Kennedy/Jenks Consultants Using Model Ordinances and LID Design Guidance Manuals to Overcome...
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![Page 1: Kennedy/Jenks Consultants Using Model Ordinances and LID Design Guidance Manuals to Overcome Implementation Obstacles Chris Conway, CPSWQ Lynn Orphan,](https://reader037.fdocuments.us/reader037/viewer/2022110101/56649e6b5503460f94b6a262/html5/thumbnails/1.jpg)
Using Model Ordinances and LID Design Guidance Manuals to Overcome Implementation Obstacles
Chris Conway, CPSWQLynn Orphan, P.E.
Kennedy/Jenks ConsutlantsTerri Svetich, P.E.
Truckee Meadows Storm Water Program Coordinator
Central Coast RWQCB WorkshopSan Luis Obispo - November 18, 2005
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Outline
I. LID Principles & Practices
II. Recommended Policies & Procedures
III. Tools to Promote LID
IV. LID Design Considerations
V. Monitoring Program Success
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What is LID?
Design features and practices distributed throughout urban development that:
Disconnect Impervious Surfaces
Mimic Natural Hydrologic Processes
Reduce Runoff Rates & Volumes
Reduce Pollutant Loads
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Pioneered in Maryland 1985 to address economic and environmental issues
Applied to western communities such as:
Denver, Boise, Phoenix, Los Angeles, San Diego, San Francisco, Portland, and Seattle
Evolution of Low Impact
Development
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Boise, ID
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Portland, OR
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Reno, NV
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Carson City, NV
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Porous Pavement at Lake Tahoe
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Cluster Development & Open Space Preservation
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How Do We Implement LID?
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The Truckee River Watershed
Lake Tahoe to Pyramid Lake
Pollutants of Concern
Fine Sediment & Lake Clarity
TSS, N, P, TDS, Temp, & Turbidity
The Truckee Meadows
Reno, Sparks, Washoe Co.
Rapid Urban Development
TMDLs: N, P, TDS
Non Point Source Control
LID & Public Outreach
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Reno Whitewater Park
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Professional Advisory Group (PAG)
Formed in 2004 to develop recommended policies & procedures for implementing treatment controls and LID
PAG Members (Stakeholders):
Developers and Engineers
Builders, Contractors & Landscaping Associations
Community Development, Public Works & Maintenance
Regional Water Planning Commissioners
Environmental Interests
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Recommended Policies & Procedures
1. Plan Review & Permitting
2. Construction Inspection
3. Tracking & Maintenance Notification
4. Long-term Operation & Maintenance
5. Inspection & Enforcement
6. Training & Public Outreach
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Plan Review and Permitting
All projects that will disturb one acre or more:
Require storm water quality and soils information in drainage, hydrology and geotechnical reports
Display treatment controls and LID practices on proposed private and public development site plans
Enforce existing policies to preserve natural drainage ways and groundwater recharge zones
Require standard design criteria
If infiltration proposed, testing required
Apply existing building permit and/or environmental control permit process to storm water BMPs
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Construction Inspection Inspections by environmental control, other agency
staff, or the engineer of record during construction
Provide GPS coordinates of completed facilities to the appropriate jurisdiction
Tracking and Maintenance Notification
Cities and County:
Track the type, location and ownership of treatment controls and LID practices using a GIS
Notify BMP owners maintenance required
Link BMP GIS to County Assessors database
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Operation and Maintenance
Require O&M plans that include maps of facilities, define O&M requirements, and responsible parties
O&M Responsibility & Funding
Property owners of industrial, commercial and civic (i.e. churches & schools) land uses
City or County for public facilities and residential developments (Not HOAs!)
Maintenance easements and funding mechanisms (i.e. Drainage Districts, Storm Water Utilities, etc.)
