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Alpsray, PAG III
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Extension of a Plant for Lowering Groundwater
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On a playground area in the village Alpsray two collector wells were installed. The first collector well has two laterals the second has three laterals.
In order to keep privat ground untouched it was necessary to build two caissons instead of a single one. In this way all laterals could be installed under public property.
These collector wells extended an established ground water lowering system. The surrounding properties are keept dry and save against rising ground water due to permanent operation.
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Design of Collector Wells:
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depth of caissons: ca 14 m
inner diameter of caissons: 2,80 m
number of laterals: 5
length of laterals: 36,50 m up to 64 m
drilling diameter: 464 mm
dimension of screens: 250 mm and 290 mm
typ of screens: bridge slotted screen, made of stainles steel, surrounded by an artificially flushed in gravel pack
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