摘要(英) |
Water supply construction should build a long-term plan,as the construction demand a enormous cost so that Water Supply Department should plan the water distribution pipeline together with water distribution tanks etc. in advance for fulfilling the network planned water supply rate. If only pipeline erection is being processed in the network, then the design of maximum hourly should be base on water supply rate; if water distribution tank is additionally erected for adjusting the water supply rate, we should simultaneously consider the relationship of the pipeline and water distribution tanks of different water supplying durations of everyday.
Since the network planning is very complicated, generally, the flow rate and pipe diameter etc of each pipeline within the network should be first assumed in accordance with the statistical data or planned water supply rate by the expert or highly experienced personnel, then by applying the conservation principle of the flow rate and capacity etc to calculate the differed value of the assumption. Repeatedly adjusting flow rate, pipe diameter, water pressure, until up to within the allowable error. Then, process further budgeting the cost necessary for detailed designing and calculation. In this research, mathematical planning method is applied by taking the smallest construction expense as the target function. The applying hydraulic theory and water supply work specifications should separately be built as two different mathematic modes for applying to the standard pipe diameter of the selected pipeline and the arranged water distribution tank location as the optimization scheme policy.
The example of this research is gravity distribution network. Water current can reach any part of the network with proper pressure and flow speed for fulfilling the demand of the water utilizing customers within the maximum water utilization period. And to probe the reasons such as pipe diameter, water pressure and flow speed that may affect the smallest construction expense for providing reference to the decision makers or designer in determining whether or not pipeline arrangement and water distribution tank are required. |
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