• Lee, Ju-Young (Environmental remediation and Ecological restoration Lab., KIST-Gangneung Institute) ;
  • Choi, Jae-Young (Environmental remediation and Ecological restoration Lab., KIST-Gangneung Institute)
  • Published : 2006.08.31


Recently, the population growth, industrial and agricultural development are rapidly undergoing in the Lower Rio Grande Valley (LRGV) in Texas. The Lower Rio Grande Valley (LRGV) composed of the 4 counties and three of them are interesting for Non-point and point source pollutant modeling: Starr, Cameron, and Hidalgo. Especially, the LRGV is an intensively irrigation region, and Texas A&M University Agriculture Program and the New Mexico State University College of Agriculture applied irrigation district program, projects in GIS and Hydrology based agricultural water management systems and assessment of prioritized protecting stream network, water quality and rehabilitation based on water saving potential in Rio Grande River. In the LRGV region, where point and non-point sources of pollution may be a big concern, because increasing fertilizers and pesticides use and population cause. This project objective seeks to determine the accumulation of non-point and point source and discuss the main impacts of agriculture and environmental concern with water quality related to pesticides, fertilizer, and nutrients within LRGV region. The GIS technique is widely used and developed for the assessment of non-point source pollution in LRGV region. This project shows the losses in $kg/km^2/yr$ of BOD (Biological Oxygen Demand), TN (total Nitrogen) and TP (total phosphorus) in the runoff from the surface of LRGV. Especially, farmers in Cameron County consume a lot of fertilizer and pesticide to improve crop yield net profit. Then, this region can be created as larger nonpoint source area for nutrients and the intensity of runoff by excess irrigation water. And many sediment and used irrigation water with including high nutrients can be discharged into Rio Grade River.



  1. Guy Fipps and Craig Pope., 'Implementation of a district management system in the Lower Rio Grande Valley of Texas', annual report ( 1998)
  2. Jenson, S. K. and Domingue, J. O., 'Extracting Topographic Structure from Digital Elevation Data for Geographic Information System Analysis,' Photogrammetric Engineering and Remote Sensing, 54(11). pp.1593-1600 (1988)
  3. Kim, H. Go, and Kim, T. K., 'Water quality management in Dae-Chung Ho by Remote sensing technique', J. of KSEE, 18(10), pp, 1383-1396 (1996)
  4. Kim, Ho Y., Jeong, T. S., and Kim, J. K., 'Study on the Construction of the Water Quality Management System using a GIS on Semankum Watershed,' J. of KSEE, 22(8), pp 1503 -1512 (2000)
  5. Kim, H. Y., Choi, K. S., Kim, S. H., Ju, W. H., You, M. S., Kim, J. S., and Lee, B. H., 'A Study of Nonpoint Source Quality in Kyung An River Water,' J. of KSEE, fall (1999)
  6. Kwun, S. H., 'Management Improvement and Perspective on Nonpoint Source of Water Pollution in Korea,' J. of KSEE, 20(11), pp 1497-1510 (1998)
  7. L.M. Tronstad, R. O. Hall, and T. M. Koel. 'Decline in nitrogen transported by Yellowstone cutthroat trout spawning migrations', Presented at the NABS Annual meeting, Vancouver, British Columbia (2004)
  8. Na, E. H., and Choi, K. S., and Park, S. S., 'A Nonpoint Source Model for Suburban Watershed with Agricultural Runoff,' J. of KSEE, fall (1999)
  9. U.S. EPA, 'Paper presented at the 14th Technical Conference on Contemporary Challenges in Irrigation and Drainage', U. S. Committee on Irrigation and Drainage, Phoenix, June 3-6 (1998)
  10. Puckett, L. J., 'Identifying the Major Sources of Nutrient Water Pollution', Environmental Science & Technology, 29(1), 408A-414A(1995)
  11. Saunders, W. K. and D. R. Maidment, 'Grid -Based Watershed and Stream Network Delineation for the San Antonio-Nueces Coastal Basin; Proceedings,' Texas Water Resources Engineering, August 16-17, American Society of Civil Engineers, San Antonio, TX (1995)
  12. U.S. EPA, '1990 National Water Quality Inventory-305(b)' Report to Congress, Washington, DC (1992)
  13. U.S. EPA, 'The Quality of Our Nation's Water. 1994. Executive Summary of the National Water Quality Inventory': 1994 Report to United States Congress. EP A841-S-94-002, USEPA, Washington, D.C.(1994)
  14. U.S. Department of Agriculture, Soil Conservation Service (1972)