PWD Water Supply Planning: Introduction Regulated Flow Advisory Committee May 24, 2018 Presented to an advisory committee of the DRBC on May 24, 2018. Contents should not be published or re ‐ posted in whole or part without permission of PWD.
Water Supply Planning Introduction 1. Utility overview 2. The need for planning 3. Planning scope Presented to an advisory committee of the DRBC on May 24, 2018. Contents should not be published or 2 re ‐ posted in whole or part without permission of PWD.
Presented to an advisory committee of the DRBC on May 24, 2018. Contents should not be published or re ‐ posted in whole or part without permission of PWD. PWD Water Supply Planning Multi ‐ year water supply planning effort • Designed to support parallel water and wastewater • infrastructure planning efforts Critical need to understand the potential risks to • infrastructure, regulatory compliance and public health of current and future water quality and quantity Water supply planning , specifically, is focusing on three • critical drivers ‐ Climate change ‐ Ambient water quality changes ‐ Policy changes 3 | WATER SUPPLY PLANNING
Philadelphia Water Department Drinking Water • 1.7 million drinking water customers • 3 Water Treatment Plants Wastewater • 2.2 million wastewater customers • 3 Water Pollution Control Plants Stormwater • 60% Combined, 40% Separate Sewers • Large ‐ scale green infrastructure pgm. Presented to an advisory committee of the DRBC on May 24, 2018. Contents 4 | WATER SUPPLY should not be published or re ‐ posted in whole or part without permission of PWD.
Presented to an advisory committee of the DRBC on May 24, 2018. Contents should not be published or re ‐ posted in whole or part without permission of PWD. Why is Water Supply Planning Needed? Climate changes – sea level has 2020s 2050s 2080s • 0.8 ft. 2.4 ft. 4.5 ft. risen ~0.64 feet since 1960 (0.2 m) (0.7 m) (1.4 m) Ambient water quality changes CUSP 90 th pcntl. projections for sea • level rise from a 2000 ‐ 2004 baseline Policy changes • Source: Climate Central, 2017 (5 ft. SLR over MHHW) 5 | WATER SUPPLY PLANNING | Climate change will exacerbate salinity intrusion
Presented to an advisory committee of the DRBC on May 24, 2018. Contents should not be published or re ‐ posted in whole or part without permission of PWD. Why is Water Supply Planning Needed? Climate changes • Ambient water quality changes • Policy changes • Delaware River at Trenton Chloride 1955 ‐ 2018 60 50 Chloride, mg/L 40 30 20 10 0 1955 1958 1961 1964 1967 1970 1973 1976 1979 1982 1985 1988 1991 1994 1997 2000 2003 2006 2009 2012 2015 6 | WATER SUPPLY PLANNING | Freshwater chlorides have tripled since the 1960s
Presented to an advisory committee of the DRBC on May 24, 2018. Contents should not be published or re ‐ posted in whole or part without permission of PWD. Why is Water Supply Planning Needed? Climate changes • Ambient water quality changes – chlorides have tripled • Policy changes • Delaware River at Trenton Chloride 1955 ‐ 2018 60 NOW 50 Chloride, mg/L GOOD FAITH 40 AGREEMENT 60s 30 DROUGHT 20 10 0 1955 1958 1961 1964 1967 1970 1973 1976 1979 1982 1985 1988 1991 1994 1997 2000 2003 2006 2009 2012 2015 7 | WATER SUPPLY PLANNING | Freshwater chlorides have tripled since the Decree and Good Faith Agr.
Presented to an advisory committee of the DRBC on May 24, 2018. Contents should not be published or re ‐ posted in whole or part without permission of PWD. Why is Water Supply Planning Needed? Climate changes • Ambient water quality – 1960s drought led to salinity policies • Policy changes • 1960s Chloride at PWD and Trenton PWD Chloride Trenton Chloride 50 During intrusion, ocean salt reaches 40 PWD, increasing Chloride, mg/L chloride 30 20 10 0 Apr ‐ 64 Jun ‐ 64 Aug ‐ 64 Oct ‐ 64 Dec ‐ 64 Feb ‐ 65 Apr ‐ 65 Jun ‐ 65 Aug ‐ 65 Oct ‐ 65 Dec ‐ 65 8 | WATER SUPPLY PLANNING | Chloride during the worst salinity intrusion event in the Delaware River
Presented to an advisory committee of the DRBC on May 24, 2018. Contents should not be published or re ‐ posted in whole or part without permission of PWD. Why is Water Supply Planning Needed? Climate changes • Ambient water quality – 1960s drought led to salinity policies • Policy changes • PWD Chloride Trenton Chloride 1960s Chloride and Streamflow Trenton, CFS 50 5,000 4,500 40 4,000 Discharge, CFS 3,500 Chloride, mg/L 30 3,000 2,500 20 2,000 1,500 10 1,000 500 0 0 Apr ‐ 64 Jun ‐ 64 Aug ‐ 64 Oct ‐ 64 Dec ‐ 64 Feb ‐ 65 Apr ‐ 65 Jun ‐ 65 Aug ‐ 65 Oct ‐ 65 Dec ‐ 65 9 | WATER SUPPLY PLANNING | Chlorides today are equivalent to those during the drought of record
