The board of trustees shall take into account flood hazards, to the extent that they are known in all official actions related to land management, use and development.
A. New Construction: New subdivisions, manufactured home parks, annexation agreements, and planned unit developments (PUDs) within the SFHA shall be reviewed to assure that the proposed developments are consistent with sections 11-1-6, 11-1-7, and 11-1-8 of this chapter and the need to minimize flood damage. Plats or plans for new subdivisions, mobile home parks and planned unit developments (PUDs) shall include a signed statement by a registered professional engineer that the plat or plans account for changes in the drainage of surface waters in accordance with the plat act 1 .
B. Flood Data Required: Proposals for new subdivisions, manufactured home parks, travel trailer parks, planned unit developments (PUDs) and additions to manufactured home parks and additions to subdivisions shall include base flood or 100-year frequency flood elevation data and floodway delineations. Where this information is not available from an existing study filed with the Illinois state water survey, the applicant's engineer shall be responsible for calculating the base flood or 100-year frequency flood elevation per subsection 11-1-4D of this chapter, and the floodway delineation per the definition in section 11-1-2 of this chapter and submitting it to the state water survey and IDNR/OWR for review and approval as best available regulatory data.
C. Subdivision And Other Development Standards: All subdivisions and other developments located in an A zone shall provide that:
1. All subdivision and other development proposals shall be designed to minimize flood damage to the proposed subdivision or development site as well as to other properties.
2. All public utilities and facilities, such as sewer, gas, electrical and water systems shall be located, elevated and constructed to minimize or eliminate flood damage.
3. Adequate drainage shall be provided as to reduce exposure to flood hazards.
4. For any proposed subdivision or new development greater than fifty (50) lots or five (5) acres, whichever is the lesser, the applicant shall show the base flood elevation data for each lot or platted parcel. Provided, that if the base flood elevation data is not available, the applicant shall compute and provide the information for each lot or platted parcel greater than fifty (50) lots or five (5) acres, whichever is the lesser.
5. New mobile home parks and subdivisions, expansions to existing mobile home parks and subdivisions, and existing mobile home parks and subdivisions where the repair, reconstruction and improvement of the streets, utilities and pads equals or exceeds fifty percent (50%) of the value of the streets, utilities and pads before the repair, reconstruction or improvement has commenced shall:
a. Have stands or posts elevated or compacted fill or on pilings so that the lower floor of the mobile home will be one foot (1') above the base flood elevation.
b. Have adequate drainage, and access for a hauler provided.
c. In the instance of elevation on pilings have:
(1) Lots large enough to permit steps.
(2) Piling foundations placed in a stable soil no more than ten feet (10') apart.
(3) Reinforcement provided for pilings more than six feet (6') above the ground level.
D. Utility Standards: All new construction and substantial improvements to utilities located in an A zone shall provide that:
1. All new and replacement water supply systems shall be designed to maximize or eliminate infiltration of floodwater into the system.
2. All new and replacement sanitary sewerage systems shall be designed to minimize or eliminate infiltration of floodwaters into the systems and discharges from the systems into the floodwaters.
3. All new and replacement on site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding.
E. Public Grounds: Streets, blocks, lots, parks and other public grounds shall be located and laid out in such a manner as to preserve and utilize natural streams and channels. Wherever possible, the floodplains shall be included within parks or other public grounds.
F. Planned Unit Developments: The board of trustees shall not approve any planned unit development (PUD) or plat of subdivision located outside the corporate limits unless such agreement or plat is in accordance with the provisions of this chapter. (Ord. 1630, 4-12-1999)
Notes
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