LID CASE STUDY DESIGN WORKSHOP EXAMPLE 2 MIXED USE ... · PDF fileby: marty wanielista and...
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B Y : M A R T Y WA N I E L I S T A A N D E R I C L I V I N G S T O N
LID CASE STUDY DESIGN WORKSHOP
EXAMPLE 2
MIXED USE DEVELOPMENT PROJECT
August, 2016
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ACKNOWLEDGEMENTS
• The Low Impact Design BMP workshops were presented on August 24
and 25, 2016 at the Escambia County Central Office Complex in
Pensacola.
• The Escambia County LID BMP Manual and the LID BMP Workshops
were funded in part by a Section 319 Nonpoint Source Management
Program Implementation grant from the U.S. Environmental Protection
Agency through an agreement/contract with the Nonpoint Source
Management Section of the Florida Department of Environmental
Protection.
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MIXED USE REDEVELOPMENT
Existing Site
• 4.8 acre high intensity commercial shopping center
• 2 buildings, one fast food restaurant, auto sales office and lot
Redevelopment Proposal 1 – Conventional LU/stormwater management
• Commercial and restaurant with surface parking
• Onsite stormwater retention basin
Redevelopment Proposal 2 – Mixed use with LID stormwater
• Mix of commercial, office and townhouse dwellings
• Mix of LID BMPs
Level of Treatment – Impaired water body with TMDL
• Net improvement = post-development < pre-development – 10%
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MIXED USE REDEVELOPMENT
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MIXED USE REDEVELOPMENT ORIGINAL SITE AND STORMWATER
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MIXED USE CONVENTIONAL REDEVELOPMENT
AND STORMWATER MANAGEMENT
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MIXED USE ALTERNATIVE REDEVELOPMENT
AND LID STORMWATER MANAGEMENT
What combination of LID BMPs do you want to use for stormwater treatment?
• Disconnect impervious area
• Florida-friendly landscaping
• Rainfall Interception trees
• Retention basin
• Rain garden (bioretention)
• Swales
• Pervious pavement
• Greenroof with cistern
• Rainwater harvesting
• Biofiltration systems
• Tree wells
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MIXED USE ALTERNATIVE REDEVELOPMENT
AND LID STORMWATER MANAGEMENT
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MIXED USE REDEVELOPMENT
STORMWATER COMPARISONS
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MIXED USE REDEVELOPMENT
STORMWATER TREATMENT COMPARISONS
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MIXED USE REDEVELOPMENT
COST COMPARISONS
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MIXED USE REDEVELOPMENT
ADDITIONAL BENEFITS
• Required load reductions were met with LID BMPs
• LID BMP Treatment Train included 0.42 acre rain garden
integrated into landscaping with 0.40 acre pervious pavement
and pavers, over 15 tree wells with 8 serving as interceptor
trees.
• Florida-friendly landscaping provides additional 3% TN load
reduction.
• Development density increased with LID BMP option, partly
from using Mixed Zoning and partly from the LID BMPs.
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MIXED USE REDEVELOPMENT
ADDITIONAL BENEFITS
• Required load reductions were met with LID BMPs
• LID BMP Treatment Train included 0.42 acre rain garden
integrated into landscaping with 0.40 acre pervious pavement
and pavers, over 15 tree wells with 8 serving as interceptor
trees.
• Florida-friendly landscaping provides additional 3% TN load
reduction.
• Development density increased with LID BMP option, partly
from using Mixed Zoning and partly from the LID BMPs.
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MIXED USE CASE STUDY - PENSACOLA RESULTS
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MIXED USE
CASE STUDY
PENSACOLA
WATERSHED
DATA
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MIXED USE CASE STUDY - PENSACOLA RESULTS
PERVIOUS PAVEMENT
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MIXED USE CASE STUDY - PENSACOLA RESULTSTREE WELLS
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MIXED USE CASE STUDY - PENSACOLA RESULTSRAIN GARDENS
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MIXED USE CASE STUDY - PENSACOLA RESULTS