designing and constructing low impact development ... · state water resources control board city...
TRANSCRIPT
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Designing and ConstructingLow Impact Development Stormwater Devices
at Sacramento State
City of SacramentoSacramento State Facilities Management
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Overview• Stormwater Issues• Managing Stormwater: LID• Project
– Background, collaboration, funding, benefits– Design goals and challenges– Construction– Operation and maintenance– Monitoring, education, outreach
• Site Visits
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Stormwater – Water Quality Pollutants
http://www.nassaucountyny.gov
Nutrients
Pesticides Sediment
Heavy Metals
Oil and Grease
Pathogens
http://www.swfwmd.state.fl.ushttp://cfpub.epa.gov
http://www.americanrecycler.com
http://www.floridasprings.org
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Stormwater: Pollutant Sources
4
Fertilizers
Tree/leaf litter
Pesticides
Vehicles & Roads
Industrial activities
Stream erosion
Construction
Pets & wildlife
Humans
http://earthfix.opb.org
http://www.maxwellturf.com
http://www.scientificamerican.com
http://www.wm.edu
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Stormwater: Pollutant Impacts
5
Algae blooms Fish kills Habitat destruction Reservoir storage loss Visually Unappealing Odors Toxicity Beach closures
Study links salmon deaths to stormwater runoff from highways
Stormwater is one of the leading, remaining causes of water quality problems (EPA) http://action.surfrider.org
http://www.oregonlive.com
http://mandellplace.orghttp://www.cantonpl.org
www.examiner.com
http://www.charlottesville.org
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StormwaterA Common Theme: Urbanization
6
http://www.peachcounty.net/stormwaterdepartment.cfm
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Stormwater: Urbanization Impacts
7
Increased Flow and Volume Results in• Increased Flooding
• Increased Stream Bed and Bank erosion
• Enlarged channels
• Habitat Loss and Damage
• Increased Pollutant Transport (Increase Water Quality Impacts) Increased Aquatic Toxicity
Increased Consumer Toxicity
Increased Health Outbreaks
Increased Beach Closures
Degradation of Aesthetics
http://www.sccwrp.org/researchareas/Stormwater/Hydromodification/EffectOfIncreasesInPeakFlowsAndImperviousness.aspx
http://www.crwr.utexas.edu/gis/gishydro03/Classroom/trmproj/Lancaster/AustinErosion.htm
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Managing Stormwater Today:Low Impact Development (LID)
1. Mimic Natural Hydrology (Infiltrate)
2. Protect Receiving Waters
3. Reduce Flooding4. Groundwater Recharge5. Opportunities for Reuse US
EPA
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LOW IMPACT DEVELOPMENT (LID)Types of Devices
9
http://www.csc.temple.edu/t-vssi/BMPSurvey/delaware_countycc.htm
Bioretention Planters
Rain Gardens
Bioswales
Porous Pavement
Biostrips
Road Narrowing (reduce impervious area)
Cisterns or Rain Barrels
Tree Box Filters
Constructed Wetlands
Green Roofs
Infiltration Trenches
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Rain Garden Profile and Function
10
Surface depth 6”
Amended Soil depth 18”
Native Soil
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Rain Gardens
Harford County, MDUS EPA
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Bioswale - Profile
Native Soil
6” heightAmended Soil: 6” – 18”
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Bioswales
Lake County, ILCaltrans
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Bioretention Profile and Function
14
Surface depth 6”
Amended Soil depth 18”
Underdrain storage depth 12”
Elevated Underdrain Discharge
Native soil
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Bioretention – Parking Lots
Scott Taylor, PERBF Consulting
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Bioretention – Streets
Scott Taylor, PERBF Consulting
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Porous Pavement - Profile
Native Soil
Porous Pavement
Gravel Filter Course
4”
12”
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Porous Pavement
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LID Implementation at Sacramento State
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Project Background: Campus Stormwater
Drain Inlet ‐ Campus Storm Drain Discharges into American River
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Project Background: American River
Outfall – Guy West Bridge Upstream Sample
Discharge Sample
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Project Background1. Proposition 84 – Stormwater
Grant Program2. State Water Resources
Control Board3. Objectives:
a) Prevent stormwater contamination of rivers, lakes, and streams.
