This type of drain is mainly used for broad area farming where
open drains can be incorporated into the property management.
The land area, catchment area, soil types and topography are information
that is required to design an effective surface drainage system.
Sub Surface Drainage Design
These drains are usually associated with intensive agriculture
areas such as grapes or vegetables. The land area, rainfall, soil
types, outlet areas and topography is required
information to design an effective subsurface drainage system.
There are many sub surface pipe products on the market that can
be used for drainage. Product use depends on the water volume discharge, soil type, longevity of the product, maintenance requirements and product cost.
Soil types and profiles are important for a successful drainage
design. The effect on the ground water table by the drains will
be limited by the permeability or water flow through the soil.
Drains are generally used to improve winter or summer waterlogged
areas on the property. The reduction of surface ponding is required
within a 24 to 48 hour period so that annual or perennial crops
can grow and produce.
Open drains are generally cheaper to construct, maintain and
can be more effective. The subsurface drains are more expensive
to develop because of trench excavation, pipe product required and back fill material.