Hydrostatic  elevation measuring

applications

 

• elevation of pipes
• slope
• covering of culvert pipes
• settlement of constructions

measuring principle
A constant hydrostatic pressure is supplied by a water-filled level box (Niveaugefäß) via a small water pipe towards a pressure cell. The hydrostatic pressure is proportional to the elevation difference between the outside water level and the measuring sensor inside the pipe. The relation provides the geodetic elevation difference, msl altitude can be calculated.

procedure
The sensor will be placed in the pipe by means of

 

• TV-Vehicle (right image)
• tension rope
• flexible fiber stick (up to 250 m)

The measuring is conducted either at local points (standard distance 0,5-2m)
or
over a certain time-period at one point (level gage)

combination with other measurings (temperature) is possible

evaluation
presentation of measuring results as elevation profiles

example
culvert monitoring at Rethem/Aller (D)
Avacon gas pipe, DN 160
trenchless construction
control of covering
 

diagram: msl altitude vs. distance
 

example
monitoring of a household inlet
PWD  Braunscheig (D)
flow problems
result: 2 cm hang down before inlet

capacity
All kind of pipes, starting diameter 25 mm (1´´),
range: up to 400 m Länge
max. elevation difference: 50 m

accuracy
depending on operation modus: up to +-5mm

costs
depending on operation modus and device:  5-10 $/m

references
landfills: Detmold, Paderborn, Düren, Vechta, Bad Ems, Jever, Varel, Dortmund, Tauberbischofsheim, Cloppenburg, Groß-Gerau, Celle, Rotenburg/Wümme, Leppe, Gotha, Zwickau, LK Kassel, Troyes (F), Leuuwarden (NL)
commercial: VW, BKB, Bayer, Avacon, Post, Harbor Authority Hamburg
PWD: Hannover, Braunschweig, Hamburg, Lohr
construction: Ijsselmeer dyke improvement (Rijkswaterstat, NL) for consolidation monitoring