Environmental work, Dams, Reservoirs and Rivers

• Excavation of foundations, trenches footpaths, etc
• Dam Inspection & remedial work
• Fish Habitat Improvement work
• Shore Protection
• Weirs and River Work

Shore Protection work is undertaken wherever ground is being eroded from boat wash, flooding, waves etc. and consists of rip rap type pitched stones laid to protect river banks, lake shores etc. A geotextile layer is generally placed behind the stones to prevent the fines being washed out.
LMC have undertaken investigations into a masonry wall dam with an earth filled embankment which is leaking and carried out remedial work to try and seal the leak. We have also carried out work building a channel suitable for fish and other habitat improvements.

Construction of masonry wall at bottom of spillway		Construction of fishpass as a bypass to the spillway

This section of work includes the following:- Excavation of foundations, trenches footpaths, etc Dam Inspection & remedial work Fish Habitat Improvement work Shore Protection Weirs and River Work Shore Protection work is undertaken wherever ground is being eroded from boat wash, flooding, waves etc. and consists of rip rap type pitched stones laid to protect river banks, lake shores etc. A geotextile layer is generally placed behind the stones to prevent the fines being washed out. LMC have also carried out work building a channel suitable for fish and other habitat improvements. New galvanised steel sluice gate and walkway installed on take off stream at Langdale Repaired sluice gate at historic watermill in Heversham using greenheart 6*6” timber for longevity 5t excavator working on Foulshaw moss on drainage project on behalf of Cumbria Wildlife Plastic pile dam inserted in field ditch to control flooding as part of Natural England/DEFRA scheme Job Profile – Yew Tree tarn LMC were contracted by National Trust to investigate the leakage of Yew Tree Tarn Dam. A v-notch had been installed to measure the extent of the leak but was found inadequate to measure the volume actually leaking. LMC carried out a Site investigation, installed a Flow Measuring device and carried out a diving survey. The dam was found to contain no clay core but was relying on the masonry wall. The mortar of which was in a poor condition particularly around the base of the wall and around the penstock, and was leaking at about 100m3/hr. LMC then proposed a remedial repair and once NT had funding carried out the work in Summer ‘04. The work consisted of the following :- installation of temporary inflatable bladder Install grout bags along base of dam Install concrete seal to base of dam Install new penstock Seal up spillway Re-furbish fish pass Re-instate small dam wall & V-notch The leak although not entirely sealed was reduced to about 10% of the original volume.