Abstract
The objective of this research was to determine the probability of road overtopping occurrence for a road culvert caused by surface runoff from the upstream catchment. A hydrological–hydraulic model was used for the development of an algorithm for road culvert maintenance based on the overtopping occurrence probability (CMOOP algorithm) for small mountain catchments. The hydrological model defines the regression dependence between the runoff hydrograph peak values and the probability of occurrences, whereas the hydraulic model calculates the culvert flow capacity by including in the calculation the level of sediment that culvert is filled with. The relationship between occurrences of overtopping and peak runoff value was defined using the runoff hydrograph transformation model in the accumulation on the upstream side of the road. In addition to the calculation of overtopping occurrence probability for the existing culvert condition, the CMOOP algorithm was used to analyze the impact of rehabilitation and reconstruction works from the perspective of legally based safety criterion for road overtopping occurrence probability (SCROOP). The CMOOP algorithm was appled to 67 concrete culverts located in a mountain road section in the Republic of Serbia. The results show that the application of rehabilitation works on selected culverts will increase the percentage of culverts that satisfy SCROOP from 49.25% to 89.55%, which confirms that the accumulated stone sediment is the main reason for the SCROOP unfulfillment.
Highlights
Road culverts are specific engineering structures that, in addition to their primary role of conveying surface water under the road, have several functions such as providing passage for people and vehicles, or safe passage of wild animals under the road [1]
The basic hypothesis formulated the objective of this research, which was the development of a practically applicable algorithm for road culvert maintenance based on the probability of road overtopping occurrence (CMOOP algorithm) for small mountain catchments, which adds to the existing research in this field as follows:
The application of the CMOOP algorithm for all culverts on a section of the road enables a comparative analysis of the obtained results, based on which general conclusions can be given on the probability of road overtopping occurrence on the analyzed road section
Summary
Road culverts are specific engineering structures that, in addition to their primary role of conveying surface water under the road, have several functions such as providing passage for people and vehicles, or safe passage of wild animals under the road [1]. These secondary functions of culverts can sometimes be of such importance that their size is defined to meet these conditions [2]. In contrast to road culvert design, the maintenance of the existing road culverts has been much less researched.
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