Irrigation
Digging canals from a nearby river or lake into a hex can permanently reshape the land, adding a lasting water feature to the kingdom.
You send excavators to build waterways, canals, or drainage systems to convey water from areas that have natural access to a river or lake. Spend RP as determined by the hex's most inhospitable terrain feature (see the Building on Rough Terrain sidebar on page 519). Then attempt a basic check.
Critical Success The hex gains a river or lake terrain feature (or you change the effects of a previous critical failure at Irrigation in this hex into a failure); work with your GM to determine where these features appear in the hex.
Requirements You control a hex adjacent to a river or lake that itself does not contain a river or lake.