1 TECHNICAL REPORT STOJICKA RIVERThe main purpose of this technical design is the reduction of bed load sediment in the channel by means of check dams, clearing of a total of 145m upstream and 34 m downstream reach of the check dam in the Stojicka river bed, and profiling in a way that will allow the safe evacuation of flood waters through a village in the zone of intersection with the main road.

1.1 Description of planned works for site clearance of the Stojicka RiverThe clearing and profiling of the Stojicka River bed at the downstream reach is restricted by the local road crossing, as well as land use along the banks (privately owned land). The radius of river alignment curves must be appropriately selected in such a way that, along with other hydraulic and morphologic parameters, enables safe discharge of flood water and sediment. Considering these conditions and restrictions, the planned river alignment follows the existing alignment as close as possible. Table 5 shows the geodetic elements of the planned river alignment. The layout is shown in Appendix 2.1.

The designed solution includes the construction of a trapezoidal cross section large enough to carry the design flood Q1% = 88.9 m3/s. Hydraulic calculation is also made for the 50-year discharge Q2% = 69.6 m3/s.On the section from km 0+005.00 to km 0+038.80 and on the section from km 0+050.00 to km 0+195.00, the cross section is trapezoidal, with the bottom width of 6m, side slope of 1:1 and total depth of 2.8m.

Along the whole section is adopted longitudinal decline of 1.0%, which largely follows the natural decline in the pan.

The inlet structure is designed at the upstream end of the regulated channel (km 0+195.00), as a consolidation sill 0.5m wide. The outlet structure (km 0+005.00) is designed also as the inlet structure for the downstream reach, to be made out of concrete.

1.2 Description of planned works on Stojicka RiversCheck dam is planned in bad of the Stojicka River, a trapezoidal weir wide enough for 100-year discharge - Q1% = 88.9 m3/s ( XY: 7413619.638, 4879561.892)

Check dam on Stojicka River is designed to be made out of concrete with characteristic structural elements (sill and apron), 0.5m high. The front downstream slope is 5:1. The weir is trapezoidal, 15.0m wide and 1.8m high. The foundation is 1.00m deep, 1.0m wide, while the dam is 0.80m wide at the foundation. The apron is 5.50m long, secured with a sill 11.0m wide. Downstream of the sill, stone riprap is placed for a total length of 4m. The layout and cross sections of the check dam are shown in Appendix 5.