抄録
In the conventional discharge rating method using HQ-curve, one approximate line is drawn using least squares method to express the relation between measured water-level H and discharge Q even though this relation does not show one-to-one correspondence at flood time, and there is a possibility that the Q rated by the HQ-curve would have an error against the true Q. In this study, the discharge rating method using HK-curve is suggested instead of conventional HQ-curve method. K means Conveyance. As a result of 2-dimensional numerical calculation, it is shown that the relation between H and K can be expressed by one approximate line because the relation shows one-to-one correspondence, and the Q rated by this method can express the true Q accurately.
