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HomeMy WebLinkAboutOrd 2055 02/20/1968 ORDINANCE NO. 2055 FLOOD PLAIN ORDINANCE WHEREAS, the Plan Commission of the Village of Mount Prospect did hold a Public Hearing on September 15, 1967 pursuant to legal notice under Case No. 67-21P; and WHEREAS, the Plan Commission of the Village of Mount Prospect did recommend approval of the proposed Flood Plain Ordinance; and WHEREAS, the Metropolitan Sanitary District issued a directive to all municipalities within its jurisdiction in September of 1967 indicating that no sewer permits are to be granted in Flood Plain areas until local governments have passed a Flood Plain Ordinance designed to control flooding in certain areas; and WHEREAS, there are areas within the Village of Mount Prospect subj ect to periodic flooding resulting in a hazard to persons and damage to property from the accumulation or run-off of strom or flood waters; and WHEREAS, the Village of Mount Prospect is undergoing development in heretofore tmdeveloped areas which are located within the areas subj ect to such periodic flooding; and WHEREAS, it is deemed necessary to avoid or lessen the hazards of damage to persons or property resulting from flooding, by prescribing rules and regulations for the purposes; NOW, THEREFORE, BE IT ORDAINED BY THE PRESIDENT AND BOARD OF TRUSTEES OF THE VILLAGE OF MOUNT PROSPECT, COOK COUNTY, ILLINOIS: SECTION 1: That Chapter 23 of the Municipal Code of the Village of Mount Prospect of 1957, as amended, is hereby further amended by adding thereto a new Article 6, which Article 6 of Chapter 23 shall be and read as follows: Article 6. Flood Plain Ordinance Section 23.601. Definitions: (a) "Flood Plain Areas" are those areas delineated on the naps prepared by the United States Geographical Survey in cooperation with the Northeastern Illinois Area Planning Commission. (b) "Flood Base Elevation" is the elevation of the highest flood of record, as indicated on the HYDROLOGIC INVESTIGATION ATLAS as prepared by the United States Geographical Survey in cooperation with the Northeastern Illinois Area Planning Commission. Flood base elevations at intermediate locations shall be interpolated along the water course between the two nearest flood base elevations, one each upstream and downstream. The controlling flood base elevation for any building site shall be the same as the flood base elevation at the nearest point of the water course as measured on a line perpendicular to the direction of the water course. Section 23.602. Flood Plain Rerlations: (a) The Flood Plain Areas shal be subject to flood plain regulations as established by the Village of Mount Prospect and set forth in this ordinance. Said regulations will guide development in order to promote the public health, safety and welfare through flood regulations, provided however, that the provisions of this ordinance shall not apply to existing subdivisions within the flood plain as to which covenants, approved by the Village Board, pertaining to the minimum elevations of streets, lots and structures recorded prior to the date of the passage of this ordinance. (b) No new or existing building or structure shall be erected or moved within a flood plain unless the lowest floor including the basement floor is at an elevation which is not less than two and one-half (2-1/2) feet above the Flood Base Elevation for the site; provided, however, that basement floors may be erected below such elevation when the top of any basement wall or the bottom of any opening therein is not less than two and one-half (2-1/2) feet above such elevation and the construction of such basement floors and walls complies with the requirements of the Village of Mount Prospect Building Code. (c) The elevation of the ground for a minimum distance of five (5) feet 1rrrnediately surrounding any building or structure erected or moved within a flood plain shall be at an elevation which is not less than one (1) foot above the Flood Base Elevation for the site and shall be sloped to drain away from the walls for a distance of at least five (5) feet. (d) The crown of street pavements hereafter built in the Flood Plain Area shall not be lower than the Flood Base Elevation plus two (2) feet, in case of major streets, and plus one (1) foot, in the case of other streets. (e) All sanitary sewer manholes constructed in the Flood Plain Areas must have a rim elevation a minimum of one (1) foot above the record Flood Base Elevation for the area as indicated on the flood map prepared by the United States Geological Survey. When the manhole rim is less than two and one-half (2-1/2) feet above the flood of record a watertight manhole cover must be provided. (f) No building or structure shall be erected or moved within the area bounded on each side of a line parallel to and one hundred (100) feet distance from the center line of Weller Creek. (g) Existing streams, water courses, and flood water run-off channels as delineated by the HYDROIroIC INVESTIGATION ATLAS, or by the determination of the Village Engineer, are to be retained either in their present location or in locations approved by the Village Engineer. Floodway easements of at least twenty (20) feet wide shall be provided and shown on the plat when designated as necessary by the Village Engineer to safeguard the intent of this Ordinance. The easement shall permit necessary public channel maintenance and improvement work and access of equipment therefor but shall prohibit buildings, fences and other obstructing structures thereon by the owner. (h) Retention or Detention Basins; A topographical survey plat shall be submitted to the Village Engineer for detennination of the present run-off factor. A topographical survey indicating the improvements proposed and Flood Plain property displaced must also be submitted. A retention or detention basin may be require on the subject property to accommodate the acre feet displaced as a result of the proposed improvements. The sizing and location of said retention or detention basin shall meet with the approval of the Village Engineer. When a retention or detent. t basin is determined necessary, proper easements shall be granted to insure the maintenance and operational function of same. (i) Exceptions to the elevation restrictions stated herein may be granted upon the recomnendation of the Village Engineer by the Village Board only in certain situations where it can be determin that recent engineering improvements have been undertaken to lowe the actural Flood Base Elevation as defined herein and if the alternate plan of flood control and storm drainage plan is in harmony with the purposes and intent expressed in this Ordinance - 2 - and is equally effective as provided herein. In no case, however, shall a building or structure be allowed to be erected with the lowest foundation opening elevation lower than the Flood Base Elevation. SECTION 2: All ordinances or parts of ordinances in conflict herewith are hereby repealed. SECTION 3: This Ordinance shall be in full force and effect from and after its passage,approval, recordation and publication as provided by law. AYFB: 6 NAYS: 0 PASSED this 20th day of February, 1968. APPROVED this 20th day of February, 1968 Village President A'ITEST: Village Clerk - 3 -