Flow Deficit On The High Setif Plateaus. Coutagne And Turc Methods

The flow deficit (D) represents an hydrobioclimatic characteristic. It is evaluated over a period of 34 years. The principle is based on models developed by Coutagne and Turc. The mean annual results indicate that cumulative rainfall (P) is 386.4 mm determining a flow deficit of 334.6 mm. Coutagne's equation reveals that D is 341.2 mm. Turc model takes an average relative difference of 8%. However, the value of P = 369.6mm represents the threshold below which the year is considered dry. Hydrological water balance generates 48.0mm of water flow.