National Water Census Apalachicola-Chattahoochee-Flint River Basin Focus Area Study: Surface water modeling component May 12, 2014 Jacob LaFontaine U.S. Department of the Interior U.S. Geological Survey
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National Water Census Apalachicola-Chattahoochee-Flint River Basin Focus Area Study: Surface water modeling component May 12, 2014
Jacob LaFontaine
U.S. Department of the Interior U.S. Geological Survey
Hydrologic modeling in the ACFB
SERAP Flint River Science Thrust Project
2006 2009 2012
USGS Water Census
Hydrologic modeling goals • Simulate water budget
for entire basin at a ‘coarse’ scale (HUC 12) for the National Water Census
• Simulate streamflow in six subbasins at a ‘finer’ scale for ecological team
• Study effects of climate, land cover, and water use
Hydrologic modeling tasks
• Update existing models through 2012
Hydrologic modeling tasks
• Update existing models through 2012
• Develop water use module for PRMS
Hydrologic modeling tasks
• Update existing models through 2012
• Develop water use module for PRMS
• Incorporate water use into PRMS models
Hydrologic modeling tasks
• Update existing models through 2012
• Develop water use module for PRMS
• Incorporate water use into PRMS models
• Link PRMS to MODFLOW
Hydrologic modeling tasks
• Update existing models through 2012
• Develop water use module for PRMS
• Incorporate water use into PRMS models
• Link PRMS to MODFLOW
• Provide output to Ecology team and NWC
Biologically relevant streamflow statistics
Update existing hydrologic models • Models simulated ‘no-water-
use’ flows for 1951 to 1999.
• Used gridded inputs of air temperature and precipitation
• Update to simulate ‘no-water-use’ flows through 2012 using weather station data (NCDC)
Water use module • Sources of water:
– Streams – Groundwater reservoir – Surface water bodies – External
• Destinations of water:
– Streams – Groundwater reservoir – Surface water bodies – External – Land surface application – Consumption
Incorporating water use • Map water withdrawals and
returns to modeling units – Municipal & Industrial – Agricultural
• Extract water use data from
SWUDS – Monthly time series
• Construct water-use input files
– Automate for future applications
Link PRMS to MODFLOW • Not GSFLOW due to available
time and resources
• Loose coupling (PRMS) – Surface runoff and
interflow simulated by PRMS
– Recharge to MODFLOW simulated by PRMS
PRMS
Recharge to groundwater system
Surface runoff
Interflow
Link PRMS to MODFLOW • Loose coupling (MODFLOW)
– MODFLOW uses PRMS
generated recharge
– Simulates groundwater component of streamflow
Recharge from PRMS
Input to MODFLOW
Groundwater flow to streams
Link PRMS to MODFLOW • Loose coupling (Routing)
– Post process streamflow
using flow components from each model
– Surface runoff and interflow from PRMS
– Groundwater flow from MODFLOW
– Muskingum routing
Groundwater flow to streams
Surface runoff
Interflow
Streamflow
+
+
+ In-stream water use
Products of this study • Water Budget and streamflow
information
• Documented PRMS models for use in future studies
• Loose coupling methodology for SW/GW
• Expanded capabilities of PRMS to incorporate water use data
• Improved understanding of effects of climate, land cover, and water use on streamflow in the ACFB
Upcoming PRMS enhancements • Improved simulation of
surface-depression storage features
• Dynamic parameters
• Combined stream and lake routing
• Stream temperature
• National Hydrologic Model
USGS National Research Program
Modeling of Watershed
Systems
Questions?
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