§ 252-71 — Drainage

252-71. Drainage.

1. ROOF GUTTERS AND CONDUCTORS. Except for private detached accessory buildings not more than 1,000 square feet in area, all roofs of buildings and structures shall be provided with approved watertight gutters and conductors for conducting water from roofs as regulated in ch. SPS 382, Wis. Adm. Code. Such gutters and conductors shall be fastened in place in an approved manner and maintained in good repair at all times, and all conductors shall be provided with approved screens. The cross-section of all conductors shall be as regulated in ch. SPS 382, Wis. Adm. Code. 2. DRAINAGE OF PAVED AREAS. a. Newly Paved or Repaved Areas Where Storm Sewers Are Available. All storm water which is generated from a newly paved or repaved area of more than 1,000 square feet, such as a parking lot, terrace or patio area, loading areas or other hard surface, shall be disposed of within the lot lines through a sewer, permeable paving, natural absorption or combination thereof without discharging to adjacent private or public property not specifically designed for this purpose. No such paved or hard surface shall be paved and contoured in such a way as to interrupt a natural drainage system serving adjacent properties. No such paved area shall be paved or contoured in such a way as to impose a greater drainage burden on adjacent property. b. Newly Paved or Repaved Areas Where Storm Sewers Are Not Available. Where no public storm sewer is available or where the commissioner determines that natural absorption, permeable paving, or combination thereof may accommodate all on-site water within the property, the commissioner may allow a drainage system which is not connected to a storm sewer. The commissioner may request soil borings, absorption tests, engineering calculations prepared and sealed by a registered civil engineer or other information to verify that the water can be disposed of within the property. No water shall be drained across or onto a public street or private property under different ownership than the property generating or containing the surface water. c. Permeable Paving. The commissioner may allow the use of permeable paving as regulated in s. 252-74. For newly paved areas or parking lots, the storm sewer requirement under s. 225-4 may be waived by the commissioner if adequate drainage is provided. d. Alley and Street Drainage. Driveway aprons between the public sidewalk and the public street or between the parking area and the public alley shall be allowed to drain to the public street or the public alley where conditions would cause an unnecessary hardship to the property owner as determined by the commissioner. The maximum area which may be drained to the alley shall not exceed a total area of 10 feet times the length of the property along the public alley. e. Existing Parking Lots. In the following cases, par. a shall apply: e-1. When an existing parking lot or area which does not have an asphalt or concrete pavement is paved. e-2. When an existing parking lot or area is enlarged, the portion to be enlarged shall comply. e-3. When an existing parking lot or area is graded or drained in a manner which will damage or create a nuisance onto adjoining premises or street walk. f. Natural Drainage. Natural or constructed drainage swales and ditches which serve adjacent properties shall be maintained by each property owner through which the natural drainage accrues. Existing natural drainage shall be maintained by ditches, swales, culverts or a catch basin and storm sewer system designed to meet the existing water conditions. Where existing ponding or marsh areas accrue on a continuing seasonal basis, a property owner shall not fill the property in such a manner that the pond or marsh area is shifted off the property onto an adjacent property not under the same ownership. Where it is necessary to fill or grade a property such that a pond or marsh area will be filled, a storm sewer shall be provided to eliminate the water which would be imposed on the adjacent properties. g. Areas of 1,000 Square Feet Or Less. All paved areas of 1,000 square feet or less may discharge to an alley or street with proper drainage. h. Washing of Motor Vehicles. All premises, now or hereafter used for the washing of motor vehicles, where because of such use water drains over a street walk or onto an adjoining premises, approved drains connected to a city sewer shall be provided and constructed as regulated in s. SPS 382.34, Wis. Adm. Code.