runnel
To create channels for directing the flow of liquid.
Not all saltmarshes are suited to habitat modification, but where they are, runnelling provides long-term and cost-effective control with minor non-target impacts.
Where it comes from
From Middle English runel, rennel, rinel, from Old English rynel (“that which runs; runner; stream”), from Proto-Germanic *runilaz, equivalent to run + -el. Cognate with Scots rinel, rinnal (“stream; runnel”), Swedish rännel (“runner; runnel”).
Adapted from the Wiktionary entry runnel (CC BY-SA 4.0).