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Graveled roads, access drives, parking areas of sufficient width and length and vehicle wash down facilities, if necessary, shall be provided to prevent soils from being tracked onto public or private roadways. Any soil tracked onto a public or private roadway shall be removed before the end of each workday or sooner as directed by the authority maintaining the roadway.
(Ord. 10-164, passed 6-17-2010)
Temporary stream crossings of intermittent and perennial streams used only for and during construction shall be designed to convey a two-year flood (minimum) or other flood event approved by the Chief Subdivision Engineer without overtopping unless a more frequent design event is allowed by the Chief Subdivision Engineer. The entire crossing shall be designed to withstand hydrodynamic forces and erosive forces up to the base flood event without washing out. Ephemeral streams may be crossed at temporary at-grade crossings provided that the crossing point is stabilized with materials resistive to the erosive forces produced by runoff from the upstream drainage area, and the design is approved by the Chief Subdivision Engineer. Temporary stream crossings shall be removed upon completion of construction activities. All temporary stream crossing shall be completely removed and the stream restored to its preconstruction condition upon completion of construction. Restoration shall incorporate appropriate vegetation consistent with the adjacent existing vegetation prior to construction or in accordance with a restoration plan approved by the Chief Subdivision Engineer.
(Ord. 10-164, passed 6-17-2010)
PROTECTION OF SPECIAL MANAGEMENT AREAS
(A) This subchapter sets forth requirements for developments within floodplains and floodways. In addition, developments in the SFHA draining more than one square mile with no designated floodway must meet IDNR/OWR Ill. Adm. Code Part 3700 Rules. References to IDNR/OWR permits or approvals in this section shall be construed as “their designee” where a portion or all of their authority has been delegated.
(B) Development that qualifies for any of the self-issuing statewide or regional permits administered by IDNR/OWR (Statewide Permit Nos. 1 though 14 and Regional Permit No. 3) are similarly permitted under this subchapter. The applicant’s state professional engineer shall certify to the Chief Subdivision Engineer that the development qualifies for the particular statewide or regional permit in question under the regulations established by IDNR/OWR for the permit. All other provisions of this chapter and other ordinances applicable to the development, however, continue to apply. However a permit from the county must still be issued.
(Ord. 10-164, passed 6-17-2010)
(A) Regulatory floodplain. The floodplains are those lands within the jurisdiction of the county that are subject to inundation by the base flood or 100-year frequency flood. The floodplains of the county are generally identified on the countywide flood insurance rate map of the county prepared by FEMA. The BFE shall be delineated onto the site topography to establish the regulatory floodplain area limits for regulation under this chapter. Regulatory floodplains shall be delineated onto the site map from the current FEMA FIRM, FBFM or LOMR and include those areas of the SFHA which are not regulatory floodplains.
(B) Base flood elevation (BFE). The BFE shall be:
(1) The elevation of the 100-year profile corresponding to the location of the development as indicated in the flood profiles in the FEMA flood insurance studies listed in Appendix B (which may be updated from time to time);
(2) In the case of FEMA delineated “AH Zones” the elevation noted on the map shall be the BFE. In the case of FEMA delineated “AO Zones” the BFE shall be the elevation or depth added to the highest adjacent grade (or at least two feet about the highest adjacent grade if no depth number is provided) shown on the countywide flood insurance rate map of the county;
(3) If a base flood elevation or 100-year frequency flood elevation is not available for a particular site, then the protection standard shall be according to the best existing data available from federal, state or other sources. When a party disagrees with the best available data, they shall submit a detailed engineering study needed to replace existing data with better data and submit it to IDNR/OWR and FEMA for review and consideration prior to any development of the site.
(a) When no BFE information exists, the BFE for a riverine SFHA shall be determined using a site-specific floodplain study by a professional engineer using appropriate hydrologic and hydraulic models as follows:
1. The base flood elevation for a riverine SFHA shall be determined from a backwater model, such as HEC-II, HEC-RAS, or a dynamic model such as HIP;
2. The flood flows used in the hydraulic models shall be obtained from a hydrologic model, such as HEC-HMS, HEC-1, TR-20 or HIP or by techniques presented in various publications prepared by the United States Geological Survey for estimating peak flood discharges; or
3. A technique approved by the Chief Subdivision Engineer and the IDNR/OWR.
(b) Where a channel has a tributary drainage area of 640 acres or more, the above analyses shall be submitted to the IDNR/OWR for concurrent approval.
