Trend analysis for sites used in RESTORE Streamflow alteration assessments

Daily streamflow discharge data from 139 streamgages located on tributaries and streams flowing to the Gulf of Mexico were used to calculate mean monthly, mean seasonal, and decile values. Streamgages used to calculate trends required a minimum of 65 years of continuous daily streamflow data. These values were used to analyze trends in streamflow using the Mann-Kendall trend test in the R package entitled “Trends” and a new methodology created by Robert M. Hirsch known as a “Quantile-Kendall” plot. Data were analyzed based on water year using the Mann-Kendall trend test and by climate year using the Quantile-Kendall methodology to: (1) identify regions which are statistically similar for estimating streamflow characteristics; (2) identify trends related to changing streamflow and streamflow alteration over time; and (3) to identify possible correlations with estuary health in the Gulf of Mexico.

Data and Resources

Field Value
accessLevel public
bureauCode {010:12}
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
identifier USGS:5b218df6e4b092d9652874cd
metadata_type geospatial
modified 20200821
old-spatial -99.997286999997, 27.220882, -81.817304, 34.666749
publisher U.S. Geological Survey
publisher_hierarchy Department of the Interior > U.S. Geological Survey
resource-type Dataset
source_datajson_identifier true
source_hash 670851b7f22dba37291099ac2a180c8ee6b1ab94
source_schema_version 1.1
spatial {"type": "Polygon", "coordinates": [[[-99.997286999997, 27.220882], [-99.997286999997, 34.666749], [ -81.817304, 34.666749], [ -81.817304, 27.220882], [-99.997286999997, 27.220882]]]}
theme {geospatial}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • alabama
  • amerigeo
  • amerigeoss
  • ckan
  • environmental-flow
  • florida
  • geo
  • geoss
  • gulf-coast
  • gulf-of-mexico
  • louisiana
  • mississippi
  • national
  • network-optimization
  • north-america
  • reference-hydrology
  • restore
  • southeastern-united-states
  • streamflow-alteration
  • texas
  • trend-analysis
  • united-states
  • usgs-5b218df6e4b092d9652874cd
isopen False
license_id notspecified
license_title License not specified
maintainer Rodgers, Kirk D.
maintainer_email krodgers@usgs.gov
metadata_created 2025-11-21T20:55:42.687088
metadata_modified 2025-11-21T20:55:42.687092
notes Daily streamflow discharge data from 139 streamgages located on tributaries and streams flowing to the Gulf of Mexico were used to calculate mean monthly, mean seasonal, and decile values. Streamgages used to calculate trends required a minimum of 65 years of continuous daily streamflow data. These values were used to analyze trends in streamflow using the Mann-Kendall trend test in the R package entitled “Trends” and a new methodology created by Robert M. Hirsch known as a “Quantile-Kendall” plot. Data were analyzed based on water year using the Mann-Kendall trend test and by climate year using the Quantile-Kendall methodology to: (1) identify regions which are statistically similar for estimating streamflow characteristics; (2) identify trends related to changing streamflow and streamflow alteration over time; and (3) to identify possible correlations with estuary health in the Gulf of Mexico.
num_resources 2
num_tags 23
title Trend analysis for sites used in RESTORE Streamflow alteration assessments