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The stormwater submittal shall include a narrative discussion and calculations to support a finding by the qualified review specialist that the proposed development complies with the technical requirements of this subchapter. The submittal shall consist, at a minimum, of the following material.
(A) Narrative description of the existing and proposed site drainage patterns and conditions, including description of offsite conditions that help to identify stormwater issues considered in the design.
(B) Schedule for implementation of the site stormwater plan.
(C) Onsite and offsite runoff calculations that address the following:
(1) Documentation of the procedures and assumptions used to calculate hydrologic and hydraulic conditions for sizing major and minor systems;
(2) Cross-section data for open channels;
(3) Hydraulic grade line and water surface elevations under design flow conditions; and
(4) Hydraulic grade line and water surface elevations under base-flood-flow conditions.
(D) Site runoff storage calculations that address the following:
(1) Calculation of hydraulically connected impervious area and corresponding retention volume;
(2) Documentation of the procedures and assumptions used to calculate hydrologic and hydraulic conditions for determining the allowable release rate;
(3) Documentation of the procedures and assumptions used to calculate hydrologic and hydraulic conditions for determining the storage volume;
(4) Elevation-area-storage data and calculations for site runoff storage; and
(5) Elevation-discharge data and calculations specifically related to the outlet control structure depicted in the plan exhibits.
(Ord. 2019-03, passed 4-15-2019)
The applicant shall obtain approval from IDNR-OWR and FEMA, when required, for all new base flood and floodway determinations or as required in this subchapter. Documentation supporting a finding by the qualified review specialist that the proposed development is in compliance with this subchapter, and shall be submitted with the application. At a minimum, the following material shall be submitted for approval with the application.
(A) Regulatory floodplain boundary determina-tion.
(1) Provide source of flood profile information; and
(2) Provide all hydrologic and hydraulic study information for site-specific floodplain studies, unnumbered Zone A area elevation determinations, and floodplain map revisions.
(B) Floodplain fill and compensatory storage calculations. Floodplain fill and compensatory storage calculations for below and above ten-year flood elevation, up to the base flood elevation.
(1) Tabular summary for below and above ten-year flood elevation of fill, compensatory storage and compensatory storage ratios provided in proposed plan; and
(2) Cross sections used for the above calculations.
(C) Floodproofing measures.
(1) Narrative discussion of floodproofing measures including material specifications, calculations, design details and operation summary; and
(2) Flood easements, when required by this subchapter.
(D) Current statewide permits. Current statewide permits and such information that indicates that the development qualifies for the particular permits in question under the regulations established for such permit(s) by IDNR-OWR.
(Ord. 2019-03, passed 4-15-2019)
(A) The applicant shall obtain a permit for all federally regulated activities involving waters of the U.S. from the appropriate federal authorities. The applicant shall obtain a permit from the county (or the certified community) for all developments having a wetland impact. The applicant shall indicate on the plans the location of any onsite wetland mitigation required by a COE permit and, in narrative form, the location of all offsite mitigation.
(B) A wetland submittal in accordance with the detailed requirements of this subchapter shall be required. In general, the submittal will consist of the following material:
(1) Wetland delineation report (COE format);
(2) Calculation of required buffer (including the size and quality when calculated);
(3) Wetland delineation plan, plan view drawing:
(a) All existing and proposed impacted or undisturbed onsite wetlands;
(b) Location of the buffers; and
(c) Planting plan for buffers; and
(d) Identify all required wetland management activities;
(4) For all stream modifications, the following shall be submitted:
(a) A plan and profile of the existing and proposed channel; and
(b) Supporting calculations for channel width, depth, sinuosity, riffle locations and similar features.
(c) If the development will have a wetland impact, the requirements of this subchapter shall be met.
(Ord. 2019-03, passed 4-15-2019)
The permitee is required to submit record drawings of all permitted stormwater facilities. The record drawings shall be signed and sealed by a professional engineer, who shall state that the project as constructed is substantially in conformance with the development as permitted.
(Ord. 2019-03, passed 4-15-2019)
(A) The Village Administrator shall have the authority to approve or deny applications for stormwater management permits requested pursuant to this subchapter.
(B) Within three weeks after being served with the permit or notice that the permit has been denied, the applicant may appeal the terms or denial of the permit to Village Board. The appeals shall be made by filing a notice thereof with the Village Clerk, specifying the specific provisions appealed and the grounds therefor. The Village Board may conduct a hearing on the appeal not more than 60 days after the filing of the notice of appeal. Notice of the hearing shall be served upon the applicant.
(C) Within 30 days of the conclusion of the hearing, the Village Board shall decide whether to affirm or reverse, in whole or in part, the terms or denial of the permit. The decision of the Village Board shall be in writing and shall include the specific findings and conclusions supporting its determination. A copy of this decision and the order shall be served upon the applicant.
(Ord. 2019-03, passed 4-15-2019)
The village may, upon 30 days’ notice and approval to the owner or occupant, enter upon any lands or waters within the village for the purpose of inspecting and/or maintaining any stormwater facilities or causing the removal of any obstruction to an affected watercourse.
(Ord. 2019-03, passed 4-15-2019)
Any development having a stormwater management permit may be periodically inspected by the village, or authorized agent, to ensure that the management plan has conformed to and is being maintained in accordance with this subchapter and the terms and conditions of the stormwater management permit.
(Ord. 2019-03, passed 4-15-2019)
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