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Sara, Kevin, David meet with Raul to discuss the sedimentation tank plan, and what help he needs. Raul is working on the design over the weekend and design review will shortly follow in the next week.
The tank was drained again to prepare and dry the tank for caulking. Given the amount of time needed for the tank to dry for caulking (about a week) it was decided to add additional sand to the cracks around the bottom panel in the third section and in the first section but just in the very first section by the inlet. It was hoped that enough headloss could be created to decrease the severity of the by pass. Upon observation it seemed to at least help the issue a little bit. On Monday if the by pass still seems to be an issue the tank will be drained at and caulked before further tests are run.
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Entire group met at plant along with Leah to review plant data from the weekend and discuss options for the Automated flow device. Also reviewed options for insulation and lighting on McMaster, and came up with potential options. Sara also described testing procedure to the rest of the group and Rebecca cleaned the turbiditymeters. Plant results were inconsistent, and the turbidity in the flocculator continues to be larger then the inflow water. Heavy condensation was noticed on the tubes connecting the tube settlers to the turbiditymeters, indicating a significant temperature difference between the water and the air. Pictures were taken of various components of the plant, and have been put on the Wiki.
Kevin brought a clear pipe and placed it down the side of the tank where upwelling is suspected to be a problem. Adjusting the pipe, the water in the pipe would rise up to two centimeters above the tank water level. Based on Bernoulli equations this shows that there is a significant velocity, and thus quantity of water bypassing flocculation. We concluded that this does not effect the turbiditimeters because they are placed upstream of the upwelling (the non-flocculated water is not going into the turbiditimeters), however upwelling does effect the flow rate. We must determine if this is significant.