BONANZA SEASON 3 – Gift of Water
A drought has ravaged the flat lands and Hoss stops to water at the Ganther farm where Jason Ganther is attempting to dig a well and get to water which he believes is just a few further feet down. Hoss decides to help him and they begin drilling for water. Meanwhile ranchers in the high country have started up a vigilante group to keep families from leaving the flat lands and settling in the high country where water is plentiful. Disgusted by the vigilantes the entire Cartwright family soon begins helping the Ganthers. Tensions mount between the two groups as the Cartwrights race against time to find the water before violence erupts.
Yvonne Craig in The Good Guys (1969) episode - Communications Gap