Nonpoint source(NPS) pollution or diffuse pollution refers to the input of pollutants by rainfall or snowmelt from ground. The NPS includes agricultural chemicals sprayed on farmland, excreta discharged from livestock facilities, on-road particles and garbage, sediments, etc.
NPS accounted for 52.6% of the discharged BOD load of the Korean major river watersheds in 2003 and it increased to 68.3% in 2010. The proportion of NPS is expected to increase to 72.1% in 2020 due to more land development and urbanization. To manage NPS multilaterally and systematically in a national level, seven government ministries, including the Prime Minister’s Office and Ministry of Environment, formulated “Comprehensive Plan on Nonpoint Source Management for the Four Major Rivers” in 2004. And the 2nd Comprehensive NPS Management Plan was published in 2012.
In accordance with the 1st Comprehensive Plan on Nonpoint Source Management, the national and local governments were made responsible for NPS management, and the construction of NPS mitigation facilities is mandatorily required to the large land-development activities and wastewater-discharging facilities. Moreover, environment-friendly land use was promoted from the early stages of development and land use projects by continuously applying NPS management provisions to 27 regulations and guidelines associated with environmental impact assessments, city master plans, and forestry legislation. To find out best management practice of NPS at Korean land-use and rainfall characteristics, 46 NPS mitigation facilities were installed and tested at four major rivers including the Han River.
In addition, seven regions where NPS pollution may significantly harm the water use, residents’ health and property, or natural ecosystem were designated as NPS Control Areas and various projects have been implemented to reduce the NPS pollution.
The 2nd Comprehensive Plan on Nonpoint Source Management (2012-2020) promotes the NPS management measures tailored to land-use characteristics such as cities, rural areas, and forests. For example, in urban areas low impact development (LID) technique is applied from the city planning stage in order to minimize the occurrence of NPS pollution. Successful implementation of the 2nd Comprehensive Plan will result in the reduction of the discharged NPS loads by 24.6% (283 tons/day) of BOD and by 22.5% (13 tons/day) of total phosphorus (T-P) in 2020.
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Last modified : 2017-12-12 08:38
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