PRELIMINARY DESIGN OF THE HYDRAULIC WORKS – DAM IN THE VALE DOS FETOS RIVER Irene Almeida Samora Objective: The main purpose of this extended abstract is to present the design, on a preliminary level, of the hydraulic appurtenant work of an rockfill dam. The chosen location is a section of the Vale dos Fetos river, near the Luso village, and its main characteristics are summarized. The studied hydraulic structures were the spillway, the temporary diversion, the bottom outlet, the ecological discharge outlet and the intake tower. Keywords: spillway, temporary diversion; bottom outlet; intake tower. Topography and Hydrology A hydrological study of the dam watershed was developed to obtain the flood hydrographs with return periods of 20, 5000 and 10000 years. For that purpose, precipitation-runoff models were used, such as the SCS’ HUD model and the rational formula, taking into account the intensity- duration-frequency curve of the nearest meteorological station among those studied by Brandão et al. (2001) and the meteorological data of the nearby climatic stations. The dam’s axis was chosen based on the topographic characteristics of the construction site, with an established NWL at elevation 198. The dam’s body is made of rockfill and both the upstream and the downstream slopes are 1:1.3. Table 1 presents the main topographic and hydrological characteristics of the dam. Table 1 – Main topographic and hydrological characteristics. Location Hydrology Village Luso River basin área 1.44 km 2 Mean annual rainfall 1045.2 mm River Vale dos Fetos river Flood runoff 32.0 m 3 /s Return period 5000 years Dam Reservoir Type Rockfill Reservoir area 39 000 m 2 Height above streambed 27 m Gross capacity 36 x 1000 m 3 Volume of dam body 92 x 1000 m 3 Effective storage 32100 m 3 Crest elevation 200.00 m Normal water level (NWL) 198.00 m Crest length 244.00 m Maximum flood level (MFL) 198.80 m Crest width 6.00 m Minimum operating level 180.80 m
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PRELIMINARY DESIGN OF THE HYDRAULIC WORKS – DAM IN … · The dam’s axis was chosen based on the topographic characteristics of the construction site, with an established NWL
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PRELIMINARY DESIGN OF THE HYDRAULIC WORKS – DAM IN
THE VALE DOS FETOS RIVER
Irene Almeida Samora
Objective: The main purpose of this extended abstract is to present the design, on a
preliminary level, of the hydraulic appurtenant work of an rockfill dam. The chosen location is a
section of the Vale dos Fetos river, near the Luso village, and its main characteristics are
summarized. The studied hydraulic structures were the spillway, the temporary diversion, the
bottom outlet, the ecological discharge outlet and the intake tower.