Saturday, November 28 was held at the premises of the Cooperative Poggio dei Pini, 22 October with a meeting of its members, to which were invited all non-members esideravano discuss the contents of the intervention plan developed by Hydrodata on behalf of the river basin in Sardinia.
participation, both numerically in terms of content of the interventions, has been very satisfactory.
The meeting was opened with an introductory statement of operations under the Plan, made by Antonio Sau Lai and Rita, which was followed by comments and suggestions of the defendants.
The following is a summary of the highlights of the description of the Plan of Action and the comments that were made in this regard.
The company was asked to conduct the study is well qualified to do this for background and for the structure that is attached. This company has developed simulation models movement of surface water among the most advanced currently in use in Europe.
The mandate received by the Company Hydrodata is to build a studio in stages, progressively more detailed, setting out the actions to be taken, with two specific objectives:
-security communities living in the basin
- protecting the natural environment.
The study is limited to the basin of the Rio San Girolamo, where there have been more critical during the flood of October 2008.
The Plan of Action has taken an approach of Hydrodata methodology that has been codified in a previous work it commissioned: the study of river belts of Sardinia. The main feature of this methodology is the assumption of a specific parameter on which to gauge the magnitude of the efforts to design: a return period of 200 years of the estimated range to the various sections of the Rio San Gerolamo, calculated on the basis of historical data precipitation (without given in October 2008, which will be added later). This return time is also a rule in the design of road crossings of watercourses.
The study, which reports the results of the first phase of study and has a character First of all, he made a reconstruction, to the various sections of the basin, which of course should be effectively drained: the most significant are 410 m3 / s to the section of concrete sleepers Poggio (as observed) and 670 m3 / s at the mouth of Rio S . Jerome (as calculated).
The capacities calculated for return periods to 200 years under the same sections, respectively, 100 m3 / s and about 200 m3 / s.
The river was divided into 10 sections that were analyzed individually to determine the necessary interventions.
SG01 Mountain Section - No action planned.
SG02 Chapel St. Jerome - Rebuilding the bridge, (1 million euro), with the addition of two beams of 33 m in total. Removing periodic accumulated debris at the bridge. Bank protection (69 m) cliff clogged (180,000 €) flush with the ground level. We provide insight on the latter (stabilized with cement stone, earth and establishment of vegetation with particular root development) that now tend to replace the gabions filled with stones in the practices of environmental engineering of water courses.
SG03 Hydrocontrol - Rebuilding the bridge (2.55 Meuro) three beams to 70 m in total. Defense in Bridge boulders 45 m (120,000 euro). Defence building blocks to protect erosion Hydrocontrol 338 m (800,000 euro). The latter measure will not protect the building from the water as it will be flooded anyway related to flow back to time TR200 years.
SG04 Pools Poggio - Moving 170 m upstream bridge near the pools (3.75 Meuro) 4 beams to 110 m wide. Using the road 24 (road Poggio schools) for access to the bridge. Moving Hydrocontrol road on the hill to the west. Removal of the crossing and the existing road. Bank protection blocks for 936 m in total on the main entrance and in the right bank tributaries (2.33 MEUR). Debris removal in the river bed (disalveo) 1 Meuro. Costs for modifications and adjustments to the road network not covered.
SG05-06 Lakes Poggio - Excavation (including some in the rock) and defense of a diversion channel which excludes the lake, sized for Tr200anni (2.76 MEUR). Some tributaries in right continue to flow into the lake. Protection of concrete (212 m) road Pizzeria La Terrazza. Removing the bridge below the dam. Demolition small lake dam (cost?). Removing debris from the small lake (€ 408,000).
SG07 Sports Poggio - bank protection from erosion gym (360,000 euro).
SG08 sports facilities in Rio S. Jerome - Relocation buildings at risk (the football field and locker room buildings for agricultural use).
SG09 Settlement Urban Rio S. Jerome - bank protection erosion control plan to wire the country (in gabions and boulders blocked) on any channel up to the bridge on 195 (1121 m by 3.14 MEUR). The width of the channel narrows dramatically for the entire journey within the town. In the right riverside of river dikes and walls of 2 m height above ground level surrounding the three sides of a perfect rectangle, west, north and east, half of the subdivision near the river (971 m to 2.34 Meuro) . In the left of the river banks of 2-2.5 m above ground level around (always on three sides) the houses located near the entrance from Poggio dei Pini. The space between the embankments of the river is very narrow. Run on some banks access roads. Realizzazione viadotto (240 m) sulla 195 e limitato ampliamento del ponte presso la scuola materna per complessivi 7,7 Meuro. Briglie e platee antierosione sul corso d'acqua (ca 763.000 euro). Escavazione detriti in alveo (144.000 euro). Demolizione ponti. Delocalizzazione scuola materna.
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