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PIPELINE FROM SETTLING BASINS TO FILTERS Settled water is passed <br />through a 24 -inch concrete pipe from the settling basin effluent weir to the <br />filter influent trough. Both the original filters and the outside filters <br />can be served by this line. However, in recent years, a separate influent <br />line has been built to the outside filters. This was done to allow the <br />interior filters to be isolated from the outside ones and thus gain additional <br />plant flexibility. Capacity of the 24 -inch concrete line mentioned exceeds <br />20 MGD when flowing full. <br />RAPID SAND FILTERS As previously mentioned, the original filter house <br />(Figure 9) contained six rapid sand filters. Each of these filters has a <br />sand surface of 280 square feet and has a conservative rating of 0.80 MUD <br />filtering capacity. This capacity could be extended to 1.0 MGD without <br />seriously effecting the final quality of the water but would result in <br />shorter filter runs between backwashing operations. <br />Figure 9 <br />- 33 - <br />