Loosely based on the real-life escapades of Michael H. Kenyon; who for about a decade committed armed robberies on female victims, who he would then sexually assault by forcing them to take enemas. He was also the subject of the Frank Zappa song "The Illinois Enema Bandit", available on the "Zappa in New York" album.
Shot in four days.
Although the theatrical posters claim the film is a Gerard Damiano production, according to director Shaun Costello Damiano had nothing to do with it--the producers put his name on the posters hoping to cash in on Damiano's reputation and draw more people into the theaters.
According to Shaun Costello, the original cut of Water Power in 1977 was 71 minutes. After the title did poorly, Star Distributors re-edited the title two years later changing the run time to 86 minutes.