The variable aperture choke drain releases water at a predetermined rate. When the retention system exceeds the maximum storage capability, the emergency overflow pipe allows water to bypass the choke drain, allowing maximum flow.
Graf Choke Drain Shaft Overview
Typical infiltration application:
Swale ditch stormwater solutions:
Using Graf percolation filtration systems, infiltration through swale-ditches can be accomplished regardless of soil conditions. Depending on the soil’s infiltration/adsorption performance (Kf), stormwater control can be achieved through a balance of infiltration and retention.
For delayed outflow into the drainage system, the Graf Choke Drain Shaft is the ideal solution. By adjusting the variable choke drain aperture, stormwater flow to the drainage field can be precisely controlled while providing a parallel path for emergency overflow.
A secondary benefit of swale-ditch infiltration is the cleaning effect the soil layer provides for the rainwater. This characteristic makes it particularly suitable for larger projects having higher levels of pollution in the surface water as occurs frequently in industrial applications.
Choke Drain Plate Details:
Choke Drain Shaft Dimensions:
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