Development of effective management plan for critical subwatersheds using SWAT model

The present investigation is an effort to develop an effective management plan for the identified critical subwatersheds of Nagwan watershed located in the eastern part of India using a precalibrated and validated Soil and Water Assessment Tool (SWAT) model. In all 60 combinations of various management treatments including crops (rice, maize, peanut and soybean), tillage (zero, conservation, field cultivator, mould board plough and conventional practices) and levels of fertilizer (existing, half of recommended and recommended) have been studied. This study revealed that crops like maize, peanut and soybean could not replace rice since they resulted in higher sediment yield compared to rice. The tillage practice with mould board plough has been found to have a more appreciable impact on the sediment and nutrient losses than conventional tillage practices for the existing level of fertilizer. Sediment yield decreased in case of zero tillage, conservation tillage and field cultivator compared to conventional tillage. On the other hand, nutrient losses increased in case of zero and conservation tillage for all levels of fertilizer compared to the other tillage treatments. In conclusion it can be stated that the sediment yield is highest in case of mould board plough followed by conventional tillage field cultivator, conservation tillage and least in zero tillage practices, whereas the nutrient losses were found to be just in the reverse order with tillage practices, indicating highest nutrient losses in mould board plough tillage practices. In view of the sediment yield and nutrient losses, the conventional tillage practice was considered to be the best as the sediment yield is less than the average soil loss and nutrient loss is within the permissible limit. Copyright © 2005 John Wiley & Sons, Ltd.

[1]  J. Arnold,et al.  VALIDATION OF THE SWAT MODEL ON A LARGE RWER BASIN WITH POINT AND NONPOINT SOURCES 1 , 2001 .

[2]  J. Nash,et al.  River flow forecasting through conceptual models part I — A discussion of principles☆ , 1970 .

[3]  Raghavan Srinivasan,et al.  Alternative River Management Using a Linked GIS-Hydrology Model , 1995 .

[4]  R. Bagnold.  Bed load transport by natural rivers , 1977 .

[5]  A. M. Duda,et al.  Addressing Nonpoint Sources of Water Pollution Must Become an International Priority , 1993 .

[6]  Raghavan Srinivasan,et al.  Effect of watershed subdivision on simulation runoff and fine sediment yield , 1997 .

[7]  Raghavan Srinivasan,et al.  INTEGRATION OF A BASIN‐SCALE WATER QUALITY MODEL WITH GIS , 1994 .

[8]  R. G. Spomer,et al.  Dissolved nitrogen and phosphorus in runoff from watersheds in conservation and conventional tillage , 1985 .

[9]  J. Hamlett,et al.  Hydrologic calibration of the SWAT model in a watershed containing fragipan soils , 1998 .

[10]  Steven T. Bednarz,et al.  LARGE AREA HYDROLOGIC MODELING AND ASSESSMENT PART II: MODEL APPLICATION 1 , 1998 .

[11]  J. M. Hollis,et al.  SWAT—A Semi-empirical Model to Predict Concentrations of Pesticides Entering Surface Waters from Agricultural Land , 1996 .

[12]  S. Mostaghimi,et al.  IDENTIFICATION OF CRITICAL NONPOINT POLLUTION SOURCE AREAS USING GEOGRAPHIC INFORMATION SYSTEMS AND WATER QUALITY MODELING , 1992 .

[13]  K. Mcgregor,et al.  PLANT NUTRIENT LOSSES IN RUNOFF FROM CONSERVATION TILLAGE CORN , 1984 .

[14]  John R. Williams,et al.  Sediment yield prediction based on watershed hydrology. , 1977 .

[15]  I. Abrol,et al.  Soil erosion rates in India , 1992 .

[16]  Raghavan Srinivasan,et al.  Nonpoint Source (NPS) Pollution Modeling Using Models Integrated with Geographic Information Systems (GIS) , 1993 .

[17]  Raghavan Srinivasan,et al.  Water resources of the Texas Gulf Basin , 1999 .

[18]  Drainage Division,et al.  Criteria for Evaluation of Watershed Models , 1993 .

[19]  Ronald L. Bingner,et al.  Runoff simulated from goodwin creek watershed using SWAT , 1996 .

[20]  A. Rango,et al.  MERITS OF STATISTICAL CRITERIA FOR THE PERFORMANCE OF HYDROLOGICAL MODELS1 , 1989 .

[21]  S. Dressing,et al.  ES Feature: Pollution from Nonpoint Sources. , 1987, Environmental science & technology.

[22]  K. Mcgregor,et al.  Nitrogen and Phosphorus Losses in Runoff from No-Till Soybeans , 1980 .

[23]  Raghavan Srinivasan,et al.  CONTINENTAL SCALE SIMULATION OF THE HYDROLOGIC BALANCE 1 , 1999 .

[24]  John R. Williams,et al.  LARGE AREA HYDROLOGIC MODELING AND ASSESSMENT PART I: MODEL DEVELOPMENT 1 , 1998 .

[25]  M. J. M. Römkens,et al.  Nitrogen and Phosphorus Composition of Surface Runoff as Affected by Tillage Method 1 , 1973 .

[26]  John R. Williams,et al.  A modeling approach to determining the relationship between erosion and soil productivity [EPIC, Erosion-Productivity Impact Calculator, mathematical models] , 1984 .

[27]  Jeffrey G. Arnold,et al.  APPLICATION OF SWAT FOR THE UPPER NORTH BOSQUE RIVER WATERSHED , 2000 .