A Study on the Management of Nonpoint Pollution Source by Precipitation Monitoring by Tributary in Gumho River

In this study, peak concentration was calculated using long -term monitoring results in order to establish nonpoint pollution source management plan for each station.Based on the estimated peak water concentration, the non -point pollution source management method was derived through comparison analysis with various evaluation factors related to runoff.The 113 monitoring results of the Gumho River watershed were statistically analyzed.The number of dry days in the monitoring point was ranged from 1.0 to 14.0 days in each region.Total precipitation was 88.7 ㎜ upstream, 101.3 ㎜ tributary, and 103.1 ㎜ downstream.As a result of analysis of EMCs up to the average peak water quality concentration by pollutant item, BOD was highest in March and April, COD in April, SS in April and August, T-N in April and T-P in August.The peak EMCs of the pollutant up to the average peak pollutant concentration by the monitoring point was high in April -August in the main stream of the Gumho River and between spring and summer in March -August in the tributary.Statistical analysis was conducted using long -term monitoring data, and a non -point pollution source management plan was proposed based on the results of the nationwide pollution source analysis for the target watershed.By analyzing the pollutant ratio by watershed, we can select the main pollutant source and present the nonpoint pollution sources reduction technique suitable for the reduction of the pollutant source, so that it can be used as the basic data for establishing non -point pollutant management plan for the target watershed.