Base Flow (1966-2009) and Streamflow Gain and Loss (2010) of the Brazos River from the New Mexico-Texas State Line to Waco, Texas.

摘要

This report describes the results of base-flow analysis of historical streamflow data at 11 long-term USGS streamflow-gaging stations for water years 19662009 (October 1965 through September 2009) and two synoptic streamflow gain loss surveys during June and October 2010 in the upper Brazos River Basin from the New MexicoTexas State line downstream to near Waco, Tex. For each of the 11 long-term USGS streamflow-gaging stations, base-flow indexes were determined and statistically tested to assess if they changed over time. Streamflow gains and losses based on streamflow data collected from 66 measurement sites (June 2010) and 68 measurement sites (October 2010) on the Brazos River and selected tributaries are presented, and the respective gaining and losing reaches are identified. Contributions of streamflow to the main channels of each of the five subbasins composing the upper Brazos River Basin are described.