reuse of stormwater for irrigation of municipal ballfields ...701 xenia avenue south, suite 300 ....
TRANSCRIPT
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Reuse of Stormwater for Irrigation of Municipal Ballfields in Centerville, Minnesota Dallas Larson – City Administrator – Centerville
Dan Edgerton – Water Resources Engineer – Stantec
Mark Statz – City Engineer - Stantec
Minnesota Water Resources Conference 10/17/2012
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Centerville Location Map
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Rice Creek Watershed District Map
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Key Resource to Protect: Centerville Lake
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Downtown Redevelopment
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RCWD Rules
Rate Control • No increase from existing for 2-year and 100-year
events Water Quality and Volume Control • Infiltrate 0.8 - 2.8 inch event, depending on site
conditions • Alternative sequencing if infiltration is infeasible
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Options
• Stormwater ponding
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Options
• Stormwater ponding • Infiltration features
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Options
• Stormwater ponding • Infiltration features • In-line treatment devices
Source: Metro Vancouver Best Management Practices Guide for Stormwater
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Options
• Stormwater ponding • Infiltration features • In-line treatment devices • Underground storage
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Options
• Stormwater ponding • Infiltration features • In-line treatment devices • Underground storage • Stormwater reuse
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Selected Option: Stormwater Reuse for
Irrigation of Laurie LaMotte Park Ballfields
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Selected Option: Stormwater Reuse for
Irrigation of Laurie LaMotte Park Ballfields
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Advantages of Stormwater Reuse Option
• Saves space in downtown redevelopment area vs. stormwater ponds or infiltration features
• Provides needed irrigation system to ballfields with “free” water
• Reduces stress on aquifer from irrigation demands • Keeps stormwater on the land – reduces runoff peaks
and volumes • Protects quality of Centerville Lake
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Questions to be Answered
• Is the stormwater safe for use in a city park? • Will the stormwater kill turf grass due to high salinity? • Will the sprinkler system clog from sediment in the
stormwater? • What if the pond water for irrigation runs out? • What permit requirements need to be met?
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Is the stormwater safe for use in a city
park?
• Water quality tests on pond water and sediment – fecal coliforms, heavy metals, PAHs, volatile organics, pH, chloride, Legionella – Results below MnDNR standards for swimmable waters
• Soil testing in ballfields to establish baselines – heavy metals, PAHs, volatile organics, pH, chloride – Results below Health Department guidelines
• Will continue to test periodically
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Will the stormwater kill turf grass due to
high salinity?
• Chloride levels in pond water did not indicate problem • City will incorporate best management practices to
reduce risk – Sprinkling protocols – Fertilizer formulas
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Will the sprinkler system clog from
sediment in the stormwater?
• Learned from practices in golf course industry • Pond and intake designed to minimize sediment in
irrigation system • Sprinkler heads selected based on performance under
these types of conditions
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What if the pond water for irrigation runs
out?
• Pond designed with capacity for three weeks of operation with no rain
• City’s potable water system can be used to refill pond – without direct interconnection between potable water system and irrigation system
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What permit requirements need to be met?
• MnDNR Water Appropriations permit was needed • Future permit requirements? TBD • At the same time, the project helped meet (and
exceed) RCWD requirements
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System Design
• Components of system – Pond – Intake – Supply line – Pump and wet well – Controls – Irrigation system
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System Design: Pond • No immediate modifications
to pond • Future improvements to
pond to increase storage capacity
• Floating dock section for use in inlet screen maintenance
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System Design: Intake • Important to keep inlet clean • Designed for inlet velocities of less than 0.5 fps • Well screen utilized to keep aquatic life out (frogs, etc.) • Fabric/Rip Rap/Sump to keep sediment and vegetation out
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System Design: Supply Line • HDD used to avoid prairie plantings and deep cuts in
County Regional park
• HDD used to avoid prairie plantings and deep cuts in regional park
• Flat grade used to avoid sediment build-up at low point in line
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System Design: Pump and Wet Well • City reused existing well control panel • System utilizes city-owned well pump that was no longer
being used • Wet well was installed like a standard water supply well
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System Design: Controls
• Keep it simple • Pump is triggered by drop in pressure • Sprinklers are opened by standard irrigation control
system creating pressure drop • System has ability to add moisture probe and wind
gauge
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System Design: Gun-Style Irrigation System • Let’s see it work! • 200’ spray radius • 400 gpm @ 100 psi
• Just 7 irrigation heads cover 11 acres of ballfields
• 50% less capital cost vs. traditional
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Project Costs
Pond, intake, supply line $125,000 Pump, wet well, controls $ 52,0001
Irrigation system $ 52,000 Design, administration $ 40,000 Total $269,0002
1 City reused existing pump and control panel 2 Funding sources: City of Centerville, Clean Water Legacy Fund, RCWD
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System Maintenance
• A lot is yet to be determined • Examine and clean (if necessary) inlet screen • Treat well pump like any other well pump • Treat irrigation system like any other irrigation system
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Results and Conclusions
• System is fully operational and was successful throughout the summer
• At the very end of this year’s drought, the city did fill the pond with their water supply. However, the pond lasted longer than the estimated 3 weeks without rain.
