Eugene Water & Electric Board. The Water Conservation/Water Quality Paradox
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1 Eugene Water & Electric Board The Water Conservation/Water Quality Paradox
2 Eugene Water & Electric Board/Carollo Engineers The Water Conservation/Water Quality Paradox Jill Hoyenga, Water Resource & System Planner Rachel Lanigan, Lead Engineer Carollo Engineers PNWS-AWWA Eugene 2014 Conference
3 Introductions About Eugene Water & Electric Board About Carollo Engineers
4 For the next 60 minutes Water utility purpose and operational constraints Water conservation impacts on operations Rethinking the relationship between water conservation & water operations We ve got questions! Who s got answers?
5 Modern Pressurized Water Distribution Systems Source: EPA.gov
6 Generic Water Distribution History Fire!!!
7 Generic Water Distribution History Fire!!! Water Distribution Systems for Fire
8 Generic Water Distribution History Fire!!! Water Distribution Systems for Fire Domestic use of water system
9 Generic Water Distribution History Fire!!! Water Distribution Systems for Fire Domestic use of water system Waterborne Illness
10 Generic Water Distribution History Fire!!! Water Distribution Systems for Fire Domestic use of water system Water Quality Treatment Regulations Waterborne Illness
11 Water quality regulations established for source water Safe Drinking Water Act Ever increasing water quality standards High levels of treatment
12 Generic Water Distribution History Fire!!! Water Distribution Systems for Fire Domestic use of water system Merging/Expanding Distribution Systems Water Quality Treatment Regulations Waterborne Illness
13 Generic Water Distribution History Fire!!! Water Distribution Systems for Fire Domestic use of water system Merging/Expanding Distribution Systems Water Quality Treatment Regulations Waterborne Illness Water Quality Regulations for Distribution System
14 Reservoir/Tank Water Quality requires maintenance Operate reservoirs to manage turnover Redesign reservoirs to enhance mixing Spill water to waste
15 Water System Bands Daily operations 20 to 30% Fire flow 65 to 75% Emergency storage Dead zone Never deplete the tank, no dregs in the distribution system Never go to negative pressure 5%
16 Water quality regulations established for the distribution system Maintain chlorine residual throughout the distribution system Re chlorination stations Flushing to purge stale water Automatic flushers Unidirectional flushing
17 Modern U.S. Water Distribution The need for fire suppression was as important as drinking water in developing modern municipal water systems Reducing waterborne illness has led to ever increasing water quality requirements High volume requires high demand for maintaining water quality
18 High Volume for Fire Flow vs Low Demand for Conservation High Volume ISO Fire Flow Standards Fire flow for 2500 sqft 2 story home is 1,250 gallons per minute (gpm) Low Demand EPAct 1992 low flow fixture water conservation requirements Max domestic flow for 2500 sqft 2 story home With irrigation gpm Without irrigation less than 10 gpm
19 High water use helps maintain distribution water quality 20,000 SFR Monthly Indoor vs. Outdoor Water Use 18,000 Water Use (gal/mo/account) 16,000 14,000 12,000 10,000 8,000 6,000 4,000 Outdoor Avg Indoor 2,000 0
20 High Volume for Fire Flow vs No Demand for Conservation High Volume ISO Fire Flow Standards Fire flow for 2500 sqft 2 story home is 1,250 gallons per minute (gpm) No Demand Green building or Net Zero Water Max domestic flow for 2500 sqft 2 story home Alternate source for irrigation less than 10 gpm Alternate source for everything 0.0 gpm
21 Water Conservation/Water Quality Paradox Maintaining water quality requires water turnover in distribution systems designed for high fire flow requirements Water conservation continues to reduce water use The result is an ever increasing volume of non revenue demand System Volume Time Ever increasing difference
22 Are we really saving water? Is the success of water conservation programs increasing distribution maintenance water use? No known studies Our preliminary investigation for answers are in no way statistically valid but meant to be food for thought
23 Water Quality Maintenance Maintain chlorine residual throughout the distribution system Re chlorination stations Purging stale water Unidirectional flushing program Automatic flushers
24 Revenue Impacts Water conservation programs have two impacts both result in lower revenue: Reduce revenue water use Increase non revenue water use Customers are paying for water wasted to maintain quality would they rather have used this water they purchased?
25 Rate Impacts How much of the Basic Charge is used to maintain fire suppression readiness? Customers think they are paying for water they use when actually paying for fire protection Willingness to pay issues
26 Reclaimed Water Impacts Reduced domestic flows will reduce the availability of reclaimed water Fulfilling existing contracts could become an issue
27 Reuse Opportunities Flushing of drinking water system also used for flushing maintenance of wastewater system Automatic flushers redirected from waste to alternate source uses such as irrigation Reclaimed water systems for fire protection?
28 Rethink Distribution Design Aging infrastructure replacement creates a huge opportunity to rethink water distribution system design At what point does it make sense to create a dual system? Potable Non potable: fire, irrigation, etc.
29 Food & Drink For Thought The luxury of working in silos is over Holistic water utility management requires cooperation between: Supply side and demand side departments Water, wastewater, reuse services Community conversation to reimagine/redesign basic municipal water system Information flow about water flow
30 Questions? Contact information Jill Hoyenga jill (dot) hoyenga (at) eweb (dot) org Rachel Lanigan rlanigan (at) carollo (dot) com
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