Transcript Sr Design Presentation - Association of State Floodplain

Garnett Regional Detention Facility:
A Success Story In Managing NAI
With Competing Interests
Brandon Claborn, P.E., CFM
1437 SOUTH BOULDER AVE., SUITE 1080  TULSA, OKLAHOMA 74119  918.392.5620 (P) 918.392.5621 (F)  WWW.MESHEKENGR.COM
 Population
– 1990 – 11,151
– 2000 – 18,502
– 2008 – 37,328
 Recent Development
– 2400 Residential Lots 2002-2009
– Annual Retail Sales:
– $200 Million in 2000
– $550 Million in 2007
CITY OF OWASSO, OK
 Location – 11 Miles Northeast of Tulsa, OK
RANCH CREEK BASIN
 344 Acres to Proposed Pond
DRAINAGE BASIN
 Ranch Creek – Tributary A
1994
 1994
2002
 2002
2004
 2004
2006
 2006
2008
 2008
EXISTING PROBLEMS
 Flooding Downstream of Site
 Full Development Upstream
 Remove Some Existing Ponds
 Sell City Owned Property
 Protect Wildlife Habitat
 Enhance Quality of Life
GOALS FOR DETENTION
 Reduce Flooding Downstream
 USACOE versus OKDEQ & EPA
 Construction Costs: Developer/City
 Park versus Flood Control
 Maintenance versus Wetland/Habitat
COMPTETING INTERESTS
 Development versus Mitigation
DEVELOPMENT PRESSURE
 118 Acres of Undeveloped Property
 More Frequent versus Less Frequent Floods
Frequency
1
2
5
10
25
50
100
500
40%PMF
Peak Flow Rate (cfs)
Existing Proposed Reduction
169
160
6%
270
210
22%
480
295
39%
590
330
44%
750
390
48%
845
815
4%
960
745
22%
1425
1390
2%
3800
3455
9%
FLOODPLAIN MITIGATION
 Additional Competing Interests
 404 Permit
– On Site Meeting Prior to Design
– Second On Site Meeting – Initial Design
 Individual 404 Permit Application
– 100% On Site Mitigation
– 4:1 Ratio for Overall Wetland Habitat
 401 Certification (OKDEQ)
– Required Additional Off Site Mitigation
 Cultural Resources Investigation
 Oklahoma Historical Society
PERMITTING ISSUES
 CLOMR
 Fee In Lieu of Detention
 Additional City Planning Required
 Negotiate Purchase of Property
CONSTRUCTION COSTS
 Sell Existing Detention Facilities
 Public Meeting During Design Phase
– Local Residents Expectations
 Coordination With City Departments
– Upgrade Sanitary Sewer
– Maintenance Access
– Security (Police)
– Stormwater Quality
GENERAL SITE ISSUES
 Neighborhood Meeting
No Adverse Impact
– One Piece of the Puzzle
– Reducing Flooding Is the Easy Part
– Several Competing Interests
– Coordinate City Departments
– Comprehensive Planning Is Crucial
– Leverage Resources
– Work With Developers
– Identify Permitting Needs Early
SUMMARY/RECOMMENDATIONS
 Floodplain Management – Developing With
Questions?
Brandon Claborn, P.E. CFM
Project Manager/Associate Principal
[email protected]
1437 SOUTH BOULDER AVE., SUITE 1080  TULSA, OKLAHOMA 74119  918.392.5620 (P) 918.392.5621 (F)  WWW.MESHEKENGR.COM