O&M by agency staff or maintenance contractor
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Inspection and Enforcement
Cities and County:
Apply existing legal mechanisms and agency inspection and enforcement procedures
Apply industrial storm water discharge permit classifications to determine inspection frequencies
Adopt City of Reno construction inspection procedure ($100 re-inspection fee)
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Training
Develop annual training sessions:
1. Design training for engineers, planners, landscape architects and agency staff
2. O&M training for property BMP owners, operators and agency inspection and maintenance staff
Low cost training developed through NWEA and UNCE
Certificate of completion
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Nonpoint Source Education for Municipal Officials (NEMO)
LID Seminars & Workshops
Water Watch by Storm Center
Public Education & Outreach
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Additional Tools to Promote LID
1. Design examples and standard details
2. Streamline plan review & permitting
3. Egineering tools & financial incentives
4. LID demonstration projects
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NRCS Soils Maps
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1. Water Quality Volume (WQV) - Landscape Detention Basin Storage
a) Percent of Watershed Impervious Area = I I = 85 %
b) Drainage Area = A (ft2) A = 14,000 ft2
c) Watershed Runoff Coefficient = Rv (unitless) Rv = 0.82
d) 90th Percentile Precipitation Depth = P (inches) P = 0.60 inches
e) Water Quality Volume = WQV (ft3) WQV = 571 ft3
2. Landscape Detention Basin Dimensions
a) Ponding Depth = DWQV (6-inch minimum, 12-inch maximum) DW QV = 12.0 inches
b) Surface Area (SA) of basin = WQV/DWQV SA = 571 ft2
Standard Design Forms
Blue cells: Designer enters site specific data
Yellow cells: Write protected formulas produce design data
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LID vs. Conventional Storm Drainage for a 2 acre Parking Lot
1. Conventional Storm Drain System (catch basins and storm drain pipes)
2. Landscape Detention with Underdrains (poorly drain soils, e.g. clayey soils)
3. Landscape Detention without Underdrains (well drained soils, e.g. sandy soils)
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200’
420’
10
’
60’
20
’Conventional Storm Drain SystemConcrete pipe & mounded landscaping
3 catch basins, 1 manhole, 200’ of 12” RCP, 75’ of 18” RCP
Catch BasinManhole
18
” R
CP
12” RCP
Increased flow rate, volume and pollutant loadingIncreased flow rate, volume and pollutant loading
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Landscape Detention (Bioretention)
Physical, Chemical & Biological Physical, Chemical & Biological Processes Reduce PollutantsProcesses Reduce Pollutants
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Source: Center for Watershed Protection
Landscape Detention (Bioretention)
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200’
420’
10
’
60’
20
’Landscape Detention with 5 Underdrains1 catch basin, 1 manhole, 75’ of 12” RCP, 670’ of 4” PVC
5 bioretention basins, all with underdrain systems
(167 CY engineered soil, 75 CY Type 2 aggregate)
Bioretention & Underdrain
4” PVC
12
” R
CP
4” P
VC
SwaleSwale
Inflow & Overflow via curb cuts
Overflow to SD system
Inflow via curb cuts
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200’
420’
10
’
60’
20
’Landscape Detention with 3 Underdrains1 catch basin, 1 manhole, 75’ of 12” RCP, 410’ of 4” RCP
5 bioretention basins, 3 with underdrain systems
(167 CY engineered soil, 75 CY Type 2 aggregate)
4” PVC
12
” R
CP
Bioretention & Underdrain
Inflow & Overflow via curb cuts
SwaleSwale
Overflow to SD system
Inflow via curb cuts
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200’
420’
10
’
60’
20
’Landscape Detention without Underdrains
5 infiltration tests, 1 catch basin, 25’ of 12” RCP
5 bioretention basins with no underdrain system
(167 CY eng soil, 74 CY Type 2 aggregate)
SwaleSwale
Bioretention & Infiltration
Inflow & Overflow via curb cuts
Overflow to SD system
Inflow via curb cuts
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LID Cost Comparison
Landscape detention scenarios reduce pollutant loads by 80 – 90% and retain approximately 4,000 ft3
of storm water runoff onsite = 100% of 5-yr storm
1. Conventional Storm Drain System approx. $31,000
2. Landscape Detention with Underdrain approx. $29,000 to $36,100
3. Landscape Detention without Underdrain approx. $15,000
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LID Design ConsiderationsPrevent groundwater contamination
Proper siting of infiltration systems essential
Infiltration rates 0.5 to 2.4 in/hr (120 to 25 min/in)
150 ft or more from drinking water wells
Pretreatment recommended
Keep storm water out of crawl spaces Proper grading
Good ventilation
Foundation Drains
Prevent mosquito breeding No standing water 7 days or more (May - October)
Proper design and maintenance required
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Monitoring Monitoring Program SuccessProgram Success
Codes & Ordinances Adopted and EnforcedCodes & Ordinances Adopted and Enforced Standard Design Forms UtilizedStandard Design Forms Utilized LID Demonstration Projects ImplementedLID Demonstration Projects Implemented Professional Training EstablishedProfessional Training Established Public Awareness IncreasedPublic Awareness Increased
www.TMstormwater.com