DischargeKeeperApp (DKApp)

The DischargeKeeper App (DKApp) can measure the discharge in rivers and channels in seconds, no need of ground control points neither cross section. The only information needed is the river width and the water depth, with this values and the recorded video, the DKApp delivers an approximate value of the discharge. If accurate measurements are needed, the data recorded with the DKApp can be reprocessed on the DischargeWeb

HERE you can go the manual