Specifics of geodetic works as part of acceptance tests of water drainage systems on bridges

Introduction. Effective management of surface runoff from urbanized areas is a key task in modern construction, directly impacting the safety, functionality, and longevity of structures. Traditional solutions and calculations that permit the flooding of a catchment area up to the height of a curbstone are unacceptable for use on bridges. Incorrect calculation of drainage parameters can lead to aquaplaning, saturation of structural elements, and their subsequent destruction, which necessitates the improvement of existing methodologies. The primary method used in Ukraine for calculating stormwater runoff from a catchment basin is the limiting intensities method, described in [4]. Globally, Manning’s formula [1-3, 11] is widely used and applied. A separate, yet critically important, and often-ignored aspect is the relationship between theoretically justified minimum slopes and the accuracy of their practical implementation. When designing and constructing bridge structures, the determination and provision of minimum longitudinal slopes required for effective drainage depend directly on the accuracy of measuring equipment (levels, total stations) and the qualifications of the workers. Small slopes can turn out to be less than the permissible measurement error, making their practical realization impossible and leading to the formation of stagnant zones. Thus, the analysis of the influence of slopes must be integrated with an assessment of the practical feasibility of the specified parameters.