SURFACE WATER DRAINAGE

ACCORDING TO THE APPROVAL OF BUILDING, SITE AND OPERATIONAL PLANS.

                                                                                                                                                                      

(a) Purpose. The intent of this section is to protect property and structures from damage caused by increased surface water runoff due to commercial, industrial, and residential development of the land in unincorporated areas of Winnebago County.

 

(b) Increased Surface Water Runoff. Surface water runoff after development shall not be at a greater peak rate or flow nor flow at increased velocities which will cause property and structure damage. A 25-year storm for Winnebago County shall be used for pre-construction runoff calculations and a 50-year storm shall be used for post-construction runoff calculations.

 

(c) Residential, Commercial and Industrial Development. The developer shall submit a surface water drainage plan (drainage) plan for all new commercial, industrial, multi-family and residential developments, and for all additions to commercial, industrial, and multi-family developments. The following standards shall be met:

 

(1) Unplatted Developments:

(a) Four (4) copies of a drainage plan shall be submitted to the Winnebago County Zoning Department prior to construction on commercial, industrial, and multi-family developments.

(b) Drainage plan shall be approved per (e) prior to issuance of a zoning permit.

 

(2) Single Lot Residential Development:

(a) One (1) copy of a drainage plan shall accompany all zoning permit applications and shall be submitted to the Winnebago County Zoning Department.

(b) The drainage plan shall be in compliance with non-conforming uses, structures, and lots in non-shoreland areas.

                                    (c) Drainage plan shall be approved per (e) prior to issuance of a zoning permit.

 

(d) Surface Water Drainage Plan:

 

(1) Industrial, Commercial and Multi-Family and Platted Residential Development--a drainage plan shall include, but not be limited to, the following:

 

(a) A 25-year storm for Winnebago County shall be used for pre-construction runoff calculations and a 50-year storm shall be used for post-construction runoff calculations.

(b) Include soil types, infiltration characteristics of the soil, amount of available detention area, type of vegetative cover, amount of impervious cover, and time response to runoff.

(c) Compatible with County and Township natural drainageways and easements.

(d) Identify bridges, regional drainage patterns; water boundaries; pipes, culverts, catch basins, waterways, ditches, detention and retention basin; and indicate respective size, dimensions, and grades of each.

(e) All drainageways and associated structures shall lie within maintenance easements and be so indicated on final plats.

(f) Direction of the surface water flow by arrows.

(g) Designed in accordance with the United States Department of Agriculture Technical Release No. 55 Urban Hydrology for Small Watersheds and County, City, Village or Township standards, or whichever is more restrictive.

(h) Calculations showing pre- and post-construction surface water runoff.

(i) A statement as to how runoff resulting from construction will affect downstream areas and adjacent property owners.

(j) Indicate methods that will be used to protect downstream areas and adjacent property owners from damage caused by increased surface water runoff.

 

(2) Single Lot Residential Development—requirements shall include:

 

(a) Site location.

(b) General legal description.

(c) Existing buildings, utilities and roads.

(d) Existing surface and subsurface drainage channels and pipes entering or leaving the site.

(e) Lot lines.

(f) Proposed ground cover on all areas of plat pavement, gravel, lawn, field, etc.

(g) Proposed surface and subsurface drainage channels and pipes.

 

(e) Review and Approval. Copies of the drainage plan will be distributed by the Winnebago County Zoning Department to the Winnebago County Land and Water Conservation District and the appropriate City, Village, or Township for review and comment. However, to expedite permit issuance, Sec. 17.02(6)(c)(3)???? shall only be subject to review by the Winnebago County Land and Water Conservation District. Any comments will become part of the record for approval or denial. The County Zoning Administrator shall review each drainage plan and comments received and render a decision either of approval, denial, or approval with condition(s). A decision shall be made within thirty (30) days from receipt of the drainage plan.

 

(f) Appeal. Appeal(s) from the decision of the Zoning Administrator concerning the literal enforcement of this ordinance may be made by any person aggrieved or by any officer, department, board, or bureau of the County. Such appeals shall be filed with the secretary within thirty (30) days after the date of written notice of the decision or order of the Zoning Administrator. Applications may be made by the owner or lessee of the structure, land, or water to be affected at any time and shall be filed with the secretary. Such appeals and application shall include the following:

 

(1) Name and address of the appellant or applicant, owner of the structure, and all abutting and opposite property owners of record.

 

(2) Site plan showing the location, boundaries, dimensions, elevations, uses, and size of the following:

 

(a) Subject site.

(b) Existing and proposed easements, streets and other public ways.

(c) Existing and proposed street, side and rear yards.

(d) Existing and proposed structures.

(e) Off-street parking, loading areas and drive-ways.

(f) Existing highway access restrictions.

(g) In addition, the site plan shall show the location and use of any abutting and opposite lands and their structures within seventy-five (75) feet of the subject site.

(h) Additional information required by the County Planning and Zoning Committee, County Planner, Board of Adjustment, or Zoning Administrator.

(i) Fee receipt from the County Planning and Zoning Office in the amount of two hundred fifty ($250) dollars.