Tommy Dewald - Western Governors' Association

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Ehnancements to NHDPlus • Version 1 • Released in 2006 • NHD, WBD, NED circa 2005 • Stream Flow Estimation Approaches » Vogel Regression-based » Unit Runoff Method (UROM) • Version 2 • To be released in 2011 • Latest NHD, WBD, NED • Stream Flow Estimation Approaches » Vogel Regression-based » Enhanced Runoff Method (EROM)
Improved Ingredient Data for Flow Estimates • PRISM Temperature and Precipitation (1971-2000) • Annual and Monthly Runoff (4km grid) • USGS NWIS Streamflow Gage Network Locations (30,000) • Divergence Fractions (major) • Water Flow Additions, Removals & Inter-basin Transfers (major) • TBD – NID Dam Network Locations
Page 1 and 2: National Hydrography Dataset Plus (
Page 3 and 4: NHDPlus Concepts • Why - To devel
Page 5 and 6: NHDPlus Concepts: Integration of NH
Page 8 and 9: Drainage Area Delineation Based Upo
Page 10 and 11: NHDPlus Concepts: Navigation of the
Page 12 and 13: NHDPlus Concepts: Watershed Charact
Page 14 and 15: NHDPlus Concepts: Linkage to USGS S
Page 16 and 17: WATERS Data Architecture (Watershed
Page 18 and 19: Co-Occurrence of Impaired Waters an
Page 20 and 21: USGS NAWQA SPARROW Models for Major
Page 24 and 25: Enhanced Runoff Model (EROM) - Flow
Page 26: Questions Tommy Dewald, USEPA Offic

Tommy Dewald - Western Governors' Association

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