Level Spreaders - Catchments and Creeks

Catchments & Creeks Pty LtdV2 February 2010 Page 1 Level Spreaders DRAINAGE CONTROL TECHNIQUELow Gradient Velocity ControlShort Term Steep Gradient[1]Channel LiningMedium-Long Term Outlet Control Soil TreatmentPermanent [1] Level Spreaders can release sheet flow down steep slopes, but the Level spreader itself must beconstructed across a Level 1 Diversion drains (centre) collectstormwater from roadside table drains,then releases the water as sheet flow via alevel spreaderPhoto 2 Level spreader established todischarge stormwater from a diversiondrain into the roadside propertyKey Principles1. Flow must be released from the Level spreader as sheet Flow must be released over a stable, well-grassed surface that will maintain suitable flowconditions down the Critical design parameter is the length of the outlet Critical operational parameter is the Level construction of the outlet InformationThe length of the outlet sill (weir) of the Level spreader is governed by the design discharge, andthe allowable flow velocity of the down-slope flow velocity for grassed surfaces can be determined from Table dimension can be determined from Tables 2 and sill length is 4 sill length is 25 metres.

© Catchments & Creeks Pty Ltd V2 February 2010 Page 5 Maintenance 1. Inspect the level spreader after every rainfall event until vegetation is established.

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  Levels, Spreader, Level spreaders

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