This article or the following section is not adequately provided with supporting documents ( e.g. individual evidence ). Information without sufficient evidence could be removed soon. Please help Wikipedia by researching the information and including good evidence.
The translation (in rivers ) describes the movement of water or a wave in the water bed when there is no backflow from below (free receiving water ). The flow rate is calculated using empirical formulas. The runoff in sewage lows or other rivers with backwater from below can be simulated with an iterative lake retention method, in which runoff is also possible against the normal drainage direction.