b) Implement requirements of stormwater permits
c) Implement Low Impact Development (LID)
d) Monitoring and Education OutreachCity of Kirkland, WA
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Project Collaboration
State Water Resources Control Board
City of Sacramento
Office of Water Programs @ Sacramento State/UEI
Sacramento State Facilities Management
Design and Construction Contractors
Project ManagementDesign and Construction OversightStormwater MonitoringPublic Education and Outreach
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Project FundingProject Total - $3.3M
A. Prop 84 - $2.6MB. Local Match - $0.7M
i. Sacramento State FM - $500Kii. City of Sacramento - $112Kiii. Office of Water Programs – $31Kiv. Dry Creek Conservancy - $30Kv. Local LID Expertise - $25Kvi. County of Sacramento - $1K
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Project Benefits1. Meet Stormwater
Permit Requirements2. Faculty/Student
Involvement3. High Visibility4. Protects the American
River5. Replenish Irrigation
Wells6. Demonstration and
Training Facility for Northern CA
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Campus Layout
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Design GoalsEnhance Infiltration
A. Silty sands over gravelsB. No devices linedC. 14 acre-feet per year infiltrated or treatedD. 13.2 acre-feet per year - infiltration aloneE. Total Tributary Area ~ 13 acres
Hearty VegetationA. Drought- and Inundation-TolerantB. Variety of Types and Combinations
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Design Goals – Large Tributary Areas
Parking Lot 7 (South): Bioretention Planters and Bioswale
1.64 Acres1.82 Acres
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Design Challenges1. Fitting into the existing drainage system
a. Horizontalb. Vertical
2. Negotiating the removal of parking stalls3. Fitting into existing topography4. Existing infrastructure5. Interactions with buildings6. Subsurface soil?7. Timing8. Compatibility with Campus Master Plan
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Design Challenges• Fitting into the existing drainage system
– Horizontal
Drain in traveled way Drain conveniently located
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Design Challenges• Fitting into the existing drainage system
– Vertical
Existing pipe invert to be maintained(can limit depth of bioretention media)
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Design Challenges• Negotiating the removal of parking stalls
8 97 10
1 2 53 4
6 11
186 stalls in watershed
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Design Challenge• Fitting into existing topography
– Steep slopes don’t accommodate large bioretention cells
Bioretention media
6”
1’ bench
2:1
Volume reduced by bench
3’ wall with curb
6”
Existing pavement(slope exaggerated)
Railing
3’ wall 7’ wall with curb
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Design Challenges• Conflicts with other infrastructure
– Sanitary sewer, gas, electric, light standards, trees
Gas (high pressure)
Water
Electrical
CommunicationsStorm
Lightstandard
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Design Challenges• Interactions with buildings
– Avoid saturating soils around foundations– Tapping into building drainage systems
• May require architect or mechanical engineer• Some inaccessible
Concrete bottomSeparation from wall
This one is OK but what if the pipe is inside the building?
Calaveras Hall
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Design Challenges
• Subsurface soil– Will it infiltrate?– How has it been affected by previous
construction?• Timing
– Summer Construction Window
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Design Challenges• Compatibility with campus master plan
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Construction Status• Lot 7, Lot 10, College Town Drive
– Construction complete– Contractor returning mid-October to replace plants
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Construction Status• Jed Smith Drive
– Construction complete– Planting and landscaping currently underway
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Construction Status• Library Green, Campus Grove, & Calaveras Hall
– Rain garden infrastructure complete– Planting and landscaping currently underway– Public access installations resuming soon
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Construction Challenges• Unanticipated utilities and tree roots
– Reduced footprints– Changed geometry– Broken irrigation lines flooded excavations– Parking pass dispenser shut down
• Specified plants not available• Keep heavy equipment off excavations• Unknown vehicular access points• Extremely hot weather• Improper planting techniques
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Monitoring• Performance Monitoring
– Flows (pressure heads)– Water Quality
• TSS, TDS, turbidity• Chlorpyrifos & Diazinon• Copper, Lead, & Zinc
• Evaluation & Reporting– Up to 90% reductions
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Rainfall Intensity (mm/hr)Flow Rate (L/s)Sample Taken
Event SummarySite: Sac ORVTS (3-362)Event: 2010/11-3/18/2011
Catchment Area (ha): 0.041Assumed Fraction Runoff/Rain Volume: 0.07
Rain DataStart Date/Time: 03/18/11 11:49
Stop Date/Time: 03/20/11 18:32
Event Rain (mm): 37.08Max Intensity (mm/hr): 12.19
Runoff DataStart Date/Time: 03/18/11 11:50
Stop Date/Time: 03/21/11 07:01
Total Flow Volume (L): 1606Peak Flow (L/s): 0.18
Obs. Fraction Runoff/Rain Volume: 0.106
Sample DataStart Date/Time: 03/18/11 12:01
Stop Date/Time: 03/20/11 18:53
Estimated Percent Capture: 93%Successful Aliquots: 103
Notes: Two day event. RO/Rain <<1_RO infiltration suspected. RO/RF ratio is within the range observed during the 2009-10 monitoring season (0.016 - 0.129). Rain covers are currently in place over the collection system. Flow at end of event most likely caused by standing water remaining in the flume.
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Education and Outreach
1. Signage, Website, Tours (Mobile App)
2. Brochures3. Conferences and
Papers4. LID Conference5. Campus
Presentations6. Public Affairs
Kitsap Conservation District Green Side Up
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Operation and Maintenance
1. Weed, Litter, and Debris Removal (As needed)
2. Infiltration Inspections (Runoff Infiltrating?) (Twice a year during storms)
3. Low or no Infiltration? Remove and Replace Topsoil (~ 5 to 10 years)
4. Use integrated pest management (IPM) techniques to minimize use of fertilizers, pesticides and herbicides. (As needed)
5. Inspect (~ 2 times per year –including once at end of wet season) for erosion and sediment buildup. Correct problems as needed.
Kevin PerryUrban Rain Design
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Project Timeline
Spring 2015: Complete DesignSummer and Fall 2015: Construction2015/2016: Post-Construction MonitoringJanuary 2017: Final Report2016 – 2036: O&M
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Funding for this project has been provided in full or in part through an agreement with the State Water Resources Control Board. The contents of this document do not necessarily reflect the views and policies of the State Water Resources Control Board, nor does mention of trade names or commercial products constitute endorsement or recommendation for us.
Project Funded by SWRCB
www.owp.csus.edu