||Development of a Mathematical Model to Predict the Role of Surface Runoff and Groundwater Flow in Overfertilization of Surface Waters.
Strau, Conrad P. ;
Johnso, Jack D. ;
||Minnesota Univ., Minneapolis. Water Resources Research Center.
||WRRC-Bull-35; DI-14-01-0001-1914; OWRR-B-012-MINN; 11400,; B-012-MINN(1)
( Water pollution ;
Mathematical models) ;
( Fertilizers ;
Surface water runoff) ;
( Surface water runoff ;
Water pollution) ;
Stream flow ;
Nitrogen inorganic compounds ;
Phosphorous inorganic compounds ;
Agricultural wastes ;
New Prague watershed ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
A nutrient enrichment accounting mathematical model was devised for the New Prague watershed in Minnesota. The New Prague watershed is 23.3 square miles in area and is predominately a rural watershed. Model input data was collected over a 2 1/2-year period from a stream gaging station and two automatic sampling stations. Over 800 water samples were analyzed. Extensive effort was placed on better understanding the nitrogen and phosphorus cycles. It is evident that the spring runoff process and accumulative winter fertilizer applications constitute the major portion of diffuse sources of nutrients in the watershed. Point sources from feedlots and municipal and industrial effluents contribute only 11 percent of the annual Epsilon N (total nitrogen, four components) and 7 percent TP (total phosphorus). (Author)