(c) For a non-riverine regulatory floodplain, the historic flood of record plus three feet may be used for the BFE instead of performing a detailed hydrologic and hydraulic study.
(4) For floodplains that are not regulatory, are not draining more than 640 acres, and with no BFE determined, the Chief Subdivision Engineer may require a site-specific floodplain study for the purpose of establishing an FPE for the development.
(C) Regulatory floodplain locations.
(1) The location of the regulatory floodway shall be as delineated on the current effective regulatory maps maintain by the county. The floodways are designated on the countywide flood insurance rate map of the county, prepared by FEMA. When two floodway maps exist for a waterway, the more restrictive floodway limit shall prevail. The location of the regulatory floodway boundary shall be scaled onto the site plan using references common to both the map and the plan (typically the township section lines). Where an interpretation is needed to determine the exact location of the regulatory floodway boundary, IDNR/OWR should be contacted.
(2) Note: If an area of the site is located in the regulatory floodway that is higher than the BFE, that area is subject to the floodway standards of § 164.064, including the appropriate use criteria, until such time as a LOMR is received from FEMA with concurrence by IDNR/OWR.
(3) General criteria for analysis of flood elevations in the regulatory floodway are as follows.
1. The flood profiles, flows and data in the current effective FIS must be used for analysis of the base conditions. If the study data appears to be in error or conditions have changed, FEMA and IDNR/OWR shall be contacted for approval and concurrence on the appropriate base conditions data to use. The County Executive and the Chief Subdivision Engineer shall be copied on all related correspondence.
2. If the BFE at the site of the proposed development is affected by backwater from a downstream receiving stream with a larger drainage area, the proposed development shall be shown to meet the requirements of this section with the receiving stream at both the normal water and BFEs.
3. If the applicant is informed by IDNR/OWR, local governments or a private owner that a downstream or upstream restrictive bridge or culvert is scheduled to be removed, reconstructed, modified or a regional flood control project is scheduled to be built, removed, constructed or modified within the next five years, the proposed development shall be analyzed and shown to meet the requirements of this section for both the existing conditions and the expected flood profile conditions when the bridge, culvert or flood control project is built, removed or modified as applicable.
4. If the appropriate use will result in a change in the regulatory floodway location or a change in the BFE, the applicant shall submit the information required to be issued a conditional letter of map revision (CLOMR) to IDNR/OWR and FEMA. A public notice inviting public comment on the proposed change in the BFE or location of the regulatory floodway will be issued by IDNR/OWR or its designee before a CLOMR is issued. Filling, grading, dredging or excavating may take place upon issuance of a conditional approval from IDNR/OWR and the Administrator. No further development activities shall take place in the existing or proposed floodplain until a letter of map revision (LOMR) is issued by FEMA unless such activities meet all the requirements of § 164.062. The Director shall be copied on all related correspondence.
5. For those circumstances listed below and located in a regulatory floodway, at a minimum, the following information shall be submitted to IDNR/OWR for their review and concurrence:
a. Analysis of the flood profile due to a proposed bridge, culvert crossings and roadway approaches;
b. An engineer’s determination that an existing bridge, culvert crossing or approach road is not a source of flood damage and the analysis indicating the proposed flood profile;
c. Alternative transition sections and hydraulically equivalent compensatory storage; and
d. Stormwater management permits to local units of government for regulatory floodway and floodplain development.
6. IDNR/OWR will issue permits for any IDNR/OWR projects, dams and the like all other state, federal or local projects.
(Ord. 10-164, passed 6-17-2010)
(A) Generally. The following general performance standards are applicable to all development in a regulatory floodplain. The standards of this section apply except when superseded by more stringent requirements in the subsequent sections.
(1) No development except as allowed in § 164.066 shall be allowed in the regulatory floodplain that singularly or cumulatively creates an increase in flood stage or velocity off-site, or a damaging or potentially damaging increase in flood heights or velocity on-site or threat to public health, safety and welfare.
(2) For all projects involving a channel modification, fill, stream maintenance or a levee, the flood conveyance and storage capacity of the regulatory floodplain shall not be reduced.
