Code of practice on surface water drainage
Outfall Structure for Drain Connecting to the Sea
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| 4.11 Outfall Structure for Drain Connecting to the Sea All outfall structures shall be extended under and beyond the sandbar area in an encased form and to discharge flow at below the low tide level. Where there is no sandbar formation along the shore, the outfall structure maybe in an open or encased form subject to the approval of the Board. In all cases, the outfall shall extend adequately beyond the shoreline such that the seabed level is at least 500 mm below the outfall invert at the point of discharge. All outfall structures shall be protected against undermining and scouring effects. 16 5 STRUCTURES WITHIN OR ADJACENT TO DRAIN/DRAINAGE RESERVE 5.1 No Structure Within Drain/Drainage Reserve No structure shall be constructed within a drain or drainage reserve. 5.2 Drain Connection Within Drainage Reserve Drain connection within a drainage reserve shall be closed to maintain the continuity of access along the drainage reserve. The closed drain or the slab and its supporting structure/foundation shall be designed for heavy vehicular loading in accordance with Land Transport Authority’s standards. 5.3 Embankments and Structures Adjacent to Drain/Drainage Reserve All embankments and structures shall beset outside the drainage reserve. They shall be stable and independent of the drainage structures. The design of embankments and structures near a drain or drainage reserve must not take into consideration the passive resistance offered by the existing or proposed drainage structures. The embankments and structures shall be stable when excavations up tom below the invert or proposed invert of the adjacent drain are carried out. In addition, the Qualified Person shall ensure that the embankments and structures can be built without affecting the drainage structures. 5.3.1 Download 3.37 Mb. Share with your friends:
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