Report on Substantial Completion achieved in late September 2015
This is the footpath known locally as The Three Fields path which leads from the gate at the top of Quarry Road, past the Community Council viewfinder. The path adjacent to the Pond floods at certain times following prolonged heavy rain.
Anecdotal evidence suggests that the flooding started after trees were planted alongside the route of the path some 12 years ago. Investigations undertaken by local volunteers subsequent to the tree planting to ascertain the reason for the flooding had discovered that a fence straining post had been driven through the existing fireclay ten-inch diameter pipe at a point approximately half way between the gate at the top of Quarry Road and the pond.
Local volunteer Roddy Ross was involved in this investigation, and has been central to the project recently substantially completed.
In 2013 a survey was undertaken along the route from the gate to the pond by Keith Henry and Roddy Ross to determine the relative ground levels along the footpath.
This showed that the gradient along the footpath was quite steep in drainage terms. It was assumed that the old pipe would follow this gradient.
A scheme to utilise the old pipe to drain the flood water was developed by Keith Henry and approved by the Cambusbaron Community Council. Funds were raised from The Community Pride Fund (£1,500) and from Paths for All (£1,500) based on an estimate from a local source for the hire of suitable plant for a specified period, considered to give sufficient time for the task.
Excavation at the carefully researched location of the fence post damage to the pipe, revealed the old damaged pipe. A new chamber was constructed at this location on the old pipe, and another at a point close to the pond, allowing for pressure jetting between the two if this is needed.
Due to the proven difference in levels, the pond should drain through the old pipe and overflow onto the ground at the lower chamber. It was not practical to locate the blockage which evidently exists downstream of the lower chamber due to the growth of tree planting, and obstructions such as concrete foundation structures from the old quarry.
Overflow water will drain down he footpath as it does naturally at present, into the large "sump" or hollow to the left of the gate, looking away from Quarry Road. The drainage ditches at the side of the tarmac surfaced path have been improved to facilitate this.
The plant was provided and the chambers constructed by Gardner Plant of Bridge of Allan.
Several photos are attached with this Report illustrating the flooded path, which reached a maximum recorded depth of 1.2metres at the pond edge, and the completed works.
Keith Henry, CEng.
12th October 2015