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Transcript of Chapter 4 Integrating Site Design and Stormwater Management Frank X. Browne, Ph.D., P.E. F. X....
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Chapter 4Chapter 4Integrating Site Design Integrating Site Design
and Stormwater and Stormwater ManagementManagement
Frank X. Browne, Ph.D., Frank X. Browne, Ph.D., P.E.P.E.
F. X. Browne, Inc.F. X. Browne, Inc.
www.fxbrowne.comwww.fxbrowne.com
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PresentationPresentation
Overview of Low Impact Overview of Low Impact Development ConceptsDevelopment Concepts
Discussion of Chapter 4Discussion of Chapter 4 Case StudiesCase Studies
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Low Impact DevelopmentLow Impact Development
An innovative, ecosystem-An innovative, ecosystem-based approach to land based approach to land development and development and stormwater managementstormwater management
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Why We Need Low Impact Why We Need Low Impact DevelopmentDevelopment
Protect and ImproveProtect and Improve Water QualityWater Quality Watershed HydrologyWatershed Hydrology Fish and WildlifeFish and Wildlife
Reduce Infrastructure CostsReduce Infrastructure Costs Make Communities More Make Communities More
AttractiveAttractive
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Low Impact Development
Mimic Predevelopment Site Hydrology
Using Site Design Techniques that Store, Infiltrate, Evaporate and Detain
Stormwater Runoff
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“The difficulty lies not in the new ideas,
but in escaping from the old ones.”
John Maynard Keynes, 1936
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Conventional Low Impact
Functional Landscape DesignGood DrainageConventional
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Low Impact Low Impact Development Development
ObjectivesObjectives
Reduce Effective Reduce Effective Impervious AreaImpervious Area
Infiltrate StormwaterInfiltrate Stormwater Maximize Maximize
EvapotranspirationEvapotranspiration
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Low Impact Low Impact Development Planning Development Planning
ConceptsConcepts
A.A. Maintain/Improve Site HydrologyMaintain/Improve Site Hydrology
B.B. Think SmallThink Small
C.C. Control Stormwater at the SourceControl Stormwater at the Source
D.D. Use Natural , Nonstructural MethodsUse Natural , Nonstructural Methods
E.E. Create Multifunctional EnvironmentCreate Multifunctional Environment
Modified from Prince George County, MarylandModified from Prince George County, Maryland
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Chapter 4Chapter 4
Integrating Site Design Integrating Site Design and Stormwater and Stormwater Management Management
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SITE ANALYSIS
Background Site Factors
Site Factors Inventory
Site Factors Analysis
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Background Site FactorsDescribe hydrologic context and other natural elements
Chapter 93 stream use designation Special Protection Waters (EV, HQ) Fishery/Aquatic Life Use (WWF, CWF, TSF)
Chapter 303d/impaired streams Aquatic biota sampling Sensitive downstream areas (water supply
source) Location of any know downstream flooding Any Special Areas?
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Special Areas
Previously Mined AMD/AML areas Brownfields Source Water Protection areas Urban Areas Carbonate/Limestone Other
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Site Factors Inventory
Describe the existing developed features of the site, if any
Describe important natural features of site
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Describe the size and shape of the site
Special constraints/opportunities
Special site border conditions and adjacent uses
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Describe the existing developed features of the site, if any
Existing structures/structures to be preserved
Existing cover/uses Existing impervious areas Existing public sewer and water Existing storm drainage systems Existing on-site water and
wastewater
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Describe important natural features of site
Existing hydrology (drainage swales, intermittent, perennial)
Existing topography, contours, subbasins Soils on site – potential for infiltration Areas of vegetation (trees, scrub, etc) Special Value Areas Sensitive Areas PNDI areas or species
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Special Value Areas
Wetlands, hydric soils Floodplains/alluvial soils High quality woodlands, other
woodlands and vegetation Riparian buffers Naturally vegetated
swales/drainageways
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Sensitive Areas
Steep slopes Special geologic conditions
(limestone) Shallow bedrock (less than 2ft) High water table (less than 2ft)
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Site Factors Analysis
Characterize site constraints Wetlands Bog turtle habitat Streams and ponds
Characterize site opportunities\ Good soils Woodlands Riparian buffers
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Constraints and Opportunities
Avoid development on or near special and sensitive natural features
Place impervious areas on poor soils
Protect good soils – use for infiltration
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Using the site opportunities
Has a Potential Development Area been defined?
Does the proposed layout fit the constraints and opportunities of the site?
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MUNICIPAL INPUTSMUNICIPAL INPUTS Township Comprehensive Plan and
Zoning guidance
Township SLDO guidance and options
Township SLDO/stormwater requirements
Is useful interaction at sketch plan or even pre-sketch plan phases occurring?
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Township Comprehensive Plan and Zoning guidance
Guidance in Comprehensive Plan?
Existing Zoning District? Total number of units allowed? Type of units? Density of units?