• Volume used is to be monitored over a 3-year period for use in determining actual volume credits through RCWD
• Don’t be afraid to try something new
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Questions?
Dallas Larson, City of Centerville, [email protected]
Dan Edgerton, Stantec, [email protected]
Mark Statz, Stantec, [email protected]
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
Taft Lake Watershed Regional Stormwater Treatment Partnership
A cooperative venture between the Minnehaha Creek Watershed District and the City of Richfield
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
Partnership Financial Features
Minnehaha Creek WSD commitment
• $2.7 million funds for capital improvement
City of Richfield commitment
• $3.0 million of 20-year O&M
• City willing to bond for project to spread MCWD costs over time
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
Area Treated by Water Quality Improvement Project
Richfield: 1,234 Acres
MAC: 318 Acres
Hig
hw
ay 7
7
Minneapolis
Bloomington
Lake Nokomis
Taft Lake 1,600 acres treated Fully developed $2.7 million
Legion Lake
Airport
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
What is a Regional Approach?
Centralized treatment (not site by site) using the full spectrum of treatment options:
Active: - Irrigation - Flocculation* - Infiltration pipes
* Flocculation, in the field of chemistry, is a process wherein colloids come out of suspension in the form of floc or flakes by the addition of a clarifying agent.
Passive - Buffers - Sumps - Ponds
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
Regional vs. Site by Site Approach
Regional (centralized)
•Public (long-term)
•Immediate results
•Entire area treated
•Public maintenance
Site by site (piecemeal)
•Private (mostly)
•Delayed results
•Fragmented treatment
•Private (no?) maintenance
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
Regional vs. Site by Site Approach (continued)
Regional (centralized)
•Measurable results
•Wellheads protected
•Economy of scale
•Compatible land use
•Long-term planning
Site by site (piecemeal)
•Fragmented measurement
•Little control of wellheads
•Small-scale inefficiency
•Maybe incompatible land use
•Defies planning
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
Richfield – 1950s: Wells and Septic Systems
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
Richfield Urbanization: Centralized Infrastructure
• Met the post-WWII housing need
• Not viable long-term water and septic solution
• 1950s – built centralized sewer system
• 1960s – built centralized water system
• 1970s – built all residential streets
• 1980s – retrofitted 100-year flood protection
• 2013 – build centralized surface water treatment
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
High or very high Vulnerability Drinking Water Supply Management Areas
Richfield
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
Taft Lake
Richfield
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
Project Elements
• Water reuse irrigation system
• Water reuse infiltration system
• Habitat enhancement – shoreline buffers
• Grit chambers
• Flocculation treatment
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
Stormwater Reuse Irrigation
• Install irrigation systems in Veterans Park/Taft Lake Park
• Operate systems for up to 30 weeks
• Systems can annually reduce:
– Runoff volumes by 14-40 acre-ft
– Total phosphorus loadings by 17-50 lb
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
Stormwater Reuse Infiltration
• Install infiltration/drain tile systems in Veterans Park/ Taft Lake Park
• Operate system for up to 180 days
• Systems can annually reduce:
– Runoff volumes up to 240 acre-ft
– Total phosphorus loadings up to 216 lb
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
Native Wetland Buffer Plantings
• Reduce phosphorus loadings by 2-8 lb
• Enhance habitat for wide range of benefits
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
Construct Grit Chambers
• Will remove sediment prior to discharge into Legion Lake
• Reduce coarse phosphorus load by 10-30 lb
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
Flocculation Treatment System
• Construct/install intake and outfall pipes, pumps, storage tanks, metering systems, controls
• Treats water to an extremely high quality standard
• Removes soluble phosphorus
• Reduces total phosphorus loading by 40-160 lb/year
• Treats water from 1,600 acres
• Less than one acre of land used
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
Potential Annual Load Reduction for Proposed Improvements
Improvement Annual Reduction
(pounds)
Water Reuse Irrigation System 17 to 50
Water Reuse Infiltration System 108 to 216
Habitat Enhancement 2 to 8
Construct Grit Chambers -
Reduction of Impervious Surface 1
Flocculation Treatment 40 to 160
TOTAL 167 to 413
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
Taft/Legion Regional Partnership: Creativity & Leadership
• Technical
– Active and passive treatment methods
– Treating the lake itself, but not in-lake treatment
• Bureaucratic
– Regional concept
– Multi-agency: MAC, MnDOT, Hennepin County, MPCA, DNR
• Financial
– City sells bond, MCWD makes payments
– Spread costs over the life of the project
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701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 Tel: (763) 541-4800 · Fax: (763) 541-1700 wsbeng.com
QUESTIONS & ANSWERS