1. 1437 SOUTH BOULDER AVE., SUITE 1080  TULSA, OKLAHOMA 74119  918.392.5620 (P) 918.392.5621 (F)  WWW.MESHEKENGR.COM Garnett Regional Detention Facility: A Success Story In Managing NAI With Competing Interests Brandon Claborn, P.E., CFM

2. CITY OF OWASSO, OK  Location – 11 Miles Northeast of Tulsa, OK  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

3. RANCH CREEK BASIN

4. DRAINAGE BASIN  Ranch Creek – Tributary A  344 Acres to Proposed Pond

5. 1994  1994

6. 2002  2002

7. 2004  2004

8. 2006  2006

9. 2008  2008

10. EXISTING PROBLEMS  Flooding Downstream of Site

11. GOALS FOR DETENTION  Reduce Flooding Downstream  Full Development Upstream  Remove Some Existing Ponds  Sell City Owned Property  Protect Wildlife Habitat  Enhance Quality of Life

12. COMPTETING INTERESTS  Development versus Mitigation  USACOE versus OKDEQ & EPA  Construction Costs: Developer/City  Park versus Flood Control  Maintenance versus Wetland/Habitat

13. DEVELOPMENT PRESSURE  118 Acres of Undeveloped Property

14. FLOODPLAIN MITIGATION  Additional Competing Interests  More Frequent versus Less Frequent Floods

15. PERMITTING ISSUES  CLOMR  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

16. CONSTRUCTION COSTS  Sell Existing Detention Facilities  Fee In Lieu of Detention  Additional City Planning Required  Negotiate Purchase of Property

17. GENERAL SITE ISSUES  Neighborhood Meeting  Public Meeting During Design Phase –Local Residents Expectations  Coordination With City Departments –Upgrade Sanitary Sewer –Maintenance Access –Security (Police) –Stormwater Quality

18. SUMMARY/RECOMMENDATIONS  Floodplain Management – Developing With 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

19. 1437 SOUTH BOULDER AVE., SUITE 1080  TULSA, OKLAHOMA 74119  918.392.5620 (P) 918.392.5621 (F)  WWW.MESHEKENGR.COM Questions? Brandon Claborn, P.E. CFM Project Manager/Associate Principal bclaborn@meshekengr.com