This online report from the Food and Agriculture Organization of the United Nations is a rich resource on evapotranspiration. The document includes a comprehensive introduction to evapotranspiration, methods of calculation, and an examination of evapotranspiration in crops. The report is easy to navigate with a detailed table of contents; navigational buttons; and links to figures, tables, and...

Penned by Balazs M. Fekete, Charles J. Vorosmarty, and Wolfgang Grabs of the University of New Hampshire's Global Hydrology Group, this report entitled "Global, Composite Runoff Fields Based on Observed River Discharge and Simulated Water Balances" explains "the potential of combining observed river discharge information with [a] climate-driven Water Balance Model in order to develop composite...

This Web site contains a June 2003 report from the Economic Research Service of U.S. Department of Agriculture. The report offers a detailed analysis of livestock and poultry manure management for water quality in the U.S. The studies included in the report occur on multiple scales: 1) a farm-level analysis of "on-farm technical choice and producer costs" across the U.S., 2) a regional analysis of...