Entrance Tank Design Program
The purpose of this program is to design the dimensions of the entrance tank based on the flow rate of the plant and the flow rate required for rapid mixing. The Entrance Tank is constructed as a separate channel before the flocculator, and includes a grit chamber to help with aeration issues.
Entrance Tank Design Program Algorithm
Entrance Tank Program Inputs
Entrance Tank Program Outputs
Entrance Tank AutoCAD Drawing Program
Algorithm
The entrance tank is designed to be an extra channel before the flocculator, and the same size as a single floc channel. This program therefore calls variables defined in the Flocculation design program.
The area of the entrance tank is calculated based on the flow rate through the plant and the required up-velocity through the entrance tank (found in Design Assumptions).
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The depth of the entrance tank is designed to have the same depth as the floc tank, plus an additional depth to account for the headloss through the linear flow orifice meter.
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The length of the entrance tank (L.Et) includes the length of the grit chamber, and equals the length of the sedimentation tank. The width of the entrance tank (W.Et) equals the length of the floc channel.
Grit Chamber
The grit chamber is contained within the entrance tank. A concrete barrier will be built to give the grit chamber a length that satisfies the upward velocity constraint previously mentioned.
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