Hydrological studies in Syria- in general- based on classical methods to derive catchment areas of road culverts or estimating the design storm for these catchments. Such operations have a significant degree of complexity, effort and time costing, up
to
implementing clear concept about streams crossing the road and deriving the catchments boundaries to estimate the designing storm discharge according to road classification and passing facility type preventing road inundation or demolition.
In this study the GIS technique was used to derive catchments for all outlets on this road and the morphological properties were estimated. The developed hydrological model for studied road allows designers to evaluate more accurate solutions in such engineering cases like determiningthe best locations for culverts on roads, estimating design storm and design discharge for those outlets and all other engineering characteristics “designing
parameters” such as longitudinal slope, span, area, number of openings. as it allows the development of various economic solutions in order to choose the best one from both
engineering and economic view points, according to road classification and storm probability.
