Reuse of Stormwater for Irrigation of Municipal Ballfields in Centerville, Minnesota
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1 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
2 Centerville Location Map
3 Rice Creek Watershed District Map
4 Key Resource to Protect: Centerville Lake
5 Downtown Redevelopment
6 RCWD Rules Rate Control No increase from existing for 2-year and 100-year events Water Quality and Volume Control Infiltrate inch event, depending on site conditions Alternative sequencing if infiltration is infeasible
7 Options Stormwater ponding
8 Options Stormwater ponding Infiltration features
9 Options Stormwater ponding Infiltration features In-line treatment devices Source: Metro Vancouver Best Management Practices Guide for Stormwater
10 Options Stormwater ponding Infiltration features In-line treatment devices Underground storage
11 Options Stormwater ponding Infiltration features In-line treatment devices Underground storage Stormwater reuse
12 Selected Option: Stormwater Reuse for Irrigation of Laurie LaMotte Park Ballfields
13 Selected Option: Stormwater Reuse for Irrigation of Laurie LaMotte Park Ballfields
14 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
15 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?
16 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
17 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
18 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
19 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
20 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
21 System Design Components of system Pond Intake Supply line Pump and wet well Controls Irrigation system
22 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
23 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
24 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
25 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
26 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
27 System Design: Gun-Style Irrigation System Let s see it work! 200 spray radius psi 50% less capital cost vs. traditional Just 7 irrigation heads cover 11 acres of ballfields
28 Project Costs Pond, intake, supply line $125,000 Pump, wet well, controls $ 52,000 1 Irrigation system $ 52,000 Design, administration $ 40,000 Total $269, City reused existing pump and control panel 2 Funding sources: City of Centerville, Clean Water Legacy Fund, RCWD
29 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
30 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
31 Questions? Dallas Larson, City of Centerville, Dan Edgerton, Stantec, Mark Statz, Stantec,
32 Taft Lake Watershed Regional Stormwater Treatment Partnership A cooperative venture between the Minnehaha Creek Watershed District and the City of Richfield 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
33 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 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
34 Area Treated by Water Quality Improvement Project Legion Lake Minneapolis Taft Lake Richfield: 1,234 Acres Lake Nokomis Highway 77 MAC: 318 Acres Airport 1,600 acres treated Fully developed $2.7 million Bloomington 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
35 What is a Regional Approach? Centralized treatment (not site by site) using the full spectrum of treatment options: Active: - Irrigation - Flocculation* - Infiltration pipes Passive - Buffers - Sumps - Ponds * 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. 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
36 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 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
37 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 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
38 Richfield 1950s: Wells and Septic Systems 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
39 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 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
40 High or very high Vulnerability Drinking Water Supply Management Areas Richfield 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
41 Taft Lake Richfield 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
42 Project Elements Water reuse irrigation system Water reuse infiltration system Habitat enhancement shoreline buffers Grit chambers Flocculation treatment 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
43 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
44 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 acre-ft Total phosphorus loadings by lb 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
45 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 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
46 Native Wetland Buffer Plantings Reduce phosphorus loadings by 2-8 lb Enhance habitat for wide range of benefits 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
47 Construct Grit Chambers Will remove sediment prior to discharge into Legion Lake Reduce coarse phosphorus load by lb 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
48 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 lb/year Treats water from 1,600 acres Less than one acre of land used 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
49 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
50 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
51 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
52 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
53 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
54 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 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
55 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 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
56 QUESTIONS & ANSWERS 701 Xenia Avenue South, Suite 300 Minneapolis, MN Tel: (763) Fax: (763) wsbeng.com
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