COMPUTER-AIDED DESIGN AT RECONSTRUCTION OF THE RIVER BED OF THE KYRGAY RIVER IN THE KEMEROVO REGION
The research goal is to substantiate the parameters and technology of topography formation in the valley of the Kyrgay River of the Kemerovo Region which would ensure environmentally sustainable and the efficient functioning of the hydrologic system. To achieve this goal, the forms and parameters of technogenic relief of the river valley were substantiated; they had to bypass the landslide formed by stripping operations during quarry development. The basic principles of AutoCAD Civil 3D by the reconstruction of the river valley are described; the reconstruction involves the creation of a newly-designed river bed to prevent flooding of the area. The designed route of the river bed is plotted on the digital terrain model obtained by processing topographic and geodetic information with the standard AutoCAD tools. The designed route of the Kyrgay River bed goes along the landslide border with minimum bends. The total route length makes 854 m. The longitudinal profile along the route axis of the designed riverbed is plotted automatically. A real advantage is a complete dynamic model; when the route position is adjusted in the situation plan, the software automatically recalculates the ground level marks on the longitudinal profile, slope marks of the designed river bed and distance between all distinguished points. The cross-section of canalized bed of the Kyrgay River is taken on the basis of the peak flow with exceedance probability of 1%, which makes 80.59 m<sup>3</sup> s. The width of bottom excavation is 6.4 m; steepness of slope - 1:1.5; water depth in the channel - 1.95 m. Based on the obtained data, the designed surface of the designed river bed route is constructed; the results of the land surface construction may be visualized. The switch to the technology of dynamic three-dimensional design based on the Autocad Civil 3D software optimizes the entire design process, reduces labor and time costs of engineering surveys and creation of high-quality projects.