Maryland-Delaware-D.C. Water Science Center

Data and Tools

Filter Total Items: 203
Date published: January 1, 2018

Attributes for NHDPlus Version 2.1 Catchments and Modified Routing of Upstream Watersheds for the Conterminous United States: Contact Time

This tabular data set represents contact time, the length of time it takes for water to drain along subsurface flow paths to the stream, compiled for two spatial components of the NHDPlus version 2 data suite (NHDPlusv2) for the conterminous United States; 1) individual reach catchments and 2) reach catchments accumulated upstream through the river network. This dataset can be linke

Date published: January 1, 2018

Attributes for NHDPlus Version 2.1 Reach Catchments and Modified Routed Upstream Watersheds for the Conterminous United States: National Inventory of Dams (NID) Storage and Construction by Decade, 1930 to 2010

This tabular data set contains decadal information on dams compiled for two spatial components of the NHDPlus version 2 data suite (NHDPlusv2) for the conterminous United States; 1) individual reach catchments and 2) reach catchments accumulated upstream through the river network. This dataset can be linked to the NHDPlus version 2 data suite by the unique identifier COMID. The source

Date published: January 1, 2018

Attributes for NHDPlus Version 2.1 Catchments and Modified Routing of Upstream Watersheds for the Conterminous United States: Estimated 30-Year (1971-2000) Average Annual Runoff Based on Flow Measured at Streamgages, Millimeters per Year

This tabular data set represents estimated 30-year (1971-2000) average annual runoff in millimeters per year compiled for two spatial components of the NHDPlus version 2 data suite (NHDPlusv2) for the conterminous United States; 1) individual reach catchments and 2) reach catchments accumulated upstream through the river network. This dataset can be linked to the NHDPlus version 2 d

Date published: January 1, 2018

Attributes for NHDPlus Version 2.1 Catchments and Modified Routing of Upstream Watersheds for the Conterminous United States: Physiographic Provinces

This tabular data set represents the percent of physiographic provinces compiled for two spatial components of the NHDPlus version 2 data suite (NHDPlusv2) for the conterminous United States; 1) individual reach catchments and 2) reach catchments accumulated upstream through the river network. This dataset can be linked to the NHDPlus version 2 data suite by the unique identifier COMID.

Date published: January 1, 2018

Attributes for NHDPlus Version 2.1 Catchments and Modified Routing of Upstream Watersheds for the Conterminous United States: 30 Year (1971 - 2000) Mean Annual Maximum Temperature (Celsius) from 800m PRISM data

This tabular data set represents 30 year (1971 - 2000) mean annual maximum temperature (Celsius) from 800m PRISM data compiled for two spatial components of the NHDPlus version 2 data suite (NHDPlusv2) for the conterminous United States; 1) individual reach catchments and 2) reach catchments accumulated upstream through the river network. This dataset can be linked to the NHDPlu

Date published: January 1, 2018

Attributes for NHDPlus Version 2.1 Reach Catchments and Modified Routed Upstream Watersheds for the Conterminous United States: Consecutive Wet Days

This tabular data set represents the average number of consecutive days with measurable precipitation for the period between 1871 and 1997, compiled for two spatial components of the NHDPlus version 2 data suite (NHDPlusv2) for the conterminous United States; 1) individual reach catchments and 2) reach catchments accumulated upstream through the river network. This dataset can be link

Date published: January 1, 2018

Attributes for NHDPlus Version 2.1 Reach Catchments and Modified Routed Upstream Watersheds for the Conterminous United States: Average Annual Runoff (mm) from McCabe and Wolock's Runoff Model 1951-2000

This data set represents the average annual runoff (mm) from McCabe and Wolock's Runoff Model 1951-2000 value compiled for two spatial components of the NHDPlus version 2 data suite (NHDPlusv2) for the conterminous United States; 1) individual reach catchments and 2) reach catchments accumulated upstream through the river network (i.e., watersheds). This dataset can be linke

Date published: January 1, 2018

Attributes for NHDPlus Version 2.1 Catchments and Modified Routing of Upstream Watersheds for the Conterminous United States: NAWQA Wall-to-Wall Anthropogenic Land Use Trends (NWALT)

This tabular data set contains information on historic anthropogenic land use trends, compiled for two spatial components of the NHDPlus version 2 data suite (NHDPlusv2) for the conterminous United States; 1) individual reach catchments and 2) reach catchments accumulated upstream through the river network. This dataset can be linked to the NHDPlus version 2 data suite by the unique i

Date published: November 1, 2017

Annual Winter-Spring Nitrogen Loading for the Susquehanna and Potomac Rivers, 1985 to 2016

Stations Analyzed are 01578310 - SUSQUEHANNA RIVER AT CONOWINGO, MD and 01646580 - POTOMAC RIVER AT CHAIN BRIDGE NEAR WASHINGTON, DC Spring nitrogen loads as measured at the Susquehanna River at Conowingo Maryland and Potomac River at Washington, D.C. have been determined to be an effective indicator of summer anoxic and hypoxic volume in Chesapeake Bay. The U.S. Geological Survey (USGS%

Date published: September 30, 2017

Sediment-sample and climate data for the agricultural and forested parts of Smith Creek watershed, Virginia (2012-2015)

This metadata record covers 5 comma delimited ascii files that contain sediment source sample data, sediment target sample data, quantitation limits for samples, and daily temperature data. This data release is a companion to the journal article Sediment fingerprinting to delineate sources of fine-grained sediment in the agricultural and forested Smith Creek watershed, Virginia (2012-20

Date published: September 7, 2017

Nitrogen and phosphorus from fertilizer and manure in the Chesapeake Bay watershed, 1950-2012

This dataset contains four tables of estimates of the yearly sum of nitrogen and phosphorus inputs from fertilizer applications and from manure applications in selected watersheds in Chesapeake Bay drainage basin from 1950 to 2012. For the fertilizer data, county-level loads were used from three published sources. Data from 1950 to 1985 are from Alexander and Smith (1990). Data for the year...

Date published: July 18, 2017

Animal Best Management Practice by Chesapeake Bay Watershed Region from 1985 to 2014

This metadata record covers 18 comma delimited files that support the USGS Scientific Investigations Report Manure and Fertilizer Inputs to Land in the Chesapeake Bay Watershed, 1950-2014 by Jennifer Keisman, Olivia Devereux, Andrew LaMotte, and Andrew Sekellick. The data were created by running scenarios through the Chesapeake Bay Program Partnership Phase 5.3.2 Watershed Model for years