| Naturalized flows |
TCEQ Water Rights Analysis Package (WRAP) monthly naturalized flows data
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| Lyons Method paper |
Existing reservoir and stream management recommendations: statewide minimum streamflow recommendations, Bounds and Lyons, 1979
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Freshwater Inflows report |
Freshwater inflows to Texas bays and estuaries: ecological relationships and methods for determination of needs - TWDB, 1994
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| NHDPlus |
USGS/EPA National Hydrography Dataset Plus - updated hydrographic mapping data for the United States
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| Texas Regulatory 7Q2 |
Texas Surface Water Quality Standards - §307.10(2), August 17, 2000 - Appendix B: Low-Flow Criteria (seven-day, two-year low flow)
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| NWS flood stage |
U.S. National Weather Service flood stage levels for Texas rivers
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| HEFR |
Hydrology-based Environmental Flow Regime - a downloadable tool developed by TPWD and TWDB for populating a preliminary environmental flow regime matrix
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| MBFIT |
Modified Base Flow Index with Threshold - a downloadable tool developed by Joe Trungale to separate hydrographs into baseflow and runoff components; modified from the U.S. Bureau of Reclamation BFI tool
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| NWIS Analyst |
An online tool to analyze daily streamflow data from the USGS National Water Information System
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| IHA |
The Nature Conservancy’s Indicators of Hydrologic Alteration downloadable software
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| NATHAT |
USGS National Hydrologic Assessment Tool downloadable software
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| HEC-RPT |
U.S. Army Corps of Engineers Hydrologic Engineering Center Regime Prescription Tool downloadable software
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| TXHAT |
USGS/TCEQ Texas Hydrologic Assessment Tool downloadable software and user’s manual (including Texas Stream Classification Tool)
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| Texas less-altered gages |
Lists of less-altered flow regimes by gage and period of record from the USGS/TCEQ TXHAT project
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| Texas more-altered gages |
Lists of more-altered flow regimes by gage and period of record from the USGS/TCEQ TXHAT project
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| TXHAT output |
USGS/TCEQ Texas Hydrologic Assessment Tool - Texas streamflow analysis output data
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