Any allowable options?
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Township SLDO guidance and options
Performance standards for neo-traditional, village, hamlet planning?
Reduce building setbacks? Curbs required? Street width, parking requirements, other
impervious requirements? Cut requirements? Grading requirements? Landscaping requirements?
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Township SLDO/stormwater requirements
Peak rate and design storms Total runoff volume Water quality provisions Methodology requirements Maintenance requirements
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SITE DESIGN:SITE DESIGN:NON-STRUCTURAL BMPsNON-STRUCTURAL BMPs
Lot Concentration and Clustering Minimum Disturbance Impervious Coverage Reduction Disconnect/Distribute/
Decentralize Source Control
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Lot Concentration and Clustering Reduce individual lot size Concentrate/cluster lots Configure lots to incorporate
natural site characteristics Orient structures to fit natural
topography Minimize site disturbance
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Minimum Disturbance
Define disturbance zones for site Protect good soils Protect sensitive and special areas
Minimize total site compaction Maximize zones of open space and
greenways Consider re-forestation and re-
vegetation opportunities
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Impervious Coverage Reduction Reduce road widths and lengths Use Cul-de-sacs with vegetated
islands Reduce driveway length and width Reduce parking ratios and sizes Evaluate shared parking Use porous surfaces where
applicable Design single-side sidewalks
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Disconnect/Distribute/Decentralize Rooftop disconnection
Existing yard areas Existing vegetated areas/woods
Disconnection from storm sewers/street gutters Front/side yard opportunities Vegetated swales, rain gardens,
etc.
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SITE DESIGN:STRUCTURAL BMPs
Volume/Peak Rate Using Infiltration
Volume/Peak Rate Reduction Using Other Methods
Runoff Quality/Peak Rate Reduction
Site Restoration Testing Protocols
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Volume/Peak Rate Through Infiltration
Porous Pavement with Infiltration Beds Infiltration Basins Infiltration Trenches Rain Garden/Bioretention Dry Wells/Seepage Pits Vegetated Swales Vegetated Filter Strips Infiltration Berm/Retentive Grading
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Volume/Peak Rate Reduction – Other Methods
Vegetated Rooftops (Green Roofs)
Capture & ReuseCisternsRain Barrels
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Runoff Quality/Peak Rate Reduction Constructed wetland Wet pond/retention basin Dry extended detention basin
(Naturalized Basin) Water quality filters: Constructed
and Other Sand and sand/peat filters Multi-chamber catch basins and inlets
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Site Restoration for Stormwater
Riparian Buffer RestorationLandscape RestorationSoil Amendment/Restoration
Streambank Restoration
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Testing ProtocolsSoil Testing
Site Infiltration
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STORMWATER METHODOLOGYAND CALCULATIONS
Iterative Process Occurring Throughout Planning and Design to Maximize Non-Structural Practices
Strive to Minimize Stormwater Runoff Strive to Achieve Standards of
Comprehensive Stormwater Management
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DEVELOP COMPREHENSIVE STORMWATER
MANAGEMENT PLAN Has There Been Thorough Approach
To Use of Both Non-Structural and Structural BMPs? If not, what non-structurals and
structurals might be used? Should the building program be
modified?
What Related Benefits Are Being Achieved Through The Use of BMPs?
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Case StudyCase Study
Stony Creek Farms Age Stony Creek Farms Age Qualified Residential Qualified Residential
DevelopmentDevelopment
Homsher Hill, LLCHomsher Hill, LLC
Worcester Township, PennsylvaniaWorcester Township, Pennsylvania
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Proposed DevelopmentProposed Development
Age-Qualified CommunityAge-Qualified Community 209 Townhouses209 Townhouses ClubhouseClubhouse Day SpaDay Spa
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Site ConditionsSite Conditions
ForestedForested C and D SoilsC and D Soils Mild SlopesMild Slopes Intermittent StreamIntermittent Stream Natural Stream BufferNatural Stream Buffer
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GoalsGoals
Control 2-Year StormControl 2-Year StormPeak runoff ratesPeak runoff ratesRunoff volumeRunoff volumeWater qualityWater quality
Larger StormsLarger StormsControl peak runoff ratesControl peak runoff rates
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ObjectivesObjectives
Reduce effective impervious areaReduce effective impervious area Maintain natural conditionsMaintain natural conditions Treat at sourceTreat at source Minimize storm sewersMinimize storm sewers Infiltrate and evaporate Infiltrate and evaporate
stormwaterstormwater
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ApproachApproach Identify Potential BMPsIdentify Potential BMPs
LocationsLocationsDepthsDepths
Perform Soil TestingPerform Soil Testing Evaluate Soil Data & BMPsEvaluate Soil Data & BMPs Develop Conceptual PlanDevelop Conceptual Plan Develop Final PlanDevelop Final Plan
