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The design standards for storm water runoff facilities for Zones A, B and C, as described in Section 1043.42, are the following:
Zone A | Zone B | Zone C | |
Criteria | High quality waters. Meets water quality standards. Less than 10% imperviousness. | Degraded physical, biological or water quality indicators. 10% to 25% imperviousness. | Heavily degraded physical, biological or water quality indicators. Greater than 25% imperviousness. |
Storm Water Management Standards | Use infiltration basins, infiltration trenches, extended detention basins, and/or constructed wetlands. Maintain and enhance buffer strips. | Use detention ponds, maintain and enhance buffer strips, and reduce directly connected impervious area. | Use sediment basins, maintain and enhance buffer strips and reduce directly connected impervious area. |
Water Quality Control | Detain the first 0.5" of runoff from the contributing watershed, with detention per Zone B and infiltration where conditions permit, or provide equivalent treatment. | Detain the first 0.5" of runoff from the contributing watershed for 24 hours or provide equivalent treatment. | Provide sedimentation control within the drainage system. |
Bank Erosion Control | Rate of release shall be limited to 0.05 cfs/acre for a 2-year storm event. | None | Storm water runoff shall not exceed the capacity of the downstream conveyance system. |
Flood Control | Detention with infiltration when conditions permit. Release rate of 0.13 cfs/acre per KCDC rules. | Release rate of 0.13 cfs/acre per KCDC rules. | Direct conveyance of storm water runoff with the capacity of downstream system. |
(Ord. 07-2002-10. Passed 7-2-02.)
(a) Any drainage situation not involving any public property water is the responsibility of the proper owner.
(b) In plat and site plan review, the City will only review private property drainage for the purpose of assuring that private property can be drained.
(c) Lot grading and private property drainage is a civil matter among the property owners affected.
(d) To aid contractors and builders in grading private property, a lot grading plan will be required on all development and such information shall be disbursed along with the building permit. This lot grading plan must show:
(1) Any established minimum building opening.
(2) Floodway and floodplain elevations.
(3) All storm sewers, the rise, grades, invert elevations and top of casting elevations.
(4) All storm sewer laterals.
(5) All utility and drainage easements and their full description.
(6) Minimum basement elevation for sanitary sewer.
(7) Direction of drainage on each lot.
(8) Elevations of any constructed surface drainage facilities.
(9) Surface grading of the entire parcel.
(e) A minimum rear yard of 25 feet prior to any drainage encumbrance is required. This will allow opportunity for rear yard use for sheds, play equipment, etc., without concern about water damage or inconvenience.
(f) Prior to construction of any structure on a parcel or lot upon which a floodway easement, floodplain and drainageway exists, the permittee must obtain from the City, a copy of the approved plans showing the location and design elevations of that floodway, floodplain and drainageway. Upon completion of the structure and prior to the issuance of an occupancy permit, the permittee must provide a certification from a registered land surveyor that the floodway, floodplain and drainageway grades and dimensions are as designed. If the floodway, floodplain and drainageway does not conform to the approved plans, the floodway, floodplain and drainageway must be reconstructed and certified prior to the issuance of an occupancy permit for that lot or parcel. Concurrent floodway, floodplain and drainageway reconstruction and issuance of an occupancy permit are permitted only if that action does not present a danger to the safety and welfare of any affected property. To permit concurrent action, the permittee shall provide the City with a performance bond, a letter of credit, or a cash deposit to cover the cost of said reconstruction at a dollar amount established by the City.
(Res. 07-2002-01R. Passed 7-2-02.)
The Council of the City may adopt a resolution establishing more detailed design and performance standards for storm water runoff facilities, consistent with the terms of this chapter, and in order to further implement its goals and purposes.
(Ord. 07-2002-10. Passed 7-2-02.)
The owner or operator of a commercial or industrial establishment shall provide, at their own expense, reasonable protection from accidental discharge or prohibited materials or other wastes into the Municipal storm drain system or watercourses through the use of these structural and non-structural BMPs. Further, any person responsible for a property or premise, which is, or may be, the source of an illicit discharge, may be required to implement, at said person's expense, additional structural and non-structural BMPs to prevent the further discharge of pollutants to the Municipal separate storm sewer system. Compliance with all terms and conditions of a valid NPDES permit authorizing the discharge of storm water associated with industrial activity, to the extent practicable, shall be deemed compliance with the provisions of this section. These BMPs shall be part of a storm water pollution prevention plan (SWPP) as necessary for compliance with requirements of the NPDES permit.
(Ord. 07-2002-12. Passed 8-12-02.)
OTHER MATTERS
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