Toe Drain System—Barr and Milton Reservoirs, COby L. Stephen Schmidt, (A.M.ASCE), Rocky Mountain Consultants Inc, Englewood, CO, USA,
Abstract: The purpose of this paper is to describe the design and construction of toe drains in difficult soil conditions for two 70 plus year old dams in Colorado using a unique toe drain installation procedure. The dams are sand on sand foundation, thus presenting significant problems for toe drain construction because the drains must be installed in cohesionless material below the water table. Toe drain construction was made practical and economical through employment of a specialized machine. The machine excavates for the drain, installs the filter gravel zone, and installs the drain pipe in one continuous operation while maintaining design line and grade. A unique solution was employed to provide a surface discharge point for two of the drains at an elevation lower than the surrounding ground and water table. A convenient flow measuring device for each drain was designed and constructed.
Subject Headings: Drainage | Construction equipment | Reservoirs | Flow measurement | Construction materials | Drainage systems | Porous media flow | Fluid flow | Infrastructure construction | Soil water | North America | Colorado | United States
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