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List of Potential BMPsList of Potential BMPs Rooftop DisconnectionRooftop Disconnection Grass SwalesGrass Swales Riparian BuffersRiparian Buffers Bioinfiltration SystemsBioinfiltration Systems Infiltration TrenchesInfiltration Trenches Infiltration BasinsInfiltration Basins Porous PavementPorous Pavement Constructed WetlandsConstructed Wetlands
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Soil Test Locations
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Infiltration Rates vs. Soil Horizon Type
0
5
10
15
20
25
A Bt Btx Bx Btx/C B/R C C/R
Soil Horizon increasing depth ----->
Infi
ltra
tio
n R
ate
(in
/hr)
< 1 FT 1 to 5 FT > 6 FT
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Final Low Impact Final Low Impact Development PlanDevelopment Plan
Rooftop Disconnection (90%)Rooftop Disconnection (90%) Riparian BuffersRiparian Buffers Bioinfiltration Systems (10)Bioinfiltration Systems (10) Infiltration Basins (5)Infiltration Basins (5) Constructed Wetlands (2)Constructed Wetlands (2)
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Stony Creek Farms Low Impact Development
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2-year, 24-hr Frequency StormRouting through Basin #2
0
5
10
15
20
25
10 12 14 16 18 20
Time (hrs)
Flo
w (
cfs)
Pre-Dev Inflow Hydrograph
Post-Dev Inflow Hydrograph
Post-Dev Inflow Hydrographwith Infiltration BMPs
Post-Dev Routed OutflowHydrograph
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25-year, 24-hr Frequency StormRouting through Basin #2
0
10
20
30
40
50
60
10 12 14 16 18 20
Time (hrs)
Flo
w (
cfs
)
Pre-Dev Inflow Hydrograph
Post-Dev Inflow Hydrograph
Post-Dev Inflow Hydrograph withInfiltration BMPs
Post-Dev Routed OutflowHydrograph
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Case StudyCase Study
Bryn Eyre…the largest planned Bryn Eyre…the largest planned community in Pennsylvaniacommunity in Pennsylvania
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Bryn EyreBryn Eyre Located on 5 square miles in Berks County, PALocated on 5 square miles in Berks County, PA Largest planned community currently being Largest planned community currently being
developed in the northeastdeveloped in the northeast Over 1500 acres of natural area preservation Over 1500 acres of natural area preservation
and open spaceand open space Project has a 25 year development schedule Project has a 25 year development schedule 5 million square feet of retail and commercial 5 million square feet of retail and commercial
spacespace 12,000 residential units12,000 residential units Three new schoolsThree new schools
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Stormwater Management Stormwater Management ApproachApproach
Developed long-term, conceptual Developed long-term, conceptual stormwater management plan stormwater management plan for 5 square mile communityfor 5 square mile community
Developed detailed stormwater Developed detailed stormwater management plan for Phase 1management plan for Phase 1
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Bryn Eyre BMPsBryn Eyre BMPs vegetated buffers and filter stripsvegetated buffers and filter strips bio-swalesbio-swales rain gardensrain gardens underground infiltration trenches and basinsunderground infiltration trenches and basins regionalized rooftop disconnectionregionalized rooftop disconnection dry wellsdry wells constructed wetlandsconstructed wetlands green roofsgreen roofs porous pavementporous pavement riparian buffer enhancementriparian buffer enhancement stream restorationstream restoration and naturalized extended detentionand naturalized extended detention bio-infiltration basinsbio-infiltration basins
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Phase 1Phase 1 110 acres110 acres 459 residential units459 residential units
256 single family256 single family 203 town houses203 town houses
One bog turtleOne bog turtle
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LID Approach – Phase 1LID Approach – Phase 1
Performed detailed site analysisPerformed detailed site analysis Performed over 50 soil infiltration tests Performed over 50 soil infiltration tests Identified sensitive areas…bog turtle Identified sensitive areas…bog turtle
habitathabitat Identified constraints and opportunitiesIdentified constraints and opportunities Used non-structural and structural BMPsUsed non-structural and structural BMPs Integrated site design & stormwater Integrated site design & stormwater
management…worked with plannermanagement…worked with planner
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Phase 1 BMPs
19 Rain Gardens (7 water quality, 12 infiltration)
23 Bioswales ( 6 water quality, 17 infiltration)
17 Infiltration Trenches
4 Naturalized Basins (3 water quality, 1 infiltration)
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Summary – Integrating Site Summary – Integrating Site Design and Stormwater Design and Stormwater
ManagementManagement Requires moreRequires more
Analysis…Modeling…DesignAnalysis…Modeling…Design Need to be creative, think outside of boxNeed to be creative, think outside of box Results are worth itResults are worth it
Better stormwater managementBetter stormwater management Less floodingLess flooding Less streambank erosionLess streambank erosion Improved water qualityImproved water quality Better aestheticsBetter aesthetics Less infrastructure costsLess infrastructure costs