Storage and Recovery of Rooftop Rainwater Runoff Using Drinking Water Wells
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1 Storage and Recovery of Rooftop Rainwater Runoff Using Drinking Water Wells David Embleton, WT4, WD4, CCS, WTI, RCSAP Journal of Contemporary Water Research & Education, Issue 148. August 2012
2 Effective Water Management Tool
3 Main Topics 1. Pilot Studies 2. Low-Impact Development Practice 3. Supplementary Drinking Water Source 4. Improves Ecosystem Health
4 Pilot Studies
5 Pilot Studies Aquifer Storage and Recovery (ASR) Winter Store treated rooftop rainwater in well Summer Recover blended rainwater /groundwater from well Winter Store treated rooftop rainwater in well
6 Pilot Studies Volcanic Rock Aquifers: Hydraulic conductivity is less than 1 ft/day
7 Pilot Studies Class V Underground Injection Control UIC System Dry Well - Rooftop Runoff No pretreatment Not deeper than 100 ft Cannot discharge into groundwater ASR Well - Rooftop Runoff Pretreatment required (drinking water) Beyond 100 ft is allowed Intended to discharge into groundwater
8 Pilot Studies Exempt Wells Pilot Study #1 May 2007 Pilot Study #2 August 2009 Pilot Study # 3 October 2009
9 Pilot Studies Need for Water 1. Haul Water 2. Rehab Well 3. Drill New Well 4. Construct Pond 5. Gray Water 6. Rainwater Harvesting Only 7. New Water Management Tool
10 Pilot Studies Strategies to avoid contaminated water 1. Underground Injection Control (UIC) System Permit 2. Use rain harvesting Best Management Practices (BMPs) 3. Wellhead and ASR BMPs 4. Rainwater must be treated to drinking water standards 5. Testing for heavy metals and hydrocarbons.
11 Total Dissolved Solids (TDS) (mg/l) Water Quality Monitoring Pilot Studies 600 Total Dissolved Solids (TDS) Before and After Recharge TDS Before Recharge TDS After Recharge Pilot Study 1 Pilot Study 2 Pilot Study 3
12 Pilot Studies Blended water has amazing water quality Lower mineral content Improved taste and odor Water quantity was increased Well started with almost no water Inject: 20, 000 gallons Recover: 20,000 gallons
13 Low Impact Development Practice Impervious surfaces Barriers to groundwater recharge Increase storm water system flows Increase peak flows in rivers Reduces ability of remaining soils to filter pollutants New water management tool 0% Impervious rooftop surfaces 17% Natural filtration 90-95% Recharge well directly 6X the amount of water is recharge using well
14 Low Impact Development Practice New Water Management Tool Open barriers to allow groundwater recharge Decreases storm water system flows Decreases peak flows in rivers Reduces pollutants in groundwater
15 Low Impact Development Practice City of Salem, Oregon Rooftop rainwater collection 2.3 billion gallons of rainwater per year
16 Supplementary Drinking Water Source Increasing Demands for City Water Systems 1. Low Groundwater Levels 2. Water Rights Availability 3. Groundwater Pollution 4. Increased Regulations 5. Infrastructure Needs 6. Power Consumption 7. Back-up Water System 8. Emergency Response Preparedness 9. Outdoor Irrigation
17 Supplementary Drinking Water Source Outdoor Irrigation On average 30% of drinking water used for outdoor water use. City of Salem About 25% of City s water supply could be supplemented with this new water management tool. Great use for rainwater
18 Supplementary Drinking Water Source Safety of Water Proper construction of well (OWRD) Underground Injection Control Permit (ODEQ) Plumbing permits (City) Rainwater harvesting, wellhead, and city/public water system BMPs City water systems or private contractors could provide maintenance
19 Supplementary Drinking Water Source Recycled Water Built in Piping System
20 Improves Ecosystem Health Increasing Demands on Ecosystems Climate Change Reduction of wetlands Low summer flows in rivers High peak flows in winter (flooding) Low groundwater levels High river water temperatures Polluted groundwater and river water Increase in energy demands Degradation of air quality
21 Improves Ecosystem Health Ways to lighten load on ecosystem Solar water pumps Geothermal Heat Pumps Reduction in demand for electricity Increase groundwater and river water quality Water conservation Human water connection Decrease in river temps Increase in air quality Decreased flooding Wetland alternative
22 Improves Ecosystem Health Wetland Cycle Wetland Alternative 900 acres of surface area for soaking in clean rainwater within the City of Salem
23 Review Successfully done for 5 years in Oregon Potential application in urban areas Reliable supplementary water source Increase health of our ecosystem Possible incentives for consumers Effective water management tool
24 Thank you! David Embleton, GeoRain Journal of Contemporary Water Research & Education, Issue 148. August 2012
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