The path we're working on is a sub-soil path and was built several years ago using a digger. Since then with all the heavy use that it gets the path has started to become mobile and this has been made worse by surface water running down the path when it rains.
Although there are numerous drains already in the path we decided that to slow down the erosion process more drains were required.
So earlier on in the year we selected some suitable drain stone and had it flown to site. The picture above shows the work in progress. The piles of stone around the drain is some of what had been flown in but has not been used. The majority, in this instance, is smaller stone used to build the base of the drain. The sides of the drain are built using much larger stone (stones in excess of 2 feet deep are not uncommon) this means if the path below the drain should ever erode it will be a long time before the drain falls out.
Altogether we've put in roughly an extra 12 drains which should mean a lot less water running down the path. Of course all these new drains will have to be maintained regularly throughout the year by both ourselves and the Fix the Fells lengthsmen.