Assertion: weir's effect | /r/CapableOf | become at higher head pressure
Facets:
value: to increase the discharge
type: PURPOSE
value: on the crest
type: LOCATION
Source sentences:
text: At lower head, the pressure on the ogee crest becomes positive which results into the backwater effect and this backwater effect reduces the discharge while at the higher head pressure on the crest becomes negative causing backwater effect to increase the discharge.