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Urban development has rapidly reduced permeable area through which rainwater is absorbed into the ground, causing side effects such as urban flooding and ground weakening. Responding to this, the Seoul Metropolitan Government has implemented the Ordinance on Water Circulation Restoration and Low Impact Development since January 2014 to obligate installing storm water outflow reduction facility in building structures designed thereafter and newly-developed roads, parks, and green areas, etc.
Legal ground: Seoul Special City’s Framework Ordinance on Water Circulation Restoration and Low Impact Development
Article 11 (Target to install rainwater control facility, etc.)
①Pursuant to Article 16-2(1)28 of the Enforcement Decree of Countermeasure Against Natural Disaster Act,
any person who implements a development project, etc. or manages a public facility in downtown Seoul shall
establish a rainwater outflow reduction measure and install a rainwater outflow reduction facility, in the event
of doing any of the following businesses.
Construction (including new construction, extension, remodeling, reconstruction or relocation) with 2000-mr
lot area or larger or 3000-mr total floor area or larger among those subject to architectural consultation
pursuant to Article 29 Building Act
1.5 Notification on rainwater harvesting amount and average saturation permeability for rainwater
harvesting amount application
◆Notification of Seoul Special City No. 2014-14
Pursuant to Article 6(1) of the Seoul Metropolitan Ordinance on water Circulation Recovery and Low Impact Development, rainwater harvesting amount for rainwater outflow management in each source and average saturation permeability for its application are notified as follows;
Mayor of Seoul Special City
1. Rainwater Harvesting Amount
| Area | Public / Education | Park / Green | Transportation / Infrastructure | Private (Large-scale) |
Private (Small-scale) |
Remark |
| Rainwater Harvesting Amount (mm/hr) |
6.0 | 7.5 | 5.0 | 5.5 | 3.5 |
※Apply the harvesting amount pursuant to land use plan to multiple complexes and urban development (redevelopment) project, etc.
※Private facility (large scale) : lot area of 500m or larger, Private facility (small scale) : lot area under 500m
2. Average permeability for rainwater harvesting amount application : 0.01643m/hr
3. For more details, please contact the Water Management Policy Division (+82-2-2133-2762)
Management facilities recognized by the Seoul Metropolitan Government include a detention tank that harvests and
reuses rainwater falling onto roofs, green roofs, permeable pavements infiltration-type street inlets and infiltration-type trenches.
In reflecting in the Company’s rainwater detention tank and infiltration facility designs, HANKOOKsuan provides a consulting service without additional expense on prior low-impact consultation procedures.
