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

CIT

Y O

F O

WA

SS

O, O

K 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

RA

NC

H C

REEK

BA

SIN

DR

AIN

AG

E B

AS

IN Ranch Creek – Tributary A

344 Acres to Proposed Pond

19

94

1994

20

02

2002

20

04

2004

20

06

2006

20

08

2008

EX

ISTIN

G P

RO

BLEM

S Flooding Downstream of Site

GO

ALS

FO

R D

ETEN

TIO

N Reduce Flooding Downstream

Full Development Upstream

Remove Some Existing Ponds

Sell City Owned Property

Protect Wildlife Habitat

Enhance Quality of Life

CO

MP

TETIN

G IN

TER

ES

TS

Development versus Mitigation

USACOE versus OKDEQ & EPA

Construction Costs: Developer/City

Park versus Flood Control

Maintenance versus Wetland/Habitat

DEV

ELO

PM

EN

T

PR

ESS

UR

E 118 Acres of Undeveloped Property

FLO

OD

PLA

IN M

ITIG

ATIO

N Additional Competing Interests

More Frequent versus Less Frequent Floods

Frequency Existing Proposed Reduction1 169 160 6%2 270 210 22%5 480 295 39%10 590 330 44%25 750 390 48%50 845 815 4%100 960 745 22%500 1425 1390 2%

40%PMF 3800 3455 9%

Peak Flow Rate (cfs)

PER

MIT

TIN

G IS

SU

ES

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

CO

NS

TR

UC

TIO

N C

OS

TS

Sell Existing Detention Facilities

Fee In Lieu of Detention

Additional City Planning Required

Negotiate Purchase of Property

GEN

ER

AL S

ITE IS

SU

ES

Neighborhood Meeting

Public Meeting During Design Phase– Local Residents Expectations

Coordination With City Departments– Upgrade Sanitary Sewer

– Maintenance Access

– Security (Police)

– Stormwater Quality

SU

MM

AR

Y/R

EC

OM

MEN

DATIO

NS

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

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. CFMProject Manager/Associate Principal

bclaborn@meshekengr.com