(3) If the proposed development would result in a change in the regulatory floodplain or BFE as indicated in Appendix B, the applicant shall obtain a LOMR from FEMA. No buildings may be built in the existing or proposed regulatory floodplain until the LOMR receives concurrence from IDNR/OWR and is issued by FEMA and the building meets all the building protection standards (division (C) below). Proposed changes to the regulatory floodway delineation and the BFE must be submitted to IDNR/OWR for concurrence.
(4) If the development is located in a public body of water, as defined by IDNR/OWR (Appendix C), a permit or a waiver of a permit must also be received from IDNR/OWR.
(5) Prior to the commencement of any construction, modification or removal of a dam, the developer shall obtain an IDNR/OWR permit or letter indicating a permit is not required.
(6) (a) For public flood control projects, the floodplain management standards will be considered met if the applicant can demonstrate to IDNR/OWR and Chief Subdivision Engineer that each of the following conditions are met:
1. Demonstrate by hydraulic and hydrologic modeling that the proposed project will not singularly or cumulatively result in increased flood heights outside the project site or demonstrate that any increases will be contained in easements for all flood events up to and including the base flood event;
2. Demonstrate that the project will be operated and maintained by a public agency; and
3. Demonstrate that the project will reduce flood damage to an existing building or structure.
(b) These standards do not preclude the design, engineering, construction or financing, in whole or in part of a public flood control project by persons who are not public agencies.
(7) Proposals for new subdivisions, manufactured home parks, planned unit developments (PUDs) and additions to manufactured home park and additions to subdivisions shall include base flood or 100-year frequency flood elevation data and floodway delineations.
(8) Critical facilities shall not be permitted within the 500-year floodplain.
(B) Public health protection standards.
(1) New and replacement water supply systems, wells and sanitary sewer lines may be permitted if all manholes or other aboveground openings located below the FPE are watertight.
(2) New on-site waste disposal systems, such as septic systems, are allowed in the regulatory floodplain only if they meet all of the following conditions.
(a) The invert of any wastewater distribution lines shall be a minimum of two feet above the water surface elevation of the base flow of any perennial stream.
(b) The lateral distance from a ditch, creek or other riverine source to the wastewater distribution lines shall be a minimum of 75.
(c) The elevation of any areas which are to receive wastewater distribution shall be above the ordinary high water mark.
(d) The soil of the receiving field shall be of a type suitable for septic fields.
(e) The tank shall be placed out of the floodplain with the invert of the outlet above the BFE.
(3) New, substantially improved or replacement wastewater treatment plants shall have watertight openings for those openings located below the FPE. These facilities should be located to avoid impairment to the facility or contamination of floodwaters during the base flood.
(C) Building protection standards. The building protection standards apply to all buildings located in the regulatory floodplain; however, it should be noted that most new and replacement buildings are not appropriate uses of the regulatory floodway.
(1) The lowest floor including basements of all new residential structures, substantially improved structures and additions shall be elevated up to at least the flood protection elevation.
(a) If placed on fill, the top of the fill for the residential structure shall be at the flood protection elevation (FPE) or higher. The top of fill for an attached garage shall be at least 0.1 foot above the base flood elevation (BFE). The fill shall be placed at that elevation for a distance of ten feet out from the building unless the building design is certified by a registered structural engineer to be protected from damages due to hydrostatic pressures. Additionally, the fill shall not settle below the FPE for the residential structure and not below 0.1 feet above the base flood for an attached garage, and shall be adequately protected against erosion, scour and differential settlement. The fill shall not adversely affect surface drainage from or onto neighboring properties. All structures placed on fill in the floodplain shall meet the requirements of this chapter and FEMA Technical Bulletin 10-01, and the applicant’s design engineer shall certify that the land or structures to be removed from the special flood hazard area are reasonably safe from flooding.
(b) If elevated by means of walls, pilings or other foundation, the building’s supporting structure must be permanently open to flood waters and not subject to damage by hydrostatic pressures of the base flood. The permanent openings shall be no more than one foot above existing grade, and consist of a minimum of two openings. The openings must have a total net area of not less than one square inch for every one square foot of enclosed area subject to flooding below the BFE. The lowest inside grade must match the lowest existing outside grade adjacent to the structure. The foundation and supporting members shall be anchored and aligned in relation to flood flows and adjoining structures so as to minimize exposure to known hydrodynamic forces such as current, waves, ice and floating debris. All areas below the FPE shall be constructed of materials resistant to flood damage. The lowest floor (including basement) for the residential structure and all electrical, heating, ventilating, plumbing and air conditioning equipment and utility meters shall be located at or above the FPE. An attached garage must be elevated to at least 0.1 feet above the BFE. Water and sewer pipes, electrical and telephone lines, submersible pumps and other waterproofed service facilities may be located below the FPE. No area below the FPE shall be used for storage.
