Code of practice on surface water drainage



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COP Surface Water Drainage 7th Ed Add. 1
2.2
Crest Level
Crest level is required for all entrances, exits or openings to basements) or underground structures
(e.g. tunnels, underground facilities. The minimum crest level required depends on the type of development, as categorised below a) Basements of General Developments The minimum crest level shall beat least 150 mm above the minimum platform level as specified in Clause a.
(b)
Basements of Industrial/Institutional/Commercial/Multi-Unit Residential Developments The minimum crest level shall beat least 300 mm above the minimum platform level as specified in Clause 2.1.1 (b.
(c)
Underground Special Facilities and Developments with Director Indirect Linkages to Underground Special Facilities, The minimum crest level shall beat least 300 mm above the minimum platform level as specified in Clause 2.1.1 (c.
2.3
Minimum Reclamation Level
For land reclamation works, the minimum reclamation level shall not be lower than i)
4.0 m above Singapore Height Datum for developments along the southern coast and
4.5 m above Singapore Height Datum for developments along the northern coast or ii) Any other levels as maybe specified by the Board. The platform levels required for any development subsequently carried out on the reclaimed land shall be higher than the reclamation level and shall be separately determined by the developer/owner’s Qualified Person to ensure effective internal drainage of the development site.


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2.4 Flood Protection Measures
Flood protection measures as stipulated under Clauses b, band shall comply with the following requirements, including those stipulated in Clause 13 and Appendix 2: a) General Development Flood protection measures shall be provided at all points of entry, exit and all openings including windows, ventilation and services openings) for the building premises (at ground/platform level. b)
Industrial/Institutional/Commercial/Multi-Unit Residential Developments, Special Facilities and Developments with Director Indirect Linkages to Underground Special
Facilities

Flood protection measures shall be provided at i) At all points of entry, exit and all openings (including windows, ventilation and services openings) for the building premises (at ground/platform level or ii) All points of entry and exit for the entire development area. c) The developer/owner shall obtain the necessary clearance from relevant authorities to install the flood protection measures during the Development Control (DC) stage for approval. d) Details of the flood protection measures and Standard Operating Procedure (SOP) should be submitted to the Board during Detailed Plan (DP) stage for record.

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