Streamflow data collection and analysis are a necessary component of effective water resource management and planning. Low-flow statistics are needed to safely allow withdraws from and discharges to surface waters in the State of New Jersey. Operating streamflow gaging stations at every water use location would be ideal but is cost prohibitive. Statistics help extend the utility of available data and provide reliable information for a fraction of the cost of operating streamgages.
Estimates of various flow statistics at un-gaged locations are available from USGS web applications such as “StreamStats”, in which regional equations based on physical basin characteristics are used to transfer flow information from long-term continuous gages. These flow estimates are based on streamgage data that are considered to be un-impacted by water use or regulation, and are considered “natural”. The low-flow statistics needed for water management in the context of this project do require inclusion of the effects of water use and regulation. A vast network of partial-record sites in New Jersey reflects these altered flows, and makes it possible to estimate “actual” rather than a presumed “natural” condition. The estimates are site specific and attempt to represent at-site conditions as much as the available data allow.
Methods used for the calculation of the low-flow statistics at ungaged sites are documented in the reports, “Streamflow Characteristics and Trends in New Jersey, Water Years 1897-2003” (U.S. Geological Survey Scientific Investigations Report 2005-5105) and “Implementation of an R Script to Implement MOVE.1, Censored MOVE.1, and Piecewise MOVE.1 Low-Flow Regressions with Applications at Partial-Record Streamgaging Stations in New Jersey” (U.S. Geological Survey Open File Report 2018-1089).
To provide a publicly available, citable repository of the computed low flow statistics at ungaged locations in New Jersey, the pertinent information of each estimate is made available in an annual data release in Science Base (https://www.sciencebase.gov/catalog/item/5b4cd524e4b06a6dd17aca26). The data releases include the stream name, location, method, and intended use of the low-flow statistics computed during the specified water year. The data are provided as both a plain text file and an ArcGIS shapefile format.
This project is made possible through cooperative agreements between the New Jersey Department of Environmental Protection (NJDEP) and USGS.
Below are other science projects associated with this project.
Low-Flow Characteristics - Archive
Below are publications associated with this project.
Implementation of MOVE.1, censored MOVE.1, and piecewise MOVE.1 low-flow regressions with applications at partial-record streamgaging stations in New Jersey
Streamflow characteristics and trends in New Jersey, water years 1897-2003
Below are partners associated with this project.
- Overview
Streamflow data collection and analysis are a necessary component of effective water resource management and planning. Low-flow statistics are needed to safely allow withdraws from and discharges to surface waters in the State of New Jersey. Operating streamflow gaging stations at every water use location would be ideal but is cost prohibitive. Statistics help extend the utility of available data and provide reliable information for a fraction of the cost of operating streamgages.
Estimates of various flow statistics at un-gaged locations are available from USGS web applications such as “StreamStats”, in which regional equations based on physical basin characteristics are used to transfer flow information from long-term continuous gages. These flow estimates are based on streamgage data that are considered to be un-impacted by water use or regulation, and are considered “natural”. The low-flow statistics needed for water management in the context of this project do require inclusion of the effects of water use and regulation. A vast network of partial-record sites in New Jersey reflects these altered flows, and makes it possible to estimate “actual” rather than a presumed “natural” condition. The estimates are site specific and attempt to represent at-site conditions as much as the available data allow.
Methods used for the calculation of the low-flow statistics at ungaged sites are documented in the reports, “Streamflow Characteristics and Trends in New Jersey, Water Years 1897-2003” (U.S. Geological Survey Scientific Investigations Report 2005-5105) and “Implementation of an R Script to Implement MOVE.1, Censored MOVE.1, and Piecewise MOVE.1 Low-Flow Regressions with Applications at Partial-Record Streamgaging Stations in New Jersey” (U.S. Geological Survey Open File Report 2018-1089).
To provide a publicly available, citable repository of the computed low flow statistics at ungaged locations in New Jersey, the pertinent information of each estimate is made available in an annual data release in Science Base (https://www.sciencebase.gov/catalog/item/5b4cd524e4b06a6dd17aca26). The data releases include the stream name, location, method, and intended use of the low-flow statistics computed during the specified water year. The data are provided as both a plain text file and an ArcGIS shapefile format.
This project is made possible through cooperative agreements between the New Jersey Department of Environmental Protection (NJDEP) and USGS.
- Science
Below are other science projects associated with this project.
Low-Flow Characteristics - Archive
To determine regional low-flow relationships for both the 2-year and 10-year 7-day low flows throughout New Jersey, so that accurate estimations of these values at ungaged sites can be made - Publications
Below are publications associated with this project.
Implementation of MOVE.1, censored MOVE.1, and piecewise MOVE.1 low-flow regressions with applications at partial-record streamgaging stations in New Jersey
The U.S. Geological Survey (USGS) uses Maintenance of Variance Extension Type 1 (MOVE.1) regression to transfer streamflows measured at long-term continuous-record streamgaging stations to partial-record (PR) streamgaging stations where intermittent base-flow measurements are available. MOVE.1 regression is used widely throughout the hydrologic community to extend historic low flows and low-flow sAuthorsSusan J. Colarullo, Samantha L. Sullivan, Amy R. McHughStreamflow characteristics and trends in New Jersey, water years 1897-2003
Streamflow statistics were computed for 111 continuous-record streamflow-gaging stations with 20 or more years of continuous record and for 500 low-flow partial-record stations, including 66 gaging stations with less than 20 years of continuous record. Daily mean streamflow data from water year 1897 through water year 2001 were used for the computations at the gaging stations. (The water year is tAuthorsKara M. Watson, Robert G. Reiser, Steven P. Nieswand, Robert D. Schopp - Partners
Below are partners associated with this project.