(2) The lowest floor including the basement of all new or substantially improved nonresidential buildings shall be elevated at least to the FPE as described above or be structurally dry flood proofed to at least the FPE. A nonresidential building may be structurally dry flood proofed (in lieu of elevation) provided that a professional engineer or registered structural engineer shall certify that the building has been structurally dry flood proofed below the FPE and the structure and attendant utility facilities are watertight and capable of resisting the effects of the base flood. The building design shall take into account flood velocities, duration, rate of rise, hydrostatic and hydrodynamic forces, the effects of buoyancy and impacts from debris or ice. Flood proofing measures shall be operable without human intervention and without an outside source of electricity. (Levees, berms, floodwalls and similar works are not considered flood proofing for the purpose of this division.)
(3) Manufactured homes and recreational vehicles to be installed on a site for more than 180 days shall be at or above the FPE and shall be anchored to resist flotation, collapse or lateral movement in accordance with the Illinois Manufactured Home Tie-Down Code (77 Ill. Adm. Code 870) as amended.
(4) (a) Accessory structures, such as tool sheds and detached garages which are not substantial improvements on an existing single-family lot, may be constructed with the lowest floor below the FPE in accordance with the following criteria.
1. The building shall not be used for human habitation.
2. All areas below the FPE shall be constructed with waterproof material. Structures located in a regulatory floodway shall meet the floodway standards in § 164.064.
3. The structure shall be anchored to prevent flotation and movement.
4. Service facilities such as electrical and heating equipment shall be elevated or flood proofed to the FPE.
5. The building shall be no greater than 600 square feet in floor size, and be valued at less than $7,500. The building shall meet the permanent opening criteria of division (C)(1)(b) above.
6. The building shall be used only for the storage of vehicles or tools and may not contain basements or other rooms, workshops, greenhouses or similar uses.
(b) Accessory structures that do not meet all of the above criteria may be constructed if they are dry flood proofed or elevated at least one-half of one foot above the BFE.
(D) Nonconforming structures. A nonconforming structure damaged by flood, fire, wind or other disaster may be restored unless the damage meets or exceeds 50% of its market value before it was damaged, in which case it shall conform to the building protection standards of this chapter.
(E) LOMR-F. A LOMR-F must be issued by FEMA before a building permit may be issued for structures built on fill in the floodplain. A permit shall not be issued unless the applicant has complied with all the following criteria.
(1) Compensatory storage shall be provided per § 164.063.
(2) The elevation of the lowest opening in the basement wall (i.e., window wells, access ways) shall be at or above the flood protection elevation (FPE).
(3) The lowest adjacent grade to the foundation shall be at or above the FPE for a minimum distance of ten feet beyond the outside face of the structure. However, if site conditions are such that this requirement cannot be met, the Chief Subdivision Engineer may waive the ten foot minimum setback if a state licensed professional engineer certifies that an alternative method to protect the building from damage due to hydrostatic pressure has been met. The certifications shall be in the form of a detailed soils and structural design analysis, which shall be submitted to the Chief Subdivision Engineer for review. The Chief Subdivision Engineer may require additional documentation as necessary to prove that the proposed shorter setback distance will keep the structure reasonably safe. In no case shall the setback distance be less than four feet.
(4) The grade around the perimeter of the structure, measured at a distance of 20 feet from the structure, shall be above the base flood elevation (BFE). However, if site conditions are such that this requirement cannot be met, the Chief Subdivision Engineer may waive the 20-foot minimum setback distance if a state licensed professional engineer certifies that an alternative method to protect the building from damages due to hydrostatic pressures have been met. A detailed soils analysis and structural design proving that a shorter setback distance will keep the structure reasonably safe from flooding, shall be submitted to the Chief Subdivision Engineer for review. In no case shall the setback distance be less than four feet.
