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A channel that is 1.0 m to 3.0 m in depth is considered to be a deep drain. The drain is excavated to a depth that is sufficient to intercept the watertable in order to capture and convey that groundwater from flat, poorly drained land.
The drain can either be ‘open’ to allow the inflow of surface water or ‘leeved’ to exclude surface water. An open deep drain has its spoil banks placed on one side or on alternate sides of the channel (Figure 1) while a leveed deep drain has continuous spoil banks placed on both sides of the drain channel (Figure 2). Leveed drains are the preferred design in the majority of cases and sites because they prevent surface flows from entering the drain and so reduce the risk of erosion and drain batter collapse.
Number of Pages
Subsurface drainage, Drainage, Salinity, Groundwater, Engineering, Western Australia
Construction Engineering and Management
Cox, N, Tetlow, S, and Coles, N. (2005), Deep drains to manage groundwater. Department of Agriculture and Food, Western Australia, Perth. Bulletin 4617.
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