Optimizing the design of road hydraulic structures for water harvesting
The case of Freweyni ¿ Hawzien ¿ Abraha ¿ We¿Atsbeha road, Tigray, Ethiopia
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For safe disposal of water, roads are provided with hydraulic structures to safely convey the water from catchments. Road hydraulic structures are, however, designed without considering the effect of concentrated water downstream of the cross-drainage structures. This study explores effect of design improvements of road hydraulic structures for water harvesting. The study was conducted with a case study in the Freweyni-Hawzien-Abraha-We-Atsibha road network. Road design improvement scenarios were also developed for different channel characteristics depending on the location of the road drainag...
For safe disposal of water, roads are provided with hydraulic structures to safely convey the water from catchments. Road hydraulic structures are, however, designed without considering the effect of concentrated water downstream of the cross-drainage structures. This study explores effect of design improvements of road hydraulic structures for water harvesting. The study was conducted with a case study in the Freweyni-Hawzien-Abraha-We-Atsibha road network. Road design improvement scenarios were also developed for different channel characteristics depending on the location of the road drainage structures. In this study, HEC- HMS was used to simulate rainfall-runoff processes for the sub-catchments of road drainage structures. Floodplain analysis was done using ArcGIS, HEC-GeoRAS and HEC-RAS. HEC- HMS and HEC-RAS were used also to assess the effect of the design scenarios at selected sites in the case study areas. Runoff was estimated either using the Rational or the SCS curve number method depending on the size of catchment areas.
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