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Num of 7 Day Flows > 10th percentile (events/year) [U.S. Fish and Wildlife Service]

U.S. Fish & Wildlife Service · 2022 Full Details

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Title
Num of 7 Day Flows > 10th percentile (events/year) [U.S. Fish and Wildlife Service]
Description
Summary A study by the U.S. Geological Survey (USGS), in cooperation with the Gulf Coastal Plains and Ozarks Landscape Conservation Cooperative (GCPO LCC) and the Department of Interior Southeast Climate Adaptation Science Center, evaluated the hydrologic response of a daily time step hydrologic model to historical observations and projections of potential climate and land cover change for the period 1952-2099. An application of the Precipitation Runoff Modeling System (PRMS) was used to develop the hydrologic simulations. The model simulations were used to compute the potential changes in hydrologic response across the southeastern U.S. using historical observations of climate and streamflow, and 13 downscaled general circulation models with four representative concentration pathways representing a range of potential future changes in climate. The PRMS simulated hydrologic response within the entire geographic study area - the model domain. The model domain was subset into small local watersheds delineating areas expected to have a similar hydrologic response due to changes in the model inputs. These local watersheds are called "hydrologic response units" or HRUs. The PRMS computes flow generated locally on each HRU for each time step. These flow components then are directed to stream segments (SEGs) for flow aggregation. These segments connect the network of HRUs to simulate accumulated streamflow from the upstream watershed. Each HRU and SEG has a unique ID. For each HRU and SEG, 52 summary streamflow metrics (Index of Hydrologic Alteration or IHA metrics) were calculated based on the daily flow outputs. A description of each IHA metric may be found here (streamflow_description_table.xlsx). The summary information presented here shows geospatial results from three main components: 1) The future percent difference from historical conditions for each HRU and SEG and for each of 50 IHA metrics (two metrics excluded due to a predominance of missing values). The results are based on the difference between future conditions in 2045-2075 and historical conditions from 1952-2005. Values are expressed as the percent difference based on a median of 45 future scenarios. https://www.sciencebase.gov/catalog/item/597b37bbe4b0a38ca27563d4 Data source - HRU: "Summary of percent change in statistics by GCM/RCP scenario by HRU" stats_difference_hru_gcm_v2_csv Data source - SEG: "Summary of percent change in statistics by GCM/RCP scenario by SEG" stats_difference_seg_gcm_v2_csv Purpose The streamflow statistics were selected to describe streamflow conditions that may be most useful in defining the suitability for each river or stream to support sustaining populations of priority aquatic species across the GCPO LCC. The data presented here are intended to provide more easily accessible landscape scale summary information in support of the USGS flow modeling project.
Creator
U.S. Fish & Wildlife Service
Temporal Coverage
Last Modified: 2022-03-29
Date Issued
2020-10-26
Rights
The United States Fish and Wildlife Service (Service) shall not be held liable for improper or incorrect use of the data described and/or contained herein. While the Service makes every reasonable effort to ensure the accuracy and completeness of data provided for distribution, it may not have the necessary accuracy or completeness required for every possible intended use. The Service recommends that data users consult the associated metadata record to understand the quality and possible limitations of the data. The Service creates metadata records in accordance with the standards endorsed by the Federal Geographic Data Committee.As a result of the above considerations, the Service gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of the data. It is the responsibility of the data user to use the data in a manner consistent with the limitations of geospatial data in general and these data in particular. Although these data have been processed successfully on a computer system at the Service, no warranty, expressed or implied, is made regarding the utility of the data on another system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This applies to the use of the data both alone and in aggregate with other data and information.
Access Rights
Public
Format
ArcGIS DynamicMapLayer
Language
English
Date Added
August 10, 2025
Provenance Statement
The metadata for this resource was last retrieved from U.S. Fish and Wildlife Service Open Data on 2025-08-24.

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  • Citation
    U.S. Fish & Wildlife Service (2020). Num of 7 Day Flows > 10th percentile (events/year) [U.S. Fish and Wildlife Service]. . https://gis-fws.opendata.arcgis.com/datasets/fws::num-of-7-day-flows-10th-percentile-events-year (web service)
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