kane county stormwater technical guidance manual - Kane County, IL

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KANE COUNTY STORMWATER TECHNICAL GUIDANCE MANUAL INTRODUCTION Purpose 1 Organization 2 PART 1 – TECHNICAL GUIDANCE ARTICLE 2 – REQUIREMENTS FOR STORMWATER MANAGEMENT § T200 General Requirements................................................................ 4 § T200(b) Site Runoff Storage Requirements ................................................................ 4 § T201 General Stormwater Requirements................................................................ 6 § T201(d) Overland Flow Paths................................................................6 § T201(e) Protection of Buildings................................................................ 8 § T201(f) Planning Principles ................................................................10 § T201(g) Depressional Storage ................................................................ 10 § T202 Site Runoff Requirements ................................................................ 11 § T202(a) Stormwater Facility Discharges ................................................................ 11 § T202(b) Minor Stormwater System Criteria................................................................ 15 § T202(c) Major Stormwater System Criteria................................................................ 15 § T202(d) Existing Sub-Surface and Surface Drainage Systems................................................................................................ 17 § T202(e) Design Runoff Rate................................................................18 § T202(f) Design Rainfall ................................................................................................ 18 § T202(g) Stormwater System Easements................................................................ 19 § T202(h) Flow Depths................................................................................................ 20 § T202(i) Diversions of Flow to Another Watershed................................ 20 § T202(j) Best Management Practices Requirements................................ 20 § T203 Site Runoff Storage Requirements (Detention) ................................ 23 § T203(a) Area of Disturbance ................................................................23 § T203(b) Release Rate................................................................................................ 23 § T203(c) Design Methods................................................................................................ 25 § T203(d) Existing Release Rate Less Than Allowable ................................ 31 § T203(e) Downstream Water Surface Elevations................................31 § T203(g) Retention Requirement................................................................ 31 Kane County Technical Guidance Manual Page No. 3 Page No. 4
Kane County Technical Guidance Manual Page No. § T203(h) Site Runoff Storage Facility Design Requirements................................ 39 § T203(i) Site Runoff Storage Facility Requirements Within the Regulatory Floodplain................................................................ 40 § T203(j) Requirements Within the Regulatory Floodway................................ 40 § T203(l) Off-Site Facilities................................................................ 40 § T203(m) Structures Built Across a Channel for Site Runoff Storage Facilities................................................................ 41 ARTICLE 3 – EROSION AND SEDIMENT CONTROL § T300(a) Site Planning................................................................................................ 43 § T300(a)(1) Phased Construction................................................................ 45 § T300(b) Standards and Specifications ................................................................ 47 § T300(c) General Requirements................................................................ 47 § T300(d) Extended Construction Shutdown Periods................................ 48 § T300(e) Hydraulic and Hydrologic Design Requirements................................ 48 § T300(f) “As Needed” Practices on the Plans................................ 49 § T300(g) Limitation on Site Disturbance ................................................................ 54 § T300(h) Sediment and Erosion Control Plan Requirements ................................ 54 § T300(i) Conveyance of Off-Site Flow................................................................ 57 § T300(j) Stockpiles ................................................................................................ 57 § T300(l) Construction Dewatering................................................................ 57 § T300(m) Protection of Public/Private Roadways ................................57 § T300(n) Temporary Stream Crossings ................................................................ 58 ARTICLE 4 – PROTECTION OF SPECIAL MANAGEMENT AREAS § T401 Disclaimer................................................................................................ 60 § T402 Statewide & Regional Permits ................................................................ 60 § T403 Floodplain Management................................................................ 61 § T404 Floodplain, Regulatory Floodplain, Base Flood Elevation (BFE) & Regulatory Floodway Locations ................................ 61 § T407 Building Protection Standards................................................................ 63 § T408 Non-Conforming Structures................................................................ 69 § T409 Lowest Opening ................................................................................................ 70 § T410 Compensatory Storage Volume Standards................................ 70 § T411 Floodway Standards................................................................73 § T412 Riverine Floodplain................................................................79 § T413 Bridge and Culvert Standards ................................................................ 80 § T414(a-c) Requirements for Wetland Delineation ................................81 § T414(d) Delineation Hierarchy ................................................................ 85 § T415 Mitigation to be Local................................................................ 86 § T416 Threatened and Endangered Species Consultation................................ 86 § T417 Wetland Preservation During Development................................ 86 43 60
