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 Program Inputs
Entrance Tank Program Outputs
Entrance Tank AutoCAD Drawing Program
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).
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.
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. Note that the width of the entrance tank is defined to be the same width as a floc channel.