Often supplementary to the primary drainage
network, secondary drainage systems are installed at 90-degrees
to the main pipes below and incorporate a network of drainage
slits, or drainage bands, into the upper soil structure. These
are closely spaced allowing any excess surface water to drain
away much faster.
Four systems are available:
- Slit drains: Sometimes called sand slits, 50mm wide.
- Shelton System 25™ Micro trenches 25mm wide backfilled
with gravel.
- Shelton System 25™ Micro trenches 35mm wide with 25mm land drainage pipe backfilled with gravel
- Shelton Gravel Band Drainage: Micro bands of gravel 25mm
wide.
Slit drains may be 250-300mm deep, spaced
at 1, 2 or 3 metre centres and are excavated with either the
Shelton Supertrencher or the Shelton System 25™. They are backfilled
with 6-10mm gravel and topped up with coarse free-draining
sand. On certain soil types they may need re-topping after
settlement.
The Shelton
System 25™ consists of 25mm wide trenches, usually 250-300mm
deep, spaced more closely, which are simultaneously filled
with small gravel in a single operation. The surface remains
level and the scars in the turf grow over in a matter of days.
Minimal surface disturbance makes this system highly attractive,
especially for golf green drainage.
Finally, Gravel
Band Drainage is a simple system of narrow slits filled
with gravel, which is now widely accepted as the most cost
effective way to install an intensive drainage system into
established sportsturf.
Please contact
us today to discuss your specific requirements.
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