18 c) Maintenance The proposed structure to be erected within the drain or drainage reserve shall not inhibit drainage maintenance work. The following provisions for maintenance shall be incorporated i) For elevated structures (such as Rapid Transit
Systems or road viaducts, pedestrian overhead bridges,
buildings, etc) over the drain or drainage reserve Sufficient headroom, viz minimum 5.4 m vertical clearance between the base of the proposed elevated structure and the vehicular maintenance access
within the drainage reserve, shall be provided. Any deviation shall be approved by the Board. ii) For at-grade structures (such as road decks,
pedestrian malls, linkways etc) over the drain or drainage reserve In addition to the provision of gratings and drains as specified in Clause 9.11 and Clause 9.13.4, access openings (4 m by 2 m) with 6 m wide lay-bys shall be provided within the development site but outside the road carriageway or mall. Requirements on the provision for maintenance openings and lay-bys shall be determined and approved by the Board.
(d)
Effective Drainage for Proposed Structure The proposed structure shall be provided with an effective drainage system to intercept and discharge the surface water runoff. Where a slab is built over a roadside drain to provide access to premises, runoff from the slab shall be effectively drained away without causing drainage problem on top of the slab and the adjacent areas.
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