Assertion: weir's construction | /r/MadeOf | necessary
Facets:
value: for structural reasons
type: CAUSE
Source sentences:
text: The construction of the bridge was made necessary for structural reasons; the three main bearing walls and the strong horizontal bar support both the weight of the bridge and the pressure created by the damming of the water in the canal (the weir is also referred to as a bridge weir as a result).