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Estimating the Contribution of Forests to the Nation's Water Supply
This project has two main goals. The first goal is to
estimate the volumes of water that annually become available on forests
(and other land covers) in the U.S. Available water volume (water supply)
is being estimated, at the regional scale, as precipitation minus evapotranspiration
(ET). Estimating ET at the regional scale for the entire U.S. has been
a major hurdle and is being accomplished in cooperation with scientists
at Colorado State University. The publications listed
below describe our efforts so far to estimate regional ET.
Mean annual contributions to water supply have been estimated for three sets of areas of the coterminous U.S.:
The other goal is to estimate the value of runoff from
national forest areas (see Brown 2004). Work continues toward this goal.
To view PDF files, you will need Adobe Acrobat Reader, available free of charge
- Brown, Thomas C., Michael T. Hobbins, and Jorge A. Ramirez. 2008. Spatial distribution of water supply in the coterminous United States. Journal of the American Water Resources Association. 44(6):1474-1487.
(1.2 MB PDF file)
- Brown, Thomas C., Michael T. Hobbins, and Jorge A. Ramirez. 2005. The Source of Water Supply in the United States. RMRS - RWU 4851 Discussion Paper
(1 MB PDF file)
- Ramirez, Jorge A., Michael T. Hobbins, and Thomas. C.
Brown. 2005. Observational evidence of the complementary relationship in regional
evaporation lends strong support for Bouchet’s hypothesis. Geophysical Research Letters, 32, L15401.
- Brown, Thomas C. 2004. The Marginal Economic Value of Streamflow
From National Forests.
(1 MB PDF file)
- Hobbins, Michael. T., Jorge. A. Ramirez, and Thomas. C.
Brown. 2004. Trends
in pan evaporation and actual evapotranspiration across the conterminous
U.S.: Paradoxical or complementary? Geophysical Research Letters 31(13), L13503.
- Hobbins, Michael T., Jorge A. Ramirez, and Thomas C. Brown. Trends in Regional Evapotranspiration Across
the United States Under the Complimentary Relationship Hypothesis.
In: proceedings of the 21st Annual AGU Hydrology Days, Colorado State
University, Fort Collins, Colorado, April 2-5, 2001, Jorge A. Ramirez
ed., pp. 106-121.
(485 KB PDF file)
- Hobbins, Michael T., Jorge A. Ramirez, Thomas C. Brown,
and Lodevicus H. J. M. Classens. 2001. The
Complementary Relationship in the Estimation of Regional Evapotranspiration:
The Complementary Relationship Areal Evapotranspiration and Advection-Aridity
Models. Water Resources Research 37(5):1367-1387.
(8.5 MB PDF file)
- Hobbins, Michael T., Jorge A. Ramirez, and Thomas C. Brown.
2001. The Complementary Relationship
in the Estimation of Regional Evapotranspiration: An Enhanced Advection-Aridity
Model. Water Resources Research 37(5):1389-1403.
(333 KB PDF file)
- Hobbins, Michael T., Jorge A. Ramirez, and Thomas C. Brown. The Complementary Relationship
in Regional Evapotranspiration: The CRAE Model and the Advection-Aridity
Approach. In: proceedings of the 19th Annual AGU Hydrology Days, Colorado
State University, Fort Collins, Colorado, August 16-20, 1999, Hubert J.
Morel-Seytoux ed., pp. 199-212.
(339 KB PDF file)
- Brown, Thomas C., Benjamin L. Harding, and Elizabeth A.
Payton. 1990. Marginal
Economic Value of Streamflow: A Case Study for the Colorado River Basin. Water Resources Research 26(12): 2845-2859.
(1 MB PDF file)
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