In national water quality policy, it changed previous regulation method that focuses on concentration of pollutants in effluent
water to the way that regulates total amount of pollutants. The target of water quality in watershed of each river was set up,
as the government instituted Total Maximum Daily Loads(TMDL). In order to accomplish successfully TMDL, it requires that
the amount of pollutant loads discharged from point and nonpoint pollutant source should be investigated. This study, therefore,
conducted the monitoring of the stormwater runoff at field region in farming area. And pollutants loads and unit loads
discharged from field region results is calculated. As a result, the concentration of pollutants were calculated as follows: 10.5
BOD mg/L, 19.6 CODMn mg/L , 4.5 TN mg/L and 2.4 TP mg/L. The unit load of BOD, CODMn, TOC, TSS, TN and TP
discharged from field region, also, were determined to 31.8kg/km2/yr, 56.7kg/km2/yr, 8.5kg/km2/yr, 560.9kg/km2/yr, 8.3kg/km2/yr
and 5.1kg/km2/yr, respectively. It was identified that there were some differences of unit loads between the results obtained
from this study and previous one. To calculate exact unit loads, therefore, long term monitoring should be conducted.