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Delaware River Basin Commission - New Jersey Delaware River Basin Commission The State of the Basin - 2019 Watersheds and Water Use Chad Pindar, P.E. Manager of Water Resource Planning,

Aug 08, 2020

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  • Delaware River Basin Commission

    The State of the Basin - 2019

    Watersheds and Water Use

    Chad Pindar, P.E.

    Manager of Water Resource Planning, DRBC

    WRA DRB , Fall Technical Symposium

    November 6, 2019, Bordentown, NJ

    Photo: David Mark, via Pixabay

  • Indicators

    Watersheds / Landscapes

    ▪ Population

    ▪ Land Cover

    ▪ Impervious Cover

    Water Quantity

    ▪ Water Withdrawals

    ▪ Consumptive Use

    ▪ Groundwater Availability

  • ▪ 2016: ~8.3 million basin residents

    ▪ 2030: Projected to be 9 million

    Population

  • ▪ Most up-to-date data published by Shippensburg University

    ▪ 1-meter resolution, LiDAR-based, 12 land cover classes

    ▪ Predominantly Forested – especially Upper Basin

    ▪ More urbanized around Wilmington – Philadelphia - Trenton corridor

    ▪ Action: continue to update high-resolution landcover over time for trends

    ▪ Management of growth will help mitigate negative impacts to source waters, water quality and aquatic life

    Landcover

  • ▪ NOAA Coastal Change Analysis Program (CCAP) data for trends.

    ▪ Development is primarily from Forest and Agricultural lands

    Landcover

  • ▪ Good indicator of “stream health”

    ▪ Roads, parking lots, rooftops, etc.

    ▪ Prevents infiltration of rainfall, adds to runoff, reduces GW recharge

    ▪ Watersheds with >10% I.C.- stream health begins to decline

    ▪ Utilized NOAA CCAP for analysis

    Impervious Cover

  • ▪ Most of the basin is currently below the 10% threshold.

    ▪ Restoration: Stormwater retrofits in areas above 10%

    ▪ Protection: Management ordinances and BMPs in areas below 10%

    Impervious Cover

  • Basin Water Use

  • ▪ Measuring and reporting water use has greatly improved since the 1990’s

    ▪ Stable or decreasing trends

    Water Use Trends – 3 Key Sectors

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    Basinwide water use by sector PWS Industrial Thermo

  • ▪ Population growth

    ▪ PWS sector use is relatively flat

    ▪ Attributed to conservation efforts

    ▪ Similar at a national scale

    Water Use Trends – Public Water Supply

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    Total use: Public water supply

    Consumptive Use Trend in Total WD DRB Population Trend

  • ▪ 300 PWS utility systems submit audits yearly

    ▪ 156 MGD is leaked

    ▪ $132 million in non- revenue water

    Water Auditing for PWS Sector

  • ▪ Consumptive Use is stable in the DRB

    ▪ Action: Confirm C.U. factors by sector

    Water Use Trends – Consumptive Use

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    Basinwide consumptive use by sector PWS Industrial Thermo

  • ▪ Thermoelectric is the one sector where we have seen C.U. increases

    ▪ Management / replacement program for this sector

    Consumptive Use – Thermoelectric Generation

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    Consumptive water use: Thermoelectric Power Generation Moving Avg. Trendline

  • Groundwater Use &

    Availability

    ▪ Majority of Basin is in very good shape

    ▪ Below the “potentially stressed” threshold

  • A.

    B.

    0

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    1987 1992 1997 2002 2007 2012

    M ill

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    Moving Ave. Trendline

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    1990 1995 2000 2005 2010 2015 M

    ill io

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    Well is in the depleted zone of a regulated aquifer

    Well is in the threatened margin of a regulated aquifer

    GW: Special Management Areas

  • ▪ Watersheds for analysis are smaller than those used for basin-wide assessment

    ▪ One watershed that is “Stressed” is due to a quarry

    ▪ Sustainable withdrawals

    Southeast PA Groundwater Protected Area

  • Indicator Summary Present Condition / Trend

    Present Condition / Trend

    Recommendations

    Recommendations

    Status

    Status

  • Chad Pindar, P.E. Water Resource Planning Section Manager

    [email protected] www.drbc.gov

    Managing, Protecting and Improving the Basin’s Water Resources since 1961

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