| 摘要 |
<p>PURPOSE:To estimate the flow rate of rain water highly accurately and to make it possible to drain the rain water by using the optimum number of pumps in pump facilities and the like. CONSTITUTION:The state of the amount of rainfall in a rain region (a) is received with radar rain gages 11 and 12. Then, the values are sent into a mesh rainfall-amount- data converting means 13. The rainfall data of the distribution of the mesh rainfall amount is prepared. A rainfall estimating means 4 estimates the rainfall in an object drainage basin (b) for several hours to come based on the prepared rainfall data and the past historical rainfall data. An inflow analyzing means 15 computes the flow rate at the most downstream point of the object drainage basin by using the estimated rainfall data. The computed and estimated flow rate is sent into an inflow-amount correcting means 17, wherein the estimated flow rate is compared with the measured flow rate of a sewage-main line sensor 16 provided at the upstream end of the sewage main line (c). Thus, the error in the estimated flow rate is corrected. Then, the sensor providing point is made to be the upstream end, and the position of the water level gage of a process inflow culvert is made to be the downstream end. The flowing amount is estimated by using an unsteady-flow computing expression in the section between the upstream and downstream ends.</p> |