Presented to an advisory committee of the DRBC on May 24, 2018. Contents should not be published or re ‐ posted in whole or part without permission of PWD. Why is Water Supply Planning Needed? Major Takeaway #1 Ambient chloride concentrations today are equivalent to the worst salinity intrusion of record in the 1960s Salinity intrusion chloride = ambient chloride + ocean salt 10 | WATER SUPPLY PLANNING
Presented to an advisory committee of the DRBC on May 24, 2018. Contents should not be published or re ‐ posted in whole or part without permission of PWD. FFMP Table 1 Interstate Operation Formula Montague Trenton NYC Storage Condition Objective, CFS Objective, CFS Normal (L1, L2) 1,750 3,000 Drought Watch (L3) 1,650 2,700 Drought Warning (L4) 1,550 2,700 Drought Emergency (L5) 1,100 ‐ 1,650 2,500 ‐ 2,900 11 | WATER SUPPLY PLANNING | Current flow objectives are designed to prevent salinity intrusion
Presented to an advisory committee of the DRBC on May 24, 2018. Contents should not be published or re ‐ posted in whole or part without permission of PWD. FFMP Table 2 Drought Emergency Flow Objectives Trenton Montague River Objective, CFS Objective, CFS Mile Dec. May Sept. Dec. May Sept. Location – Apr. ‐ Aug. ‐ Nov. – Apr. ‐ Aug. ‐ Nov. > RM 92.5 2,700 2,900 2,900 1,600 1,650 1,650 RM 87 ‐ 92.5 2,700 2,700 2,700 1,350 1,600 1,500 RM 82.9 ‐ 87 2,500 2,500 2,500 1,350 1,600 1,500 < RM 82.9 2,500 2,500 2,500 1,100 1,100 1,100 12 | WATER SUPPLY PLANNING | Current flow objectives are designed to prevent salinity intrusion
Presented to an advisory committee of the DRBC on May 24, 2018. Contents should not be published or re ‐ posted in whole or part without permission of PWD. Why is Water Supply Planning Needed? Climate changes • Ambient water quality changes • Policy changes – policies created in ‘84 to manage low flow • PWD Chloride Trenton Chloride 1960s Chloride and Streamflow Trenton, CFS 50 5,000 4,500 40 4,000 Discharge, CFS 3,500 Chloride, mg/L 30 3,000 FFMP FLOW TARGETS 2,500 20 2,000 1,500 10 1,000 500 0 0 Apr ‐ 64 Jun ‐ 64 Aug ‐ 64 Oct ‐ 64 Dec ‐ 64 Feb ‐ 65 Apr ‐ 65 Jun ‐ 65 Aug ‐ 65 Oct ‐ 65 Dec ‐ 65 13 | WATER SUPPLY PLANNING | FFMP flow targets are designed to prevent blue from falling below red
Presented to an advisory committee of the DRBC on May 24, 2018. Contents should not be published or re ‐ posted in whole or part without permission of PWD. Why is Water Supply Planning Needed? Climate changes • Ambient water quality changes • Policy changes – the ‘84 policies, now in FFMP, work well today • 2016 ‐ 17 Streamflow Trenton, CFS 50 5,000 4,500 40 4,000 Discharge, CFS 3,500 Chloride, mg/L 30 3,000 FFMP FLOW TARGETS 2,500 20 2,000 1,500 10 1,000 500 0 0 Apr ‐ 16 Jun ‐ 16Aug ‐ 16Oct ‐ 16Dec ‐ 16Feb ‐ 17Apr ‐ 17 Jun ‐ 17Aug ‐ 17Oct ‐ 17Dec ‐ 17 14 | WATER SUPPLY PLANNING | FFMP targets maintain flow within protective range (red)
Presented to an advisory committee of the DRBC on May 24, 2018. Contents should not be published or re ‐ posted in whole or part without permission of PWD. Why is Water Supply Planning Needed? Climate changes • Ambient water quality changes • Policy changes – targets prevent intrusion, not ambient chl. • PWD Chloride Trenton Chloride 2016 ‐ 17 Streamflow Trenton, CFS 50 5,000 4,500 40 4,000 Discharge, CFS 3,500 Chloride, mg/L 30 3,000 FFMP FLOW TARGETS 2,500 20 2,000 1,500 10 1,000 500 0 0 Apr ‐ 16 Jun ‐ 16Aug ‐ 16Oct ‐ 16Dec ‐ 16Feb ‐ 17Apr ‐ 17 Jun ‐ 17Aug ‐ 17Oct ‐ 17Dec ‐ 17 15 | WATER SUPPLY PLANNING | Even with working flow targets, chlorides are higher than during 1960s
Presented to an advisory committee of the DRBC on May 24, 2018. Contents should not be published or re ‐ posted in whole or part without permission of PWD. Why is Water Supply Planning Needed? Climate changes • Ambient water quality changes • Policy changes • PWD Chloride Trenton Chloride 2016 ‐ 17 Streamflow '16 ‐ '17 Trenton, CFS '64 ‐ '65 Trenton, CFS 50 5,000 4,500 40 4,000 Discharge, CFS 3,500 Chloride, mg/L 30 3,000 FFMP FLOW TARGETS 2,500 20 2,000 1,500 10 1,000 500 0 0 Apr ‐ 16Jun ‐ 16Aug ‐ 16Oct ‐ 16Dec ‐ 16Feb ‐ 17Apr ‐ 17Jun ‐ 17Aug ‐ 17Oct ‐ 17Dec ‐ 17 16 | WATER SUPPLY PLANNING | FFMP flow targets are critical to preventing salinity intrusion
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