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Kane County Stormwater Technical Manual

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Kane County Stormwater Technical Manual STORMWATER TECHNICAL MANUAL COUN NE T A Y S K E T E O T R T I M KANE COUNTY W M A M T O E C R M T A E N N A G E M COUN NE T A Y S K E T E O T R T I M W M A M T O E C R M T A E N N A G E M INTRODUCTION ....................................................................................................... 3 PURPOSE .............................................................................................................. 3 ORGANIZATION .................................................................................................... 4 PART 1 – TECHNICAL GUIDANCE .......................................................................... 5 ARTICLE II - STORMWATER MANAGEMENT PERMIT SUBMITTAL REQUIREMENTS .................................................................................................. 6 § T9-28 General Requirements ........................................................................ 6 ARTICLE III - EROSION AND SEDIMENT CONTROL ...................................... 7 § T9-58 Applicability ......................................................................................... 7 § T9-59 Erosion and Sediment Control ............................................................ 7 ARTICLE IV – REQUIREMENTS FOR STORMWATER MANAGEMENT ........... 15 § T9-81 General Information .......................................................................... 15 § T9-82 General Stormwater Requirements ................................................... 28 § T9-83 Site Runoff Requirements ................................................................. 28 ARTICLE V – REQUIREMENTS FOR STORMWATER MITIGATION / BEST MANAGEMENT PRACTICES (BMPS) AND WATERSHED BENEFIT MEASURES ............................................................................................................................. 65 § T9-107 Requirements for Stormwater Mitigation / BMPs ........................... 65 § T9-108 Requirements for Watershed Benefit Measures .......................... 173 ARTICLE VI – REQUIREMENTS FOR FLOOD HAZARD AREAS AND BUILDING PROTECTION STANDARDS ....................................................... 178 § T9-134 Statewide and Regional Permits .................................................. 178 § T9-135 Floodplain Management .............................................................. 178 § T9-136 Floodplain, Regulatory Floodplain, Base Flood Elevation (BFE) and Regulatory Floodway Locations and Standards.............................................. 178 § T9-139 Building Protection Standards ..................................................... 180 § T9-141 Compensatory Storage Volume Standards ................................. 186 § T9-142 Floodway Standards .................................................................... 190 § T9-144 Bridge and Culvert Standards ...................................................... 195 ARTICLE VII – REQUIREMENTS FOR WETLANDS, LINEAR WATERCOURSES, NON-LINEAR WATERBODIES, BUFFERS AND MITIGATION ......................... 197 § T9-168 General ........................................................................................ 197 § T9-169 Requirements for Wetland Delineation ........................................ 197 § T9-170 Mitigation Required ...................................................................... 201 § T9-171 Mitigation to Be Local .................................................................. 205 § T9-172 Mitigation Requirements .............................................................. 205 § T9-173 Wetland Mitigation Plan ............................................................... 207 § T9-174 Mitigation Performance Standards ............................................... 209 § T9-175 Mitigation Monitoring .................................................................... 211 § T9-177 Buffer Requirements .................................................................... 212 § T9-179 Fee-in-Lieu of Wetland Mitigation ................................................ 226 § T9-180 Wetland Submittal ........................................................................ 226 ARTICLE VIII – PERFORMANCE SECURITY ................................................... 229 ARTICLE IX – LONG-TERM MAINTENANCE ................................................... 230 Kane County Technical Guidance Manual § T9-233 Incorporation of Long-Term Maintenance of Stormwater Facilities 230 ARTICLE XI – ENFORCEMENT AND PENALITIES .......................................... 235 § T9-286 Required Inspections ................................................................... 235 PART 2 – FORMS AND REFERENCE DOCUMENTS .......................................... 236 FORMS AND REFERENCE DOCUMENTS ....................................................... 237 Declaration of Restriction and Covenant for Linear Watercourse, Non-Linear Waterbody, Wetland and Wetland Buffer Areas ............................................. 238 Declaration of Restriction and Covenant for Category I Stormwater Mitigation/Best Management Practices (BMPs) .............................................. 241 Kane County Technical Guidance Manual INTRODUCTION The Kane County Stormwater Technical Guidance Manual (Manual) is, as the name suggests, a technical guide to provide developers and applicants assistance in complying with the Stormwater Ordinance and the technical requirements of a stormwater permit application. PURPOSE The purpose of the Technical Guidance Manual is to supplement the Kane County Stormwater Ordinance (Ordinance) by providing background, detail, and intent of the technical requirements in the Ordinance. This manual contains discussion, tables, figures and exhibits covering most of the topics found in the Ordinance to assist the applicant in preparing a complete Stormwater Permit Application. The examples illustrated in this Manual are general and attempt to cover the most common requirements. In practice there will be situations that arise in the design of a development that will not be directly related to one of the examples in this manual. The concepts illustrated can be applied to a variety of developments. The Manual is linked directly to the Kane County Stormwater Management Ordinance by using the same Section numbers as those contained in the Ordinance, with a “T” added to the number. The Manual is to facilitate implementation and provide guidance necessary to achieve the objectives and standards of the Ordinance. This document has no authority to mandate new criteria and provides a conservative approach for complying with the intent and letter of the criteria. Other techniques may exist that will meet the criteria with less effort or at a lower cost. The applicant accepts the burden of demonstrating the technical adequacy of the development design and is completely responsible for conformance with the criteria of the Ordinance. The different technical requirements are further defined in this Manual by use of charts, tables and example problems. Kane County Technical Guidance Manual 3 ORGANIZATION The Manual is comprised of two parts: Part 1 − Technical guidance covering stormwater management criteria, floodplain criteria and permit application requirements; and Part 2 − Additional resources plus appendices. Kane County Technical Guidance Manual 4 PART 1 – TECHNICAL GUIDANCE Kane County Technical Guidance Manual 5 ARTICLE II - STORMWATER MANAGEMENT PERMIT SUBMITTAL REQUIREMENTS § T9-28 General Requirements To determine if a Stormwater Management Permit is required for a particular development, the developer should use the worksheet on the Kane County website. In order to determine if the project is in or near the floodplain the developer must show the project location on the Flood Insurance Rate Map (FIRM), published by the Federal Emergency Management Agency (FEMA). Many of the FIRMs published by FEMA are from the early 1980’s and have been restudied and revised. Therefore, the developer should request from the community or county the latest FIRM for the project area. Each community is responsible for maintaining the latest set of FIRMs for their jurisdictional area. In order to determine if the project is in or near the developer must show the project location on Kane County ADID and National Wetland Inventory maps. These maps may be found at the links below: ADID: http://dewprojects.countyofkane.org/adid/index.htm NWI: https://www.fws.gov/wetlands/data/mapper.html It is important to note that not all wetlands are identified by these maps. An on- site wetland delineation may be required by a Qualified Wetland Specialist to determine the presence or absence of wetlands on or within 100 ft of the Site. The Ordinance includes exceptions from the necessity of obtaining a Stormwater Management Permit. Refer to Section 9-28 for the list. Developments that do not require a Stormwater Management Permit are not excluded from obtaining all other appropriate stormwater management related approvals from federal, state and regional authorities. All Developments must provide Erosion and Sedimentation Control. Kane County Technical Guidance Manual 6 ARTICLE III - EROSION AND SEDIMENT CONTROL Erosion and sedimentation are naturally occurring geological phenomena. Land development activities have initiated more drastic, undesirable and damaging alterations in the natural cycle by accelerating the erosion – sedimentation process. The original natural vegetative cover of prairie grasses, trees and shrubs allowed only a minimal amount of soil to be eroded. But as soon as cover was disturbed,
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