Utvärdering av djupdränering och infiltration i innerslänt – väg 126, Torpsbruk: Del 2, kompletterande data

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Klas Hansson

This report contains additional data from the study of moisture, drainage and groundwater along highway 126 near Torpsbruk, Sweden. The following are the main conclusions to be drawn from the experiments with sealed road verge and deep drainage system. Deep Drainage (with the Trammel system): • the installation of a deep drainage system can be recommended in places that have high ground water table and road cut in soil. • an effective method to control groundwater. • lowering the ground water table is very fast. • deep drainage can affect groundwater levels relatively far from the road area. • it reduces the moisture content of the road structure. • it needs to be maintained regularly. Sealed road verge: • no self-evident advantage of the sealed road verge in every case. • it stabilizes the moisture content – peaks of moisture and dry periods are leveled out. • it can prevent water from coming out of the road structure if water for any reason is coming in e.g. through cracks in the coating or penetrating groundwater. On the studied site are 13 groundwater level pipes (manual reading), 7 groundwater level pipes (automatic reading) and 4 pipes with moisture content sensors installed. Previous results are published in VTI Notat 13-2012.

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