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Layer Pits Lake

Tuesday, September 9th, 2014

Land and Water Services Ltd were contracted by the client to eradicate New Zealand Pygmy weed (Crassula) from an exposed mud flat in a lake at Layer-de-la-Haye in Essex. Works were carried out according to best practice with initial tree clearance and containment methods including the installation of a silt screen to prevent any water borne contamination. 

Layer Pits Lake

Using Land and Water’s specialist low ground pressure amphibious excavator and tracked dumpers removal of the material plus a 2m depth of sand from the bar took place. All vegetation and spoil was  buried on site in specifically prepared pits. Transport routes were protected and high levels of house keeping maintained including washing down of vehicles, daily site inspections and decontamination procedures throughout the contract.

Layer Pits Lake

Layer Pits Lake

 

Epping & Brent Vegetation Management

Friday, October 14th, 2011

As part of the Vegetation Management Framework contract held by Land & Water Services, maintenance work was carried out on specified watercourses in both the Epping and Brent areas. Cut is carried out to a regime which takes into account, habitat, sustainability and flood prevention. 

Long Reach Excavators at Epping Brent Vegetation Management - Land & Water Case StudyThere are several aspects to this contract with Land & Water providing; 24 hour Emergency Standby for flood cover on specified water courses and structures, monthly inspection/observation visits on specified water courses and structures, trash screen clearance, minor tree works, hand dredging, flood bund and bank reinforcing and also silt sampling and testing.  The contract also involves the maintenance of a silt trap and flood relief pond which involves the annual clearance of approximately 100 cubic meters of deposited silt from the trap and overspill that has flowed into the lake. 

This work is completed using heavy machinery. A 22 ton Long Reach excavator along with a 9 ton dumper and finally several 8 wheeled haulage wagons for removal from site. The lighter vegetation works are carried out by a small works team using hand held equipment and takes approximately 4 weeks per year, the maintenance visits and subsequent work involves approximately 2 days per month over 12 months and the silt trap and pond works approximately 1 week to complete. 

Wherever possible cleared material is taken for recycling or composting reducing the need for disposal to landfill. 

Epping Brent Veg detail Land & Water Case StudyEpping Brent Veg detail Land & Water Case Study After

 

Dredging Wells Outer Harbour

Tuesday, March 29th, 2011

Wells Harbour was chosen as the base for the survey, crew and work boats supporting the construction and future operation of the new Sheringham Shoal offshore windfarm.

Land & Water Wells Harbour dredging operations

 

Work originally began on constructing the outer harbour late in 2009 to accommodate this new activity in the port. The harbour entrance channel was also deepened to extend the times that small-draft workboats for windfarm workers and crews could enter and leave the harbour, in particular for morning and early evening entrance on neap tides.

Unfortunately by late 2010 it was apparent that the new outer harbour had experienced substantial erosion and re-siltation so Land & Water Services were engaged by Wells Harbour Commissioners to remove this material and further increase the depth of the harbour, depositing the arising material to strengthen the surrounding berms.

Land & Water used an 8 piece Ravestein pontoon with a 15m long reach excavator to carry out the works which was supplemented by 2 further 22m land based long reach excavators and a D6 Dozer spreading the arising material. A total quantity of 25,000m3 of material was removed during this contract.

Wells Harbour dredging operations - Long Reach Excavators 2Wells Harbour dredging operations - Long Reach Excavators

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Learn more about Land & Water’s Dredging capabilities

Rutland Water Habitat Phase II

Monday, April 19th, 2010

The project entailed Land & Water Services being appointed as subcontractor to Carillion to install  two sheet piled walls and place rock armour using a selection of long reach excavators.

Rutland Water Phase II overview Land & Water Case StudyDue to water levels being very low it wasn’t possible to ‘go afloat’ so the rock armour was placed on both berms at the same time creating working platforms so the sheet piles could be installed.  Piling started in November using a Movax piling hammer and was completed in December 2009.  The placing of rock armour continued until late December with piling works commencing in January and being completed in Feb.

