Clean water is essential for all of us; however, because of a dense population in a state like Texas it is difficult to keep all surface water as clean as would be preferred. Therefore regulations have to be set to ensure the quality of Texas Surface Water. The State of Texas has established standards to guard the surface water, how it is used and measurements to keep track of whether the water is clean enough for the certain use. The Texas Natural Resource Conservation Commission (TNRCC) in association with other agencies divides rivers and lakes into "Water Quality Segments" for the purpose of monitoring the quality of water as a whole for each part. If the water in a segment fails to meet water quality standards, the segment will become a part of what is called 303d-list and a procedure to clean this segment has to be defined.
The project of defining Water Quality Segments, and produce methods to clean those who do not meet the quality standards is named "
Total Maximum Daily Load" (TMDL). Currently the water quality issues of Trinity River Basin are being considered and the digital delineation of watershed drainage areas for the water quality segments is a part of the procedure.In this term project a preparation for the watershed delineation was done. In this paper the objectives of the project will be discussed, the origin and form of data used and some of the steps in the procedure will be followed. Finally some conclusion of the project will be set forth, what has been done and the future work.
