11141985 Special Meeting - Laserfiche WebLink

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Dr. Kent Butler October 21, 1985 Page 4 substanti al growth begins to occur in this plane east of IH 35, probably sometime after 1995, it may be desirable to substitute elevated storage east of the highway for a portion of the storage proposed west of Post Road. Such storage would likely be somewhat more costly, but woul d increase the reliability of service and the ability to fight a major fire. Reliability of the system will also be greatly enhanced by the connection of the proposed system to the City of San Marcos system. Such a connection would provide an additional source of water in the event that one or more wells becomes inoperable, and provides access to stored reserves from an alternate direction in the event of a broken transmission main or a fire requiring water in excess of the regi ona 1 systeml s capaci ty. The Northeast Pressure Plane will require its own ground and elevated storage facil Hies. Since the water feeding this plane is already at a considerable pressure, it is recommended that a standpipe be utilized to take maximum advantage of the available head, thereby reducing the pumping costs. According to the growth projections, a 2.0 MG standpipe would be adequate through the year 2005. However, due to the substantial cost of this facility, it is recommended that a 125,000 gallon temporary standpipe be installed initially, to be replaced by the permanent faci 1 ity within the first five years. Also recommended is a 0.4 MG elevated tank, with an overflow elevation of about 815 feet. This should be adequate through 1995; a second tank similar to the first would allow for continued growth through 2005. As an option, a single 0.8 MG tank could be built initially to reduce the ultimate number of tanks. PUMPING It is normally recommended that approximately 80% of the maximum hour demands be supplied by pumping. However, for the Lower Pressure Plane, all of the proposed storage is elevated, making pumping unnecessary. For the other pressure planes, the fo 11 owi ng pumping capacities are recommended and should be located adjacent to the ground storage tanks for the Upper Pressure Plane, and adjacent to the standpipe for the Northeast Pressure Plane. The initial pump stations should be designed to pump from either the temporary or permanent storage tanks. Recommended Firm Pumping Capacity (GPM) Planning Year: 1990 1995 2005 - - - Upper Pressure Plane: 1200 2700 6300 Northeast Pressure Plane: 1400 4000 6700 TRANSMISSION LINES The recommended pipelines are as shown in Figures 2,3 and 4, for the years 1990, 1995 and 2005, respectively. The lines were located along