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Any work involving the construction, modification or removal of a dam as defined in Section 13-1-2 of this Chapter, per 92 Illinois Administrative Code 702 (Rules for Construction of Dams) shall obtain an Illinois Division of Water Resources dam safety permit prior to the start of construction of a dam. If the Enforcement Officer finds a dam that does not have a DWR permit he shall immediately notify the Dam Safety Section of the Division of Water Resources. If the Enforcement Officer finds a dam which is believed to be in unsafe condition, he shall immediately notify the owner of the dam, DWR, Dam Safety Section in Springfield and the Illinois Emergency Services and Disaster Agency (ESDA). (Ord. 91-20, 12-12-1991)
The following activities may be permitted without a registered professional engineer's review. Such activities shall still meet the other requirements of this Chapter, including the mitigation requirements:
A. Underground and overhead utilities that:
1. Do not result in any increase in existing ground elevations; or
2. Do not require the placement of above ground structures in the floodway; or
3. In the case of underground stream crossings, the top of the pipe or encasement is buried a minimum of three feet (3') below the existing stream bed; and
4. In the case of overhead utilities, no supporting towers are placed in the watercourse and all such towers are designed in such a fashion as not to catch debris.
B. Storm and sanitary sewer outfalls that:
1. Do not extend riverward or lakeward of the existing adjacent natural bank slope; and
2. Do not result in an increase in ground elevation; and
3. Are designed so as not to cause stream erosion at the outfall location.
C. Construction of sidewalks, athletic fields (excluding fences), properly anchored playground equipment and patios at grade.
D. Construction of shoreline and streambank protection that:
1. Does not exceeds one thousand feet (1,000') in length.
2. Materials are not placed higher than the existing top of bank.
3. Materials are placed so as not to reduce the cross-sectional area of the stream channel or bank of the lake.
4. Vegetation stabilization and gradual side slopes are the preferred mitigation methods for existing erosion problems. Where high channel velocities, sharp bends or wave action necessitate the use of alternative stabilization measures, natural rock or riprap are preferred materials. Artificial materials such as concrete, construction rubble, and gabions should be avoided unless there are no practicable alternatives.
E. Temporary stream crossings in which:
1. The approach roads will be one-half foot (1/2') or less above natural grade.
2. The crossing will allow stream flow to pass without backing up the water above the stream bank vegetation line or above any drainage tile or outfall invert.
3. The top of the roadway fill in the channel will be at least two feet (2') below the top of the lowest bank. Any fill in the channel shall be nonerosive material, such as riprap or gravel.
4. All disturbed stream banks will be seeded or otherwise stabilized as soon as possible upon installation and again upon removal of construction.
5. The access road and temporary crossings will be removed within one year after authorization. (Ord. 91-20, 12-12-1991)
In SFHA or flood plains, (including AO Zones, AH Zones or Un-numbered A Zones) where no floodways have been identified and no base flood or 100-year frequency flood elevations have been established by FEMA, and draining more than a square mile, no development shall be permitted unless the cumulative effect of the proposals, when combined with all other existing and anticipated uses and structures, shall not significantly impede or increase the flow and passage of the floodwaters nor significantly increase the base flood or 100-year frequency flood elevation. (Ord. 91-20, 12-12-1991)
A. No person, firm, corporation, or governmental body, not exempted by State law, shall commence any development in a SFHA or flood plain without first obtaining a development permit from the Village.
1. Application for a development permit shall be made on a form provided by the Village.
2. The application shall be accompanied by drawings of the site, drawn to scale showing property line dimensions; and existing grade elevations and all changes in grade resulting from excavation or filling, sealed by a licensed engineer, architect or surveyor; the location and dimensions of all buildings and additions to buildings; and the elevation of the lowest floor (including basement) of all proposed buildings subject to the requirements of Article V of this Chapter.
3. The application for a development permit shall also include the following information:
a. A detailed description of the proposed activity, its purpose, and intended use.
b. Site location (including legal description of the property, drawn to scale, on the regulatory floodway maps, indicating whether it is proposed to be in an incorporated or unincorporated area.
c. Anticipated dates of initiation and completion of activity.
d. Plans of the proposed activity shall be provided which include as a minimum:
(1) A vicinity map showing the site of the activity, name of the waterway, boundary lines, names of roads in the vicinity of the site, graphic or numerical scale, and north arrow;
(2) A plan view of the project and engineering study reach showing existing and proposed conditions including principal dimensions of the structure or work, elevations in mean sea level (1929 adjustment) datum or NGVD, adjacent property lines and ownership, drainage and flood control easements, distance between proposed activity and navigation channel (when the proposed construction is near a commercially navigable body of water), flood plain limit, location and orientation of cross sections, north arrow, and graphical or numerical scale;
(3) Cross section views of the project and engineering study reach showing existing and proposed conditions including principal dimensions of the work as shown in plan view, existing and proposed elevations, normal water elevation, 10-year frequency flood elevation, 100-year frequency flood elevation, and graphical or numerical scales (horizontal and vertical); and
(4) A soil erosion and sedimentation control plan for disturbed areas. This plan shall include a description of the sequence of grading activities and the temporary sediment and erosion control measures to be implemented to mitigate their effects. This plan shall also include a description of final stabilization of a responsible party to ensure post-construction maintenance.
e. Engineering calculations and supporting data shall be submitted showing that the proposed work will meet the criteria of Section 13-4-3 of this Article.
f. Any and all other local, State and Federal permits or approvals that may be required for this type of development.
B. Based on the best available existing data according to the Illinois State Water Survey's Flood Plain Information Repository, the Village Engineer shall compare the elevation of the site to the base flood or 100-year frequency flood elevation. Should no elevation information exist for the site, the developer's engineer shall calculate the elevation according to subsection 13-1-5D of this Chapter. Any development located on land that can be shown to have been higher than the base flood elevation as of the site's first Flood Insurance Rate Map identification is not in the SFHA and, therefore, not subject to the requirements of this Chapter. The Village Engineer shall maintain documentation of the existing ground elevation at the development site and certification that this ground elevation existed prior to the date of the site's first Flood Insurance Rate Map identification.
C. The Village Engineer shall be responsible for obtaining from the applicant copies of all the local, State and Federal permits, approvals or permit-not-required letters that may be required for this type of activity. The Village shall not issue the development permit unless all required local, State and Federal permits have been obtained. (Ord. 91-20, 12-12-1991)
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