Long Island Water Availability

Science Center Objects

The foundation of any groundwater analysis, including those analyses whose objective is to propose and evaluate alternative management strategies, is the availability of high-quality data. Some, such as precipitation data, are generally available and relatively easy to obtain at the time of a hydrologic analysis. Other data and information, such as geologic and hydrogeologic maps, can require years to develop. Still other data, such as a history of water levels in different parts of groundwater systems, require foresight in order to obtain measurements over time, if they are to be available at all.

A key starting point for assuring a sustainable future for any groundwater system is development of a comprehensive hydrogeologic database over time. These data ideally, should include depths and thicknesses of hydrogeologic units from lithologic and geophysical well logs, synoptic and historic water-level measurements to allow construction of pre-development water-level maps for major aquifers (as well as water-level maps at various times during development), groundwater quality analyses to document pre-development and post-development water quality, and simultaneous measurements of streamflow and stream quality during low flows to indicate possible impacts of discharging groundwater to surface-water quality (Alley and others, 1999).



Table of Contents

State of the Aquifer, Long Island, New York - Introduction

Location and Physical Setting


  1. Hydrolgeologic Units
  2. Fresh and Saltwater Relations/Interactions

State of the Aquifer System

  1. Precipitation
  2. NWIS - the USGS Data Archive 
  3. Surface Water - Streamflow
  4. Groundwater Levels
  5. Water Table and Surface Maps
  6. Water Use
  7. Groundwater Budget
  8. Inflow to the Groundwater System
  9. Outflow from the Groundwater System
  1. Case Studies

Interactive Content