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