Yea, that is it in a nutshell amystery
A 7m high wall of mud, ash and shit that has the power to remove (or severely damage) a rail bridge on the main trunk line. What is the cost to rebuild / repair that?
So why not start the siphoning process now? If the pipes last a couple of months before they are dissolved then just replace them and keep replacing them until the there is a more permanent solution to the problem with the ash dam.
Surely the cost to replace the pipes a few times would be cheaper than rebuilding / repairing a main transport link.
Mutter mutter.. dam false economy.
