Water-level measurements from observation wells are the principal source of information about the hydrologic stresses acting on aquifers and how these stresses affect groundwater recharge, storage, and discharge (Taylor and Alley, 2001). Water-level measurements are made by many Federal, State, and local agencies.
The Active Groundwater Level Network contains water levels and well information from more than 20,000 wells that have been measured by the USGS or USGS cooperators at least once within the past 13 months. These wells are measured for a variety of disparate purposes, such as statewide monitoring programs, or more local effects like monitoring well drawdown, hydrologic research, aquifer tests, or even earthquake effects on water levels.
Source: http://groundwaterwatch.usgs.gov/statemap.asp?sc=36&sa=NY
On Long Island and in the five boroughs of New York City the USGS operates over 600 active groundwater data-collection stations that provide long-term, accurate, and unbiased information that meets the needs of many diverse users. Details of the current groundwater monitoring on Long Island and the five boroughs of New York City are available at http://ny.water.usgs.gov/projects/LI_PRJ/.
These "groundwater watch" web pages group related wells and data from these active well networks, and provide basic statistics about the water-level data collected by USGS water science centers for Cooperative Programs, for Federal Programs, and from data supplied to us by our customers through cooperative agreements. USGS Groundwater Watch is maintained by the Office of Groundwater, and more groundwater watch web pages are available at http://groundwaterwatch.usgs.gov/ (figure 20). In addition to the active groundwater level network, all groundwater watch web pages for New York are available here: "Real-Time Groundwater Level Network" , "Below Normal Groundwater Levels" , "Long-Term Groundwater Data Network" or "Climate Response Network."
The groundwater database within NWIS contains records from about 850,000 wells Nationwide that have been compiled during the course of groundwater hydrology studies over the past 100 years. Information from these wells is served via the Internet through the National Water Information System Web Interface, NWISWeb. NWISWeb provides all USGS groundwater data that are approved for public release. This large number of sites is excellent for some uses, but complicates retrievals when the user is interested in specific networks, or wells in an active water-level measurement program. The National Water Information System Web Interface, NWISWeb provides all USGS groundwater data that are approved for public release. Groundwater current conditions are based on the most recent data from on-site automated recording equipment. Measurements are commonly recorded at a fixed interval of 15 to 60 minutes and transmitted by satellite uplink or telephone to the USGS every hour. Values may include "Approved" (quality-assured data that may be published) and/or more recent "Provisional" data (of unverified accuracy and subject to revision).
Out of about 100 sites in New York, there are over 10 sites on Long Island that provide current data collection, which is mostly provisional. The data can be found by clicking on this link groundwater current conditions or viewed in a map interface to download data.
Historical instantaneous groundwater data from these sites are also available. A summary of all data for each day (daily data) for the period of record and may represent the daily mean, median, maximum, minimum, and/or other derived value is available at about 50 groundwater sites on Long Island. Values may include "Approved" (quality-assured data that may be published) and/or more recent "Provisional" data (of unverified accuracy and subject to revision).
Manual measurements of depth to water in wells are used to supplement and (or) verify the accuracy of the automatically recorded observations. There are over 4,300 groundwater sites on Long Island that can be selected which have at least one water level measurement (depth to water measurement).
Statistics are computed from approved daily mean data at each site. Statistical summaries of approved historical daily values for daily, monthly, and annual (water year or calendar year) time periods are also available. There are around 50 groundwater sites on Long Island, with daily, monthly, or annual statistics of the measured groundwater elevation in feet above NGVD 1929.
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Table of Contents
State of the Aquifer, Long Island, New York - Introduction
- Precipitation
- NWIS - the USGS Data Archive
- Surface Water - Streamflow
- Groundwater Levels
- Water Table and Surface Maps
- Water Use
- Groundwater Budget
- Inflow to the Groundwater System
- Outflow from the Groundwater System
Below are other science projects associated with this project.
