Checking an alternative method for calculating river flow by similar posts

In hydrological practice, the search for secured values of water flow is determined by the lengthening of short series of observations for one or more analogous posts according to standard established graphical or analytical dependencies. An alternative method for calculating runoff is proposed as an additional one to the standard method. If there is a correlation between the cost values of the post and the post-analog, this method allows you to do without intermediate estimated costs, and according to the data of the "expense-security" pairs, to restore the full security curve of a short series of observations.