17 b) Developments at lower ground i) If the earth retaining structure is erected at a development site where the ground level
is lower than adjacent ground, the earth retaining structure shall not in anyway obstruct existing subsoil and overland flows that are discharging through the development site from the adjacent premises. ii) The flows shall be drained off by cutoff drains located along the top and bottom of the retaining wall within the development site or other drainage system as proposed by the Qualified Person. These cutoff drains shall be properly connected to an existing roadside/outlet drain and maintenance access shall be provided to facilitate access to the cutoff drains.
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