Page 1: KANE COUNTY STORMWATER TECHNICAL GU
Page 5 and 6: ARTICLE 13 - FEE-IN-LIEU OF SITE RU
Page 7 and 8: No. Name LIST OF FIGURES Kane Count
Page 9 and 10: Organization The Manual is comprise
Page 11 and 12: ARTICLE 2 - REQUIREMENTS FOR STORMW
Page 13 and 14: applicant to provide retention volu
Page 15 and 16: § T201(e) Protection of Buildings
Page 17 and 18: § T201(f) Planning Principles Meet
Page 19 and 20: 1. Identify all points where runoff
Page 21 and 22: FIGURE 3 Detention Example (continu
Page 23 and 24: 3. Calculating overland flow paths
Page 25 and 26: soil tributary to the downstream sy
Page 27 and 28: purpose of the easement is for main
Page 29 and 30: In general: 1. Impervious surfaces
Page 31 and 32: FIGURE 5 Hydrologically Disturbed A
Page 33 and 34: TABLE 4 Huff Quartile Distributions
Page 35 and 36: FIGURE 6 Median Time Distribution o
Page 37 and 38: All runoff volumes shall be calcula
Page 39 and 40: The retention volume may be reduced
Page 41 and 42: FIGURE 9 Detention Configuration fo
Page 43 and 44: FIGURE 11 Detention Configuration f
Page 45 and 46: FIGURE 13 Separation for Subsurface
Page 47 and 48: § T203(i) Site Runoff Storage Faci
Page 49 and 50: etter information is submitted and
Page 51 and 52: Surface Erosion Factor Subsoil Eros
Page 53 and 54:
TABLE 7 Seed Mixtures For Temporary
Page 55 and 56:
§ T300(d) Extended Construction Sh
Page 57 and 58:
FIGURE 14A Sediment Control Practic
Page 59 and 60:
Figure 15A Soil Stabilization Pract
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§ T300(g) Limitation on Site Distu
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TABLE 8 Permanent Stabilization Pra
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must be cleaned before the end of e
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ARTICLE 4 - PROTECTION OF SPECIAL M
Page 69 and 70:
For projects where no Regulatory Fl
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Residential Buildings The Ordinance
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nonresidential), the flood insuranc
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FIGURE 18 Required Flood Protection
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§ T409 Lowest Opening Proposed str
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crossing. The floodplain downstream
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any revised floodway or will agree,
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Illinois Department of Natural Reso
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applicant will have to manually adj
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exception of the appropriate use re
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For all on-site wetlands with buffe
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Site: Kane County Stormwater Exampl
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§ T415 Mitigation to be Local All
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FIGURE 21 Linear and Water Body Buf
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TABLE 11 Linear Buffer Width Calcul
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FIGURE 22 Buffer Width Scenarios Ka
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FIGURE 23 Measurement Reference for
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ARTICLE 5 - STORMWATER MANAGEMENT P
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§ T502(a) Required Submittals If t
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An example of a narrative descripti
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) Buffer Requirements. The buffer r
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ARTICLE 6 - LONG-TERM MAINTENANCE T
Page 113 and 114:
90% of the slopes, as measured by a
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ARTICLE 7 - ENFORCEMENT AND PENALIT
Page 117 and 118:
§ T1500 General ARTICLE 15 - WETLA
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TABLE 14 Mitigation Requirements Mi
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etween wetland mitigation facilitie
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Director will reduce the wetland pe
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FORMS The following sheets contain
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KANE COUNTY STORMWATER MANAGEMENT P
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Identifier 2A 2B 2C 2D 2E 2F 2G 2H
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Identifier 4A 4B 4C 4C-1 4C-2 4C-3
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Identifier 5D-3 5D-4 5D-5 5D-6 5D-7
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Identifier Kane County Stormwater M
Page 137 and 138:
COMMUNITY CONTACT FOR STORMWATER MA
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CERTIFIED COMMUNITY FORM FOR EXEMPT
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INSPECTION CHECKLIST DURING CONSTRU
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DEVELOPER’S STATEMENT Right to Dr
Page 145 and 146:
APPENDICES Kane County Technical Gu
Page 147 and 148:
TABLE A2 Typical Roughness Coeffici
Page 149 and 150:
TABLE A2 (continued) Typical Roughn
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kane county stormwater technical guidance manual - Kane County, IL

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