northeastern illinois development and kane county needs...(article vi.c.13.4) 1:1 ratio (55.021.f)...
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KANE COUNTY Brolley, Berman, Burns, Kaptain, Pickett, Michels
Hernandez, Silva, Martin, Allan, Kojzarek, Lenert
Ex-Officio: Frasz, Lauzen & O’Connor
STORMWATER MANAGEMENT PLANNING COMMITTEE
TUESDAY, MARCH 13, 2018
County Board Room Agenda 4:00 PM
Kane County Government Center, 719 S. Batavia Ave., Bldg. A, Geneva, IL 60134
Kane County Page 1
1. Call to Order
2. Approval of Minutes: April 11, 2017
3. Public Comments
4. Approval: Stormwater Management Planning Committee Ex-Officio Replacement
5. Approval: Technical Advisory Committee Replacement
6. Presentation: Engineering Resources Associates (ERA) Power Point
A. Project Back Ground
B. Project Goals
C. What’s Been Done So Far
D. TAC Recommendations
E. What’s Next
F. Project Schedule
7. New Business
8. Next Meeting: June 12, 2018 @ 4:00 pm
8. Adjournment
COUNTY OF KANE
KANE COUNTY DIVISION OF ENVIRONMENTAL & WATER RESOURCES Kenneth N. Anderson, Jr Director Jodie L. Wollnik, P.E., CFM Assistant Director
County Government Center 719 Batavia Avenue Geneva, IL 60134 Phone: (630) 232-3497 Fax: (630) 208-3837 e-mail: [email protected] website: http://www.co.kane.il.us
TO: Stormwater Management Planning Committee FROM: Kenneth N. Anderson, Jr – Director DATE: March 6, 2018 RE: Appointment of Ex-Officio Municipal Member of Stormwater Management Planning Committee Mayor Irvin of Aurora has recommended Deputy Mayor Chuck Nelson for appointment as Ex-Officio Member replacing Robert J O’Connor who did not run for reelection in 2017. We recommend approval of the appointment of Deputy Mayor Chuck Nelson as Ex-Officio Member of the Stormwater Management Planning Committee.
COUNTY OF KANE
KANE COUNTY DIVISION OF ENVIRONMENTAL & WATER RESOURCES Kenneth N. Anderson, Jr Director Jodie L. Wollnik, P.E., CFM Assistant Director
County Government Center 719 Batavia Avenue Geneva, IL 60134 Phone: (630) 232-3497 Fax: (630) 208-3837 e-mail: [email protected] website: http://www.co.kane.il.us
TO: Stormwater Management Planning Committee FROM: Kenneth N. Anderson, Jr – Director DATE: March 6, 2018 RE: Appointment of Technical Advisory Committee Voting Alternates The City of Batavia has requested the replacement of Scott Haines as their voting alternate with Rahat Bari. The City of St. Charles has requested the replacement of Chris Bong as their voting alternate with Monica Hawk. We recommend approval of the appointment of Rahat Bari and Monica Hawk as voting alternates on the Kane County Stormwater Technical Advisory Committee.
Kane County Stormwater
Ordinance Revisions
John Mayer & Erin Pande
Engineering Resource Associates, Inc. March 13, 2018
Where We Have Been and
Where We are Going
Presented to the Kane County Stormwater Management
Planning Committee
Stormwater Management
Ordinance Background➢ SMO adopted in 2001
Effective 2002
Minor revisions in 2009
➢ Countywide Enforcement
Certified Communities
Non-Certified Communities
Unincorporated Kane County
Project Goals
➢ Update existing SMO to provide:
Consistency with Statewide & Federal Regulations
Streamlined permitting
NPDES & BMP requirements
Consistency with County 2040 Plan & Green Infrastructure Plan
➢ Engage Certified Communities & Stakeholders
➢ Update Technical Reference Manual (TRM)
What’s Been Done So Far?
➢ Website
www.kanecountystormwaterupdate.org
➢ Identify Known Issues
Certified Community Input
➢ Review Historic Documents
What’s Been Done So Far?
➢ Agricultural Subcommittee Meetings
➢ Technical Advisory Committee (TAC)
Meetings
Stormwater Management
Floodplain/Floodway
Wetlands/Buffers
What’s Been Done So Far?
