Abstract: The lack of data confidentiality and sharing mechanism leads to the low accuracy of road terrain data used by urban water utilities for rainfall-runoff simulation, which reduces the prediction and defense of accuracy of urban waterlogging spatial distribution. However, the elevation information of the drainage line point data owned by the city water department can reflect the road fluctuation. In this paper, firstly, a high precision road surface model is obtained based on the data of drainage pipeline points and road design curvature data. In this way, road surface feature points are obtained by interpolation, and then road surface model is obtained by pipeline points and road surface feature points. Finally, The feasibility of the method is verified by the data of drainage pipeline points and road sideline in Wuhan.

Key words: road design curvature, drainage pipeline points, urban roads, elevation interpolation, DEM