Projected Reservoir Rating Curves based on elevational sedimentation rates

Regional Water Planning Groups in Texas are required to consider anticipated reservoir sedimentation rates when they simulate reservoir firm yields using the state's Water Availability Models. Using elevational sedimentation rates and recent reservoir volumetric and sedimentation surveys, the TWDB’s Water Availability has developed projected reservoir rating curves for 72 water supply reservoirs in Texas for all water planning decades (i.e., 2030‒2080). For more information on the elevational sedimentation rate method, please see this draft paper.If you have more questions, please contact Dr. John Zhu or the Surface Water Division.

List of reservoir's WAM rating curves


The WAM rating curve for reservoirs data posted here are based on survey data collected by multiple organizations and at various times, processed by the method specified in the study report listed above, and are subject to revision as additional data and/or updates are made available to the TWDB. The dataset may be continuously updated in the future without notice. Neither the State of Texas nor the Texas Water Development Board (TWDB) assumes any legal liability or responsibility for or makes any guarantees or warranties as to the accuracy, completeness, or suitability of the information for any purpose. Please contact TWDB customer service if you have any questions or comments about the dataset.

(last update to data is on 8/8/2022).