River Jadar is modeled from the bridge in Osecina to cross section 1650 m upstream. It was divided in 15 crossections. As flow is subcritical, critical depth in the most dounstream cross section is assumed as boundary condition. The discharge was Q=147 m3/s.

The riverhead in control section was analyzed due to uncertainty of input Manning roughness values of main channel and inundation areas. Due to pictures from the field, the roughness coefficients were estimated as an uncertain values. Since in the main channel we have gravel on the river bed, normal distribution with parameters N(0.04,0.005^{2}), and for the inundations, covered with crops and locally the bushes and trees, normal distribution with parameters N(0.08,0.005^{2}) was chosen.