(5) The ground around the building shall be compacted fill that meets all requirements of this division and is at least five feet thick under the basement floor slab. Nothing in this division shall be interpreted to require the removal or replacement of fill that was placed as part of a LOMR-F, if the fill consists of material, including soils of similar classification and degree permeability, as those classified as CH, CL, SC or ML according to ASTM standard D-2487, Classification of Soils for Engineering Purposes.
(6) The fill material must be homogeneous and isotropic; that is, soil must be all of one material, and the engineering priorities must be in the same direction.
(7) All fill material and compaction shall be designed, certified and inspected by a state licensed professional engineer, as warranted by the site conditions.
(8) The basement floor shall be at an elevation that is no more than five feet below the BFE.
(9) There shall be a granular drainage layer beneath the floor slab, and minimum of one quarter horsepower sump pump with a backup power supply shall be provided to remove seepage flow. The pump shall be rated at four times the estimated seepage rate and shall discharge above the BFE and away from the building in order to prevent flooding of the basement or uplift of the floor under the effect of the seepage pressure.
(10) The drainage system shall be equipped with a positive means of preventing backflow.
(11) All foundation elements shall be designed to withstand hydrostatic pressure in accordance with accepted engineering practices.
(12) If the applicant is unable to meet all of the requirements set forth in divisions (E)(1) through (E)(11) above, the Chief Subdivision Engineer may allow the construction of a basement below the BFE only if the applicant demonstrates that the proposed fill and structure meet the guidelines and requirements set forth in FEMA Technical Bulletin 10-01 and are reasonably safe from flooding. In order to demonstrate that the proposed structure is reasonably safe from flooding, the applicant shall submit a detailed engineering analysis of the proposed fill and foundation wall. The engineered basement study shall be completed in accordance with the latest edition of FEMA Technical Bulleting 10-01 with the analysis of the fill being prepared by a state licensed professional engineer.
(13) In order to provide the required compensatory storage on site, in no case shall the depth of excavation in the front and side yards of the lot exceed 18 inches, as measured from the previously existing natural grade. The rear yard shall be permitted to have a greater depth of excavation, if necessary. All excavation shall be constructed to drain freely and openly to the watercourse or storm sewer system. The use of mechanical means to drain the compensatory storage area will not be permitted.
(Ord. 10-164, passed 6-17-2010)
Whenever any portion of a floodplain is authorized for use, the volume of space which will be occupied by the authorized fill or structure below the base flood or 100-year frequency flood elevation shall be compensated for and balanced by a hydraulically equivalent volume of excavation taken from below the base flood or 100-year frequency flood elevation. The following standards apply within the regulatory floodplain.
(A) Hydraulically equivalent compensatory storage volume will be required for development in a riverine or non-riverine regulatory floodplain and shall be at least one and one-fourth times the regulatory floodplain flood storage volume displaced. The storage volume displaced below the existing ten-year frequency flood elevation must be replaced below the proposed ten-year frequency flood elevation. The storage volume displaced above the ten-year existing frequency flood elevation must be replaced above the proposed ten-year frequency flood elevation.
(B) Compensatory storage areas shall be designed to drain freely and openly to the watercourse, and in the case of streams and watercourses, the excavation shall be located opposite or adjacent to the areas so filled or occupied.
(C) A recorded covenant running with the land is required to maintain the compensatory storage volume in areas modified to provide compensatory storage volume.
(D) Existing depressional storage shall meet the requirements of § 164.021(F).
(Ord. 10-164, passed 6-17-2010)
(A) The only development in a regulatory floodway which will be allowed are appropriate uses which will not cause an increase in flood heights or velocities for all flood events up to and including the base flood, and which will not create a damaging or potentially damaging increase in flood heights or velocity, or be a threat to public health and safety and welfare, or impair the natural hydrologic and hydraulic functions of the floodway or channel, or permanently impair existing water quality of aquatic habitat. Construction impacts shall be minimized by appropriate mitigation methods. Only those appropriate uses listed in 17 Ill. Adm. Code Part 3708 will be allowed in the regulatory floodway.
(B) Appropriate uses do not include the construction or placement of any new structures, fill, building additions, buildings on stilts, excavation or channel modifications done to accommodate otherwise non-appropriate uses in the floodway, fencing (including landscaping or planting designed to act as a fence) and storage of materials except as specifically defined below as an appropriate use. If the development is proposed for the regulatory floodway portion of the regulatory floodplain, the following standards apply in addition to the standards for the regulatory floodplain.