Long Island Water Availability
Long Island Precipitation
NWIS - the USGS Data Archive
Long Island Surface Water - Streamflow
Long Island Water Table and Surface Maps
Long Island Water Use
Long Island Groundwater Budget
Long Island Inflow to the Groundwater System
Long Island Outflow from the Groundwater System
Long Island Water Suitability
Long Island Water Suitability Case Studies
Long Island Groundwater System Potential Hazards
- Overview
Water-level measurements from observation wells are the principal source of information about the hydrologic stresses acting on aquifers and how these stresses affect groundwater recharge, storage, and discharge (Taylor and Alley, 2001). Water-level measurements are made by many Federal, State, and local agencies.
The Active Groundwater Level Network contains water levels and well information from more than 20,000 wells that have been measured by the USGS or USGS cooperators at least once within the past 13 months. These wells are measured for a variety of disparate purposes, such as statewide monitoring programs, or more local effects like monitoring well drawdown, hydrologic research, aquifer tests, or even earthquake effects on water levels.
Source: http://groundwaterwatch.usgs.gov/statemap.asp?sc=36&sa=NY
On Long Island and in the five boroughs of New York City the USGS operates over 600 active groundwater data-collection stations that provide long-term, accurate, and unbiased information that meets the needs of many diverse users. Details of the current groundwater monitoring on Long Island and the five boroughs of New York City are available at http://ny.water.usgs.gov/projects/LI_PRJ/.
Sources/Usage: Public Domain.Figure 20. An example map of groundwater watch locations for Nassau County, New York.(Public domain.) These "groundwater watch" web pages group related wells and data from these active well networks, and provide basic statistics about the water-level data collected by USGS water science centers for Cooperative Programs, for Federal Programs, and from data supplied to us by our customers through cooperative agreements. USGS Groundwater Watch is maintained by the Office of Groundwater, and more groundwater watch web pages are available at http://groundwaterwatch.usgs.gov/ (figure 20). In addition to the active groundwater level network, all groundwater watch web pages for New York are available here: "Real-Time Groundwater Level Network" , "Below Normal Groundwater Levels" , "Long-Term Groundwater Data Network" or "Climate Response Network."
The groundwater database within NWIS contains records from about 850,000 wells Nationwide that have been compiled during the course of groundwater hydrology studies over the past 100 years. Information from these wells is served via the Internet through the National Water Information System Web Interface, NWISWeb. NWISWeb provides all USGS groundwater data that are approved for public release. This large number of sites is excellent for some uses, but complicates retrievals when the user is interested in specific networks, or wells in an active water-level measurement program. The National Water Information System Web Interface, NWISWeb provides all USGS groundwater data that are approved for public release. Groundwater current conditions are based on the most recent data from on-site automated recording equipment. Measurements are commonly recorded at a fixed interval of 15 to 60 minutes and transmitted by satellite uplink or telephone to the USGS every hour. Values may include "Approved" (quality-assured data that may be published) and/or more recent "Provisional" data (of unverified accuracy and subject to revision).
Out of about 100 sites in New York, there are over 10 sites on Long Island that provide current data collection, which is mostly provisional. The data can be found by clicking on this link groundwater current conditions or viewed in a map interface to download data.
Historical instantaneous groundwater data from these sites are also available. A summary of all data for each day (daily data) for the period of record and may represent the daily mean, median, maximum, minimum, and/or other derived value is available at about 50 groundwater sites on Long Island. Values may include "Approved" (quality-assured data that may be published) and/or more recent "Provisional" data (of unverified accuracy and subject to revision).
Manual measurements of depth to water in wells are used to supplement and (or) verify the accuracy of the automatically recorded observations. There are over 4,300 groundwater sites on Long Island that can be selected which have at least one water level measurement (depth to water measurement).
