A culvert, constructed under a pond field, a road, to allow water to pass without flooding.
Culverts in pond fields, payaw, are from 15 cm. to 1 m. square at the opening, made of stone walled sides with flat stones on top. Some culverts are constructed under single pond-field plots, wānit; other large culverts are constructed under a series of fields, in Batad up to 100 m. in length. Water passes just below the base of each stone wall, and there is an opening into the culvert at the wall base. The floor of the culvert can be temporarily built up with stones and mud to allow irrigation into a pond field through the opening. The temporary diversion is constructed in such a way that it will be washed away in a heavy flow of water through the culvert so the field will not be excessively flooded.