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Presented by:Nigel D. Lewis, E.I.
Ken Watson, Ph.D, C.P.H.July 8, 2015
Low Impact Development and Water Quality Improvement
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Overview
Definition of Low Impact Development (LID)
LID BMPs
Case Study: Rogers Park LID Project
Expedited Permitting
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What Is LID?
LID is the practice of minimizing environmental impact and creating a stormwater plan that mimics pre-development hydrology.
Stormwater Management Best Management Practices (BMPs):
• Non-Structural
• Structural
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STORMWATER MANAGEMENTBEST MANAGEMENT PRACTICES
MINIMIZING ENVIRONMENTAL IMPACT(also known as)
Conservation Site DesignSustainable Site Development
Sustainable Urban Drainage Systems (SUDS)Green Infrastructure
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What Is LID?
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Low Impact Development Goal
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Development Impacts
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DIS
CH
ARG
E O
R
POLL
UTA
NT
LOAD
AFTER DEVELOPMENT
BEFORE DEVELOPMENT
TIME
Industrial Development – 10x’s More!
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LID BMPs – Non-Structural BMPs
Protect Sensitive Areas Cluster Development Reduce Imperviousness Stormwater Disconnection Minimize Disturbance and Compaction Protect Flow Pathways
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LID BMPs – Structural BMPs
Bioretention/Bioinfiltration Cells (Rain Gardens) Planter Boxes Vegetated Swales and Bioswales Detention Basins, Enhanced/Naturalized
Stormwater Ponds, and Wetlands Native Landscaping Exfiltration and Infiltration Permeable Pavement and Green Streets Vegetated Roofs and Walls Cisterns, Water Harvesting and Reuse 8
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Case Study - Rogers Park
Insert global aerial
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Rogers Park Setting
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Rogers Park Site Photos
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Rogers Park LID PROJECT
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Parking Area – Source Removal
DIRECTLY CONNECTED MULTI-COMPONENTIMPERVIOUS AREA EXFILTRATION SYSTEM 13
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Parking Area – Enhanced Infiltration
DIRECTLY CONNECTED MULTI-COMPONENTIMPERVIOUS AREA EXFILTRATION SYSTEM 14
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Protect Sensitive Areas – WWR (OFW)
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DIRECTLY CONNECTED MULTI-COMPONENTIMPERVIOUS AREA EXFILTRATION SYSTEM
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Bio Cell
DIRECTLY CONNECTED MULTI-COMPONENTIMPERVIOUS AREA EXFILTRATION SYSTEM
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Boat Ramp
DIRECTLY CONNECTED MULTI-COMPONENTIMPERVIOUS AREA EXFILTRATION SYSTEM 17
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Rogers Park LID PROJECT
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Load Reduction
190
1
10
100
1,000
10,000
Suspended Solids(total)
Phosphorus (total) Nitrogen (total) Biochemical OxygenDemand
Lead Copper
Estim
ated
Ann
ual L
oad
(Pou
nds /
Yea
r)
Pre Project Post Project
Source: Hernando County (2015)
96%
50%
31%
30%
79% 69%
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Permitting
Individual ERP – slow process
Expedited by a “10/2” Permit
General Permit -- granted by Florida Statute 403-814(12)
For construction of stormwater management systems that meet certain criteria
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What Qualifies for a 10-2 permit?
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Work Area < 10 ac.Impervious Surface < 2 ac. CONVEYANCES
< 24” dia.
NO WETLAND OR SURFACE WATER IMPACT
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10/2 Permit Saves You Time
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US ARMY CORPS PERMIT
SELF CERTIFICATION
APPLICATION FEE
AGENCY STAFF
REVIEW
PROJECT COMPLIANCE INSPECTION
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National LID Websites
LID Centerhttp://www.lowimpactdevelopment.org/
LID Center Urban Design Toolshttp://www.lid-stormwater.net/index.html
US Environmental Protection Agencyhttp://water.epa.gov/polwaste/green/index.cfm
Stormwater BMP Databasehttp://www.bmpdatabase.org/index.htm
Center for Watershed Protection – Stormwaterhttp://www.cwp.org/2013-04-05-16-15-03/stormwater-management
Stormwater Centerhttp://www.stormwatercenter.net/
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National LID Websites Cont.’d
Stormwater Management Life-Cycle Costs(capital and maintenance)
http://www.werf.org/bmpcost
Stormwater Management Life-Cycle Costs(land, capital, engineering, administration, maintenance, and replacement)
http://www.udfcd.org/downloads/software/BMP-REALCOST_v1.0.zip
Green Values Calculator(compare LID to conventional costs)
http://greenvalues.cnt.org/national/calculator.php24
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Florida LID Websites
IFAS Florida Low Impact Developmenthttp://fyn.ifas.ufl.edu/lowimpactdev.htm
Sarasota County Low Impact Developmenthttps://www.scgov.net/WaterServices/Pages/LowImpactDevelopment.aspx
Martin County Stormwater Design Toolkithttp://www.martin.fl.us/web_docs/cdd/web/xx_Stormwater_Report.pdf
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Questions? HSW Contacts:Nigel Lewis, E.I.(813) [email protected]
Dean Mades, P.E.(941) [email protected]
Don Carpenter, Ph.D., P.E., LEED AP(248) [email protected]
Ken Watson, Ph.D, C.P.H.(813) [email protected]
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