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
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.
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%
MIXED USE REDEVELOPMENT
MIXED USE REDEVELOPMENT ORIGINAL SITE AND STORMWATER
MIXED USE CONVENTIONAL REDEVELOPMENT
AND STORMWATER MANAGEMENT
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
MIXED USE ALTERNATIVE REDEVELOPMENT
AND LID STORMWATER MANAGEMENT
MIXED USE REDEVELOPMENT
STORMWATER COMPARISONS
MIXED USE REDEVELOPMENT
STORMWATER TREATMENT COMPARISONS
MIXED USE REDEVELOPMENT
COST COMPARISONS
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.
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.
MIXED USE CASE STUDY - PENSACOLA RESULTS
MIXED USE
CASE STUDY
PENSACOLA
WATERSHED
DATA
MIXED USE CASE STUDY - PENSACOLA RESULTS
PERVIOUS PAVEMENT
MIXED USE CASE STUDY - PENSACOLA RESULTSTREE WELLS
MIXED USE CASE STUDY - PENSACOLA RESULTSRAIN GARDENS
MIXED USE CASE STUDY - PENSACOLA RESULTS