Once all piles had been installed excavators then reshaped the stone piling platforms into the finished design.  Floating long reach plant was mobilised to finish off the re-profiling works and also to commence the intake pipeline works. The pipeline was excavated by a 35t long reach excavator on a pontoon complete with a dig system to guarantee the gradient of the pipe being laid was within tolerances.

Once laid a pipeline concrete protection mattress weighing approximately 4.5 ton was placed over the pipe to protect it and provide weight to overcome the problem of positive buoyancy of the pipe when the reservoir levels drop.

Rutland Water Phase II piling - Land & Water Case Study

 

long reach excavator in use at Rutland Water Phase II - Land and Water case study 

Vegetation Management – Environment Agency Canterbury

Monday, November 30th, 2009

The Environment Agency, Canterbury depot requested that Land & Water Services, under the held term framework contract, determine a solution for clearing their various water courses of weed and the bankside margins to promote fast flows and prevent flooding given normal annual rainfall.

Canterbury Vegetation Management - Land & Water Case StudyThe proposed solution was a combination of a 15 tonne long reach hydraulic excavator equipped with a weed cutting bucket to remove  all vegetation in the water course and a tractor mounted side arm flail for the bankside material.

The works were carried out during the summer months and took a total of 34 days  with the excavator and 38 days of flailing which achieved the original specification within the time frame and budget available.

Canterbury vegetation EA - Land & Water Case Study detail Long Reach Excavator

 

 

River Kennet Fish Pass Installation

Tuesday, October 14th, 2008

The River Kennet runs through The Avington Estate in Berkshire, besides forming a stunning historic country estate the river also forms one of the counties most prestigious trout fly fisheries. The river is controlled in numerous sections by control structures hence forming impounded sections within the river lengths.

River Kennet Fish Pass Land & Water Case StudyLand & Water undertook the project working closely with the clients project engineers and consultants to form two natural fish passes. The passes were formed by excavation of channels under live river conditions with extensive controls to prevent silt migration whilst the works were undertaken. Erosion protection to the banks was undertaken with the placement of pre planted coir rolls staked into place with driven chestnut posts.  Native gravels were imported and placed to the bed of fish passes to form riffles, conditions in which the fish and ecology thrive. Other areas of river where large scale erosion had taken place were narrowed again by the installation of pre planted coir rolls which were backfilled with the previously excavated materials from the fish passes. A 20 metre weed rack which provided for further river impoundment was also removed with the deployment of a specialist diving team.

All works were undertaken with Land & Water specialist long reach excavator fleet operated with bio-degradable oils with the ability of being able to site the machine a minimum of 3 metres back from the river bank as part of the clients strict water vole habitat mitigation. Works were undertaken with Land & Water Services as the principal contractor and completed within a tight schedule and to budget.

River Kennet Fish Pass Land & Water Case Study DetailLong Reach Excavators in use at River Kennet Fish Pass - Land & Water Case Study

Revetment works on the River Wye: Chepstow

Friday, April 14th, 2006

Discharging into the Severn Estuary the River Wye has a 13m tidal range and at Chepstow is throttled between town and cliffs.  The rock watershed means that as rainfall quickly runs off the land a dangerous river becomes lethal. When the Environment Agency in Wales found that the upper section of the river bank was collapsing beneath a pontoon and link-span bridge, with no access from the land, they turned to Land & Water for a solution. The riverbank could only be reached for a short while over the highest tides and during limited daylight windows.  A low headroom road bridge just downstream meant that movement on the river could only be during low tides.

River Wye Land & Water Case Study

Land & Water used a 13 tonne long reach excavator with an extension hoe on their modular pontoon system with powerful, shallow draft tugs and hopper barges.

Land & Waters method was to flat away the link span bridge and pontoon before completing the re-grading and placement of protection over the last suitable tide of the season.

River Wye Land & Water Case Study detail Long Reach Excavator at work on River Wye - Land & Water Case Study