AMES, Iowa — Ames officials implored residents Friday to do a better job of conserving water after historic flooding caused pipes to break and left the college town of 55,000 without drinking water. John Dunn, the water and pollution control director in the central Iowa city, said people must adopt "temporary lifestyle changes." "Water used for any purpose other than essential health and sanitation purposes is hampering our community-wide recovery and extending the amount of time until water is available for drinking," Dunn said.