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The actual formated word version of the paper is available here, it is formatted after the papers in Water Research
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The Sutro weir shape is dictated by a series of equations. Approximating the weir was achieved through a computer program in matlab that simultaneously solve the equations and designs a template for hole location and quantity on the riser pipe. The program requires input of maximum flow rate through the water treatment plant and then through iteration selects the largest drill bit size that is able to theoretically mimic the sutro weir with 10% accuracy. The large holes size is beneficial because obstructions are common in untreated water and large holes are less likely to clog. A clogged hole would produce an exaggerated water height and over estimate the flow rate. A riser pipe and entrance tank were designed for implementation in a pilot plant with a maximum flow rate of 120 L/min. The riser pipe was designed for a maximum flow rate of 125 L/min to allow for spikes in flow rate. The riser pipe is made out of three inch white PVC pipe with a consistent hole diameter of three eighths inches. Holes in the riser pipe were spaced over 20 cm and every centimeter was evaluated for necessary holes. The water from the plant flows into the entrance tank, a five gallon bucket, and through the riser pipe into the flocculation tank. In-line with the water inflow pipe a flow meter, siemens model SITRANS F M MAG 3100, is installed. The device provides flow measurements in GPM with an
accuracy of +/-0.25% of flow rate.
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