Agenda - 10-07-1991 - Laserfiche WebLink

Browse Search

utility situation in that area, this construction would be an undertaking of considerable difficulty and it could involve causing considerable obstruction of Churton Street traffic. Other advantages to Hillsborough in using the existing sixteen inch line include the greater water carrying capacity in the larger line and less expensive pump capital, operation and maintenance costs. During the meeting between OWASA. Hillsborough and myself. I believe that most of the questions of an engineering nature regarding the feasibility of the proposed water main sale were addressed satisfactorily, at least in a preliminary sense. Representatives for.OWASA did bring up two points regarding the total carrying capacity of the 16 inch main in relation to the ultimate water demand on the main when.that segment of the Hillsborough water system reaches complete build -out. OWASA indicated that a future need might arise for having 2.000.000 gallons per day pumped through the line to OWASA. Hillsborough's future water demands in the area served by the sixteen inch main could conceivably become so great that the pipe might be unable to accommodate the additional OWASA need because insufficient water carrying capacity remained. In a similar vein. OWASA indicated that it might need to use the existing pipeline to convey water from southern Orange or Jordan Lake to the future Mebane - Efland area commercial development. The most likely scenario for routing for a large water line connecting OWASA to the Efland area would be to connect a sixteen inch line running along the northern side of I -85 to the existing 16 inch line in Hillsborough. If OWASA were to sell the segment of the existing line between Davis Road and I -85 to Hillsborough. OWASA would have to construct a parallel segment of water line or use the Hillsborough segment of water line. If OWASA was forced to use a segment of line belonging to Hillsborough and .Hillsborough's water demand in that area had already used all or most of the carrying capacity of the pipe. then OWASA would not be able to convey water toward Efland. With pumps that have sufficient pumping capacity at high head conditions, a sixteen inch pipe could be reasonably expect to carry--four to five million gallons of water per day or perhaps more. Under the same head and residual pressure conditions, a twelve inch pipe will carry slightly less than half the flow carried by sixteen inch pipe. It seems likely that if the water demand for ultimate build out of the Hillsborough system could be satisfied with a twelve inch pipe. then a sixteen inch pipe could meet that demand and an additional two million gallon per day demand by OWASA. The engineering questions raised by OWASA relating to ultimate water demands, pipe carrying capacity, pump selection, residual pressures and head loss. etc., cannot be answered with any degree of certainty without more in depth study by the engineers of Hillsborough and OWASA. V