Collinstown Business Park,
Old Airport Rd, Cloghran,
Co. Dublin.
Tel: (086) 812 1988/820 9828
Fax: (01) 842 8401
E-mail: donal@lenmargroup.com
Manhole Surveys
Pipe diameters and invert levels are taken for drainage lines and their connection to the adjacent manholes established. Empty ducts are traced from chamber to chamber by rodding with a sonde or flexitrace and their alignment surface marked. Depth can also be established along the alignment of the service.
The contents of each chamber and depth of cover is noted to produce a table of Manhole/Inspection Chamber details. These tables provide essential information during the mapping process. Each cover is tagged and numbered with marker paint on the ground surface and this identity is maintained during surveying and onto the final drawing.