Level Monitoring

(1) Benefits of Level Monitoring

(2) Monitoring Results Analysis

What is a precise level?

A precise level is fitted with a �parallel plate� to allow fine adjustment of the line of sight. This makes it about 100 times more accurate than a standard engineer�s level, although both are basically a small telescope mounted on a tripod with a mechanism to keep them horizontal. The difference in level between two points is calculated by noting where the line of sight hits a graduated staff held on each point in turn. Each measurement is read to 0.01mm, although cumulative errors reduce the accuracy to about 0.2 mm. As a check the survey always starts and finishes on the same point and the difference is recorded as the �closing error�

What are the advantages of precise Level Monitoring?

Using the most accurate instruments on the market and experienced personnel, precise leveling can reliably measure foundation movements to a fraction of a mm. Graphical presentation against time produces a clear picture of which parts of the building are moving and how much.

• Implicated trees are readily identified
• Misdiagnosis is eliminated
• Limited underpinning schemes can be designed in the knowledge that they stabilising the right parts of the structure.
• GeoServ provides independant data in tabulated and graphical forms (see Monitoring Services) 

Do You Need Level Monitoring?

Possible criteria for level monitoring includes:

• Claims involving oak, willow, poplar or elm
• Claims involving any large trees (> 10 m?)
• Claims involving LA trees
• Claims involving removed trees
• Claims where there is no obvious explanation for the damage
• Claims involving potentially difficult p/hs

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