(1) The approved appropriate uses are as follows:
(a) Public flood control structures, dikes, dams and other public works or and private improvements relating to the control of drainage flooding, erosion, water quality or habitat for fish and wildlife;
(b) Structures or facilities relating to the use of, or requiring access to, the water or shoreline, such as pumping and treatment facilities, and facilities and improvements relating to recreational boating, commercial shipping and other functionally water dependent uses;
(c) Storm and sanitary sewer outfalls;
(d) Underground and overhead utilities;
(e) Recreational facilities such as playing fields, and trail systems including any related fencing (at least 50% open when viewed from any one direction) built parallel to the direction of flood flows, and including open air pavilions and toilet facilities (four stall maximum) that will not block flood flows nor reduce floodway storage;
(f) Detached garages, storage sheds, boat houses or other non-habitable structures without sanitary facilities that are accessory to existing buildings and will not block flood flows nor reduce regulatory floodway storage;
(g) Bridges, culverts, roadways, sidewalks, railways and taxiways and any modification thereto;
(h) Parking lots built at or below existing grade provided that either:
1. The BFE is less than one foot above the proposed parking lot; or
2. The parking lot is accessory to short-term outdoor recreational facilities and the owner agrees to restrict access during periods of inundation and agrees to accept liability for all damage caused by vehicular access during flooding events.
(i) Regulatory floodway grading, without fill, to create a positive non-erosive slope toward a channel;
(j) Floodproofing activities to protect previously existing lawful structures including the construction of water-tight window wells, elevating structures, or the construction of flood walls around residential, commercial or industrial principal structures where the outside toe of the floodwall shall be no more than ten feet away from the exterior wall of the existing structure, and, which are not considered to be substantial improvements to the structure;
(k) The repair, replacement or reconstruction of a damaged building, provided that none of the outside dimensions of the building are increased and if the building was damaged to 50% or more of the market value before the damage occurred, the building will be protected from flooding to the flood protection elevation; and
(l) Modifications to an existing building that would not increase the enclosed floor area of the building below the BFE and which will not block flood flows including, but not limited to, fireplaces, bay windows, decks, patios and second story additions. If the building is improved to 50% or more of the market value before the modification occurred (i.e., a substantial improvement), the building will be protected from flooding to the flood protection elevation.
(2) Additions or changes to the above list of appropriate uses must be approved by the Committee prior to the adoption by the County Board and IDNR/OWR.
(3) All development in the regulatory floodway shall require a permit from IDNR-OWR and must be in accordance with all provisions of this chapter.
(4) Within the designated floodway, the construction of an appropriate use will be considered permissible provided that the proposed project meets the following engineering and mitigation criteria and is so stated in writing with supporting plans, calculations and data prepared and signed by a professional engineer and provided that any structure meets the protection requirements of this chapter.
(a) All effective regulatory floodway conveyance lost due to the development of appropriate uses, other than bridge or culvert crossings or on-stream structures or dams, shall be replaced for all flood events up to and including the base flood.
(b) The following expansion and contraction ratios shall be used to determine transition sections in calculations of effective regulatory floodway conveyance.
1. Flowing water will expand no faster than at a rate of one foot horizontal for every four feet of the flooded stream’s length.
2. Flowing water will contract no faster than at a rate of one foot horizontal for every one foot of the flooded stream’s length.
3. Flowing water will not expand or contract faster than one foot vertical for every ten feet of flooded stream length.
4. All cross-sections used in the calculations shall be located perpendicular to flood flows.
5. Transition sections must be used to determine the effective conveyance areas on adjacent properties.
(c) Development of an appropriate use will not result in an increase in the average channel or regulatory floodway velocities or stage. However, in the case of bridges or culverts or on stream structures built for the purpose of backing up water in the stream during normal or flood flows, velocities may be increased at the structure site if scour, erosion and sedimentation will be avoided by the use of riprap or other design measures.
(5) In the case of on-stream structures built for the purpose of backing up water during normal or flood flows, the increase in flood stage when compared to existing conditions for all storm events up to and including the base flood event shall be contained within recorded easements or the channel banks. A dam safety permit or letter indicating a dam safety permit is not required must be obtained from IDNR/OWR for these structures.
(6) IDNR/OWR will issue permits for any IDNR/OWR projects, dams and the like and for all other state or local projects.
(Ord. 10-164, passed 6-17-2010)
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