➢ Comparison to neighboring counties
StandardKane County
(2001)
DuPage County
(2013)
Cook County
WMO (2014)
Lake County
(2015)
McHenry County
(2016)
Will County
(2004)
Compensatory
Storage In
Depressional
Storage Areas
1:1 Ratio
(9-27.G)
1:1 Ratio
(15-81.D.1)
Exemptions:
<640 acres & total
fill <200 CY
(15-81.D.1 to D.2)
Do not exceed
existing release
rates
Non-Riverine
Regulatory
Floodplain:
1:1 Ratio
(704.02)
1:1 Ratio &
based on critical
duration storm
(Article VI.C.13.4)
1:1 Ratio
(55.021.F)
Compensatory
Storage in
Floodplain &
Flood Prone
Areas
Riverine:
1.5:1
Non-Riverine adj
to lake: 1:1 Ratio
1.5:1 Ratio
Exemptions:
flood protection of
ex. building for
volume displaced
by building &
within 10’ of
building; <640
acres & floodplain
reduced by <0.5%
at all cross
sections; <640
acres & total fill
<200 CY
(15-81.D.1 to D.2)
1.1:1 Ratio
(602.9)
Exemptions:
Flood proofing of
ex. Building
(602.11)
1.2:1 Ratio
(704.01)
1.2:1 Ratio for
development
partially on-site
with more than
10% of the BFE
surface area on-
site
(704.03)
1.5:1 ratio w/o as-
built;
1.2:1 ratio w/ as-
built;
1:1 ratio for
roadway
development
Exemptions:
<=5CY of fill,
replacement of
onsite waste
disposal systems
& flood proofing
w/i 10’ of ex.
Buildings;
artificially created
storage
(Article VI.C.13.a
Table 7)
Riverine:
1:1 Ratio
Non Riverine:
1:1 Ratio
(55.063)
TAC Recommendations
Detention Triggers
➢ Existing: Zoning Based ➢ Proposed: Impervious Based
TAC Recommendations
Watershed Benefit Measures
➢ Existing: N/A
➢ Proposed: New Standard for
large, open space parcels &
agricultural properties
TAC Recommendations
Credit for Impervious Area
Removal
➢ Existing: N/A
➢ Proposed: New Standard
TAC Recommendations
Downstream Discharges
➢ Existing:
Ordinance is not clear how far downstream
should be analyzed for impacts from offsite
outfalls
➢ Proposed:
Consistent with Illinois Drainage Law
“Reasonable Use”
TAC Recommendations
Upstream Conveyance
➢ Existing:
Allows offsite tributary surface water to flow
through side yards into detention basins
➢ Proposed:
Require preventative design measures
and/or maintenance responsibilities to
address surface water from agricultural
areas into development
TAC RecommendationsFee-In-Lieu of Detention
➢ Existing:
Redevelopment
Mass Grading
➢ Proposed:
Redevelopment
Mass Grading
New Development
TAC RecommendationsSubstantial Damages in Floodway
➢ Existing:
Not allowed to replace,
reconstruct, repair or modify
➢ Proposed:
Allowed to replace, reconstruct,
repair or modify with same
outside building dimensions
Consistent with IDNR standards
TAC RecommendationsSubstantial Improvements in Floodway
➢ Existing:
Improvements and maintenance
cumulative since 2010
➢ Proposed:
Improvements remain cumulative
since 2010
• Examples: Kitchen & Bathroom
remodel
Maintenance items over previous
10-years
• Examples: Roofing, windows
replacement, painting, etc.
TAC Recommendations
1.5:1 Ratio
w/o modeling
• Keep current standard for projects not requiring detailed engineering studies
1.2:1 Ratio
w/ modeling
• Revise standard for projects providing updated engineering studies
1:1 Ratio
Restoration
• Revise standard for projects providing a watershed benefit measure
1:1 Ratio
Depressional Storage
• Same as current standard
1.5:1 Ratio
• Riverine Floodplain
1:1 Ratio
• Non-Riverine Floodplain
1:1 Ratio
• Depressional Storage Areas
Compensatory Storage
Existing Proposed
Compensatory Storage
Exemptions➢ Replacement of septic systems in
floodplain or floodway
➢ Agricultural dredged spoils in
floodplain
➢ Small amounts of fill to restore
subsided areas in floodplain
➢ Building structural members and
building materials for accessory
structures in floodplain
What’s Next?
➢ Reorganize ordinance sections
➢ Upcoming TAC Meetings Wetlands/Buffers (April 2018)
Best Management Practices (April 2018)
Sediment and Erosion Control (April 2018)
Administration, Enforcement, General Provisions (May 2018)
What’s Next?
➢ Stakeholder
Outreach
➢ Draft Ordinance
Language
➢ Reconvene TAC
Stakeholders
Municipalities & Certified
Communities
Watershed Groups
Environmental Groups
Local Developers
Roadway Agencies
Forest Preserve Districts
Park Districts
Schedule
2018 2019
Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb
TAC Meetings
Stormwater Management Committee Meeting
Draft Ordinance Language
County Board Meeting
Public Comments
Ordinance Adoption
Comments or Questions?