Over 100 water pipe leaks are emptying the council's reservoirs at an alarming rate.
It comes one week after a couple's rescue from the Tararua Ranges in severe weather.
The pair were out tramping on Monday afternoon when the weather turned.
The woman is set to appear in the Masterton District Court on Wednesday.
"Every paddock was underwater."
The speed limit will be dropped down from 100km/h.
Dramatic photos from the scene show the wreckage.
Emergency services are at the scene and motorists are asked to avoid the area.
The crash occurred on Ponatahi Road, near Carterton at around 8:35am.