HYPOTHESIS OF RESISTANCE FORCE IN EQUALITY BY SEN-VENAN
Resistance force is a reaction to action of component of gravity force causing movement of river flow. If the last changes in time it needs some time for forming suitable resistance force. Therefore in the member of equality describing resistance forces it must be speed not for the present moment but for some previous moment of time. The author treats the theses given in the work as debatable and hopes for their discussion among specialists.