GRAND CANYON NATIONAL PARK, Ariz. (AP) — Grand Canyon National Park is implementing more stringent water use restrictions and conservation measures due to a series of breaks in the pipeline that supplies the South Rim. Park officials say the park will remain in conservation mode until water in storage tanks reaches sustainable levels. Under the latest restrictions announced Saturday, the RV dump-fill station and laundry and showers for South Rim campers are closed, and sinks in public and employee restrooms are turned off.