Ground-water availability planning for Sustainable Future Water Supplies South


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GROUND-WATER AVAILABILITY

  • Planning for Sustainable Future Water Supplies South

  • of the C&D Canal


OVERVIEW

  • CONCEPTS

  • HISTORICAL PERSPECTIVE

  • CURRENT STATUS

  • PLANNING FOR THE FUTURE



MAJOR CONCEPTS

  • Ground water is the only naturally occurring source for fresh potable water

  • Desalinization is very expensive

  • Surface water is not an option



MAJOR CONCEPTS



MAJOR CONCEPTS

  • There is a lot of good information available, but

  • Increased demand for aquifers to be used for wastewater and stormwater disposal, and ASR

  • Reliable estimates of availability use all available data in an appropriate model and are presented as a range of values



HISTORICAL PERSPECTIVE OF GROUND-WATER AVAILABILITY STUDIES 1950’s – 1960’s

  • Simple water budgets

  • Analytic equations with gross assumptions

  • Regional scale

  • Limited data – few dozen to few hundred observation points

  • Identification of aquifer/geologic units hampered by lack of data



HISTORICAL PERSPECTIVE OF GROUND-WATER STUDIES 1970’s – 1990’s

  • Availability determined from simple water budget and analytic models

  • A few more complex numerical models of limited areal scope were constructed

  • Local to regional studies

  • Focused data collection by topic or geography

  • Most aquifer units identified with modern data and terminology



HISTORICAL PERSPECTIVE OF GROUND-WATER STUDIES 2000 to present

  • Local to regional studies

  • More complex numerical models for specific problems

  • Multiple large datasets of hydrogeologic conditions and infrastructure

  • Focus of projects is to provide numerical data suitable for use in detailed ground-water flow models

  • Identify where aquifers are connected



CURRENT PROJECTS

  • Domestic well water quality – (DCC)

  • Confined aquifers in KC

  • Aquifer thickness in KC

  • KC surficial geologic map

  • Database development and upgrades

  • USACE steady state model of NNCC

  • TMDL efforts



WHERE WE ARE GOING

  • Many cooperators

  • SNCC confined aquifers

  • Automation of gw, sw, and climate measurements

  • KC transmissivity

  • SC confined aquifers …..

  • SC surficial geologic map







Hydraulics of Unconfined Aquifer and intersection with Manokin Aquifer – Sussex Co.



MOVING TO SOLVE PRIORITY PROBLEMS: THE TWO Qs

  • QUANTITY

  • Poorly constrained estimates of gw availability

  • Streamflow depletion

  • Wastewater, stormwater, and ASR

  • Declining gw levels in confined aquifers



NEEDS FOR WATER SUPPLY PLANNING

  • Better tools and information to more effectively manage and plan ……

  • Basic data measurements – levels, flow, hydraulics, and chemistry

  • Improved pumping data

  • Numerical flow simulation based estimates – steady state then transient

  • 10 year life cycle of model tools



SUSTAINABLE DEVELOPMENT STUDY COMPONENTS

  • Aquifer characterization (geometry& hydraulics)

  • GW levels, stream discharge (localized)

  • Characterize water use at appropriate time scales (pumping and disposal)

  • Linkage to SW models and TMDL issues



RIBS/Stormwater/ASR Study Components

  • Phased investigation

  • Pre-treatment

  • Hydraulics and modeling

  • Field performance

  • Geochemistry/Contaminant transport

  • Stream/well impacts



WHAT ELSE IS NEEDED FOR PLANNING ? DISCUSS PRIORITY AREAS AND DEVELOP A WORK PLAN AND SCHEDULE

  • Southern NCC/Northern KC

  • Eastern SC

  • Central to southern KC

  • Northern NCC

  • Western SC

  • Impact of wastewater on water supply



EXPLORATION STUDY COMPONENTS

  • Test drilling and lithologic characterization of geologic units

  • Multi-level wells and characterization of hydraulic and chemical properties of aquifers (Spatial distribution of 10,000 mg/L TDS in Potomac aquifers in SNCC and NKCo; Cheswold and deeper in ESC)

  • Depths > 2500 ft




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