How is the “Horizontal Filter Well” hydraulics system designed?
Combination of horizontal and vertical wells
What are the preferred application for horizontal filter wells?
- low thickness of aquifer
- flow rates greater than 100 l/s
- lower depths -> tunnel-like wells
- greater depths (30-40 m) -> horitontal filter wells
How is the drawdown s in the collection shaft calculated?
Reduction of groundwater level + pressure losses in horizontal filter pipe threads
What is tan(alpha) dependent on?
- the height of the filter pipe h_R
- the thickness of the aquifer H
- the drawdown s
- the thread count n
- the thread length L
- filter pipe diameter incl. desanding area D
What is the operating range of flow rates for vertical filter wells?
20 to 150 m³/h
What is the general depth of vertical filter wells?
Up to 1000 m below ground level
What are the drill hole and filter pipe diameter in rock?
Drill hole diameter: 500 to 600 mm
Filter pipe diameter: 200 to 400 mm
What are the drill hole and filter pipe diameter in loose rock?
Drill hole diameter: 1000 to 1600 mm
Filter pipe diameter: 600 to 1000 mm
What are the flow rates of horizontal filter wells?
Higher flow rates than 20 to 150j m³/h possible
What is the operating depth of horizontal filter wells?
10 to 40 m below ground level
What is the length of filter pipes?
Length of filter pipes: 30 to 40 m
What is the diameter for horizontal filter wells?
ca. 4 m
