wildcat creek watershed mitigation through …wildcat creek watershed working group working group...
TRANSCRIPT
WILDCAT CREEK WATERSHED MITIGATION THROUGH PARTNERSHIPS
Chad Bunger, AICP, CFM, Senior PlannerRob Ott, P.E., Director of Public Works
The Back Story Significant flooding history
•1914•1915•1941•1951•1965
•1970•2007•2010•2011* Riley Co. FIS
2 Consecutive Years= Same Flooding
June 6, 2011 Wildcat Creek Flood Event
June 6, 2011 Wildcat Creek Flood Event
June 6, 2011 Wildcat Creek Flood Event
Wildcat Creek Watershed Working Group Working group was formed in July, 2011
6 sub‐committees Grants and Funding Sources Detention & Watershed Development & Freeboard Research & Data Collection Debris Mitigation & Enforcement Training & Education
Assisted by city, county, state & federal professional staff
Working Towards Risk Reduction
Silver Jackets Pilot Project Future Conditions Mapping Higher Standard Floodplain Regulation Community Rating System
11
What is ?Silver Jackets is a program which the US Army Corps of Engineers uses to do collaborative work with federal, state and local agencies create an interagency team at the state level to develop and implement solutions to state natural hazard priorities.
The Silver Jackets Program provides a formal and consistent strategy for an interagency approach to planning and implementing measures to reduce the risks associated with natural hazards.
Pilot Project Details
Cost sharing of 3 stream gauges Riley County Ft. Riley (DOD) City of MHK NWS USGS USACE
Pilot Project Details
Three stream gauges Increased accuracy for time of concentration Increase accuracy on flow rates
National Weather Service Forecast Point Improve Emergency Response Time and Level Increased Public Awareness
q
Pilot Project Details
Cost sharing of 3 stream gauges National Weather Service Forecast Point AHPS website
Wildcat Creek Floodplain Management Plan
Section 3 – Goals and Objectives Goal #1: Develop a collaborative multi‐jurisdictional approach
towards floodplain management to address the flooding concerns and impacts in the Wildcat Creek Watershed.
Goal #2: Proactively manage and reduce flood risk along Wildcat Creek and its tributaries to protect life and property.
Goal #3: Protect and preserve the natural riparian corridor environment to enhance habitat connectivity, water quality, erosion and sediment management, bank and channel stabilization, and provide compatible recreational opportunities.
Goal #4: Obtain a balance between development needs and the proper functions of the floodplain within the Wildcat Creek Watershed.
Goal #5: Improve public understanding of the flood risks within the Wildcat Creek Watershed.
Document can be found atwww.cityofmhk.com/fmp
Future Conditions MappingTale of 2 Floodplains
Higher Standard Floodplain Regulations
Detention & Post‐Construction BMP Requirements Pre Development = Post Development runoff for 50%, 10% & 1% year events.
Post Construction BMP ~ Multiple Phase 2 Cities within the State of Kansas adopted a uniform Post Construction BMP Manual.
Manual can be found at http://www.cityofmhk.com/DocumentCenter/Index/816
New Definition of BFE
FLOOD PROTECTION ELEVATION (FPE) means the elevation to which all structures located within the Community Special Flood Hazard Area or FEMA Special Flood Hazard Area must be elevated or floodproofed if non‐residential. Where the Community Base Flood Elevation is provided, the elevation shall be that elevation plus one (1) foot of freeboard. Where the Community Base Flood Elevation is not provided, Flood Protection Elevation shall be the FEMA Base Flood Elevation plus two (2) foot of freeboard.
Compensatory Storage
Any development, including fill, new construction, substantial improvement or other encroachment within the Community Special Flood Hazard Area shall not result in an increase in the Community Base Flood Elevation that is greater than one tenth of a foot (0. 1’). The flood elevation shall be documented and certified by a registered professional engineer. In the event that the development creates a net rise in the Community Base Flood Elevation that is greater than one tenth of a foot (0.1’), compensatory storage shall be provided, as followed:
Compensatory Storage (cont.)
Floodplain along a stream = at least 1.2 times the volume of floodplain storage lost or displaced
Floodplains in low‐lying areas = at least 1 times the volume of floodplain storage lost or displaced
Compensatory storage shall be located opposite or adjacent to the fill areas
Compensatory storage areas shall drain freely A drainage easement & restrictive covenant shall be
provided on the property An as‐built survey shall be provided once project is
completed. Only applies to developments over an acre
Existing Development
Cumulative Substantial Damage & Improvements‐Damage – 2 events in 10 years that exceed average
of 25%.‐ Improvements –Any expansion of the footprint of
the structure over its life that equals or exceeds 50%
* Must conform to FPE or get an FPE Exception
Community Rating System
Accepted into program in May, 2013 Level 8 = 10% discount on premiums Looking to substantially increase our level in the upcoming years
Takeaways from the Process
Collaboration is key! Flooding is not just a local entity problem
Seek out the experts
Think outside the box
Harness Political Will
Looking Ahead
Adopting FIRMs with Future Conditions Adopting Higher Standard Floodplain Regulations
Big Blue River Project with local, state & federal agencies Similar project but is including a mitigation elements
Public Outreach Plan BIG POINTS FOR CRS!
Check us out!
Twitter@MHK_Com_Dev
FacebookKnowYourFloodRiskMHK
www.KnowYourFloodRiskMHK.com