i. Floodplain features, including the limits of the flood hazard area, 100-year flood high water elevation, origin of the floodplain data, and any proposed modifications to the floodplain limits. j. Sedimentation and erosion control measures to be taken or placed on the lot during construction. k. Names, addresses, and telephone numbers of both the owner of the property and person preparing the Residential Drainage Plan. l. Seal, registration number, and date of expiration of the Professional Engineer or Landscape Architect who prepared the drainage improvements or modifications shown on the Residential Drainage Plan. 3. A Residential Drainage Study (RDS) shall be conducted by the developer’s or builder’s design professional prior to issuance of a Certificate of Occupancy on those lots so noted on the Final Plat. The grading and construction of the lot shall be field verified by the developer’s or builder’s design professional as being in conformance with grading plans and stormwater management studies approved for the subdivision prior to issuance of a Certificate of Occupancy. 4. A Certificate of Occupancy shall not be issued for the structure until a written certification has been received from the developer’s or builder’s design professional stating that the provisions or improvements required by the Residential Drainage Plan or as a result of the Residential Drainage Study have been verified in the field. 5. If an RDP or RDS is required because a stream or floodplain is on or adjacent to the lot, the notation on the development plans and plat should be “RDP-E” or “RDS-E” as appropriate.