| 摘要 |
PROBLEM TO BE SOLVED: To establish the corresponding relation between the storage quantity and the internal water level to permit the accurate estimation of the other valve from either one of the values of the water storage quantity and internal water level even in a tributary channel, which is a natural river or a sewer or floodway on which civil engineering structural data are unavailable, having a drainage pumping station installed at the lower reaches end. SOLUTION: In a tributary river 101 at high water, a water gate 107 is closed, and a pump 108 is controlled to settle the internal water level at a specified constant value. Since 'the inflow water quantity to the tributary river 101=pump discharge' is satisfied during constant value control, the originally unmeasureable inflow water quantity can be computed. Using this property, specified pump control and internal water level operation are performed, and a water balance equation 'storage quantity variation=inflow water quantity-pump discharge' in the tributary rive 101 led out at this time is solved to compute the storage quantity corresponding to the specified internal water level. This process is repeated to obtain a plurality of corresponding points between the internal water level and storage quantity, and these corresponding points are connected by an interpolation curve to settle a corresponding relational curve between the internal water level and storage quantity. |