Statistics are computed from approved daily mean data at each site. Statistical summaries of approved historical daily values for daily, monthly, and annual (water year or calendar year) time periods are also available. There are around 50 groundwater sites on Long Island, with daily, monthly, or annual statistics of the measured groundwater elevation in feet above NGVD 1929.
_______________________________
Table of Contents
State of the Aquifer, Long Island, New York - Introduction
- Precipitation
- NWIS - the USGS Data Archive
- Surface Water - Streamflow
- Groundwater Levels
- Water Table and Surface Maps
- Water Use
- Groundwater Budget
- Inflow to the Groundwater System
- Outflow from the Groundwater System
- Science
Below are other science projects associated with this project.
Long Island Water Availability
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...Long Island Precipitation
The National Oceanic and Atmospheric Administration (NOAA) National Climatic Data Center (NCDC) offers several types of climate information generated from examination of the data in the archives. These types of information include record temperatures, record precipitation and snowfall, climate extreme statistics, and other derived climate products. A collection of statistical weather and climate...NWIS - the USGS Data Archive
As part of the U.S. Geological Survey's (USGS) program for disseminating water data within USGS, to USGS cooperators, and to the general public, the USGS maintains a distributed network of computers and fileservers for the acquisition, processing, review, and long-term storage of water data. This water data is collected at over 1.5 million sites around the country and at some border and...Long Island Surface Water - Streamflow
Surface water current conditions are based on the most recent data from on-site automated recording equipment. Measurements are commonly recorded at a fixed interval of 15 to 60 minutes and transmitted by satallite uplink or telephone telemetry to the USGS every hour. Values may include "Approved" (quality-assured data that may be published) and/or more recent "Provisional" data (of unverified...Long Island Water Table and Surface Maps
The depth to the water table can be determined by installing wells that penetrate the top of the saturated zone just far enough to respond to water table fluctuations. Preparation of a water-table map requires that only wells that have their well screens installed near the water table be used. If the depth to water is measured at a number of such wells throughout an area of study, and if those...Long Island Water Use
The U.S. Geological Survey's National Water-Use Information Program (NWUIP) is responsible for compiling and disseminating the nation's water-use data. The USGS works in cooperation with local, State, and Federal environmental agencies to collect water-use information. USGS compiles these data to produce water-use information aggregated at the county, state, and national levels. Every five years...Long Island Groundwater Budget
A groundwater system consists of a mass of water flowing through the pores or cracks below the Earth's surface. This mass of water is in constant motion. Water is constantly added to the system by recharge from precipitation, and water is constantly leaving the system as discharge to surface water and as evapotranspiration. Each groundwater system is unique in that the source and amount of water...Long Island Inflow to the Groundwater System
Precipitation that infiltrates and percolates to the water table is Long Island's only natural source of freshwater because the groundwater system is bounded on the bottom by relatively impermeable bedrock and on the sides by saline ground water or saline bays and the ocean. About one-half the precipitation becomes recharge to the groundwater system; the rest flows as surface runoff to streams or...Long Island Outflow from the Groundwater System
The flow of water leaving, or discharging, the groundwater system of Long Island occurs naturally through streams, as base flow, at the coastline as shoreline discharge and sub-sea discharge, and through pumping wells as withdrawals. Estimates of each component of outflow from the groundwater system is presented and summarized in this section using streamflow measurements, and a compilation of...Long Island Water Suitability
Groundwater quality may be affected by natural and human factors (Johnston, 1988). Although the vulnerability of groundwater to contamination from the land surface is influenced by many factors, the degree of aquifer confinement, the depth of the well, and the surrounding land use are primary key factors that influence shallow groundwater quality.Long Island Water Suitability Case Studies
A collection of studies that focused on the quality of groundwater and surface water, are presented in this section. The reports associated with these areas of water quality concerns are linked as an online source for further reading.Long Island Groundwater System Potential Hazards
Hazards which may impact the ground water system adversely are presented in this web page. The impacts of these hazards are only shown here as a topic for further discussion and may need to be investigated with further details.