photo by: Nati Harnik | AP Photo

The Republican River is seen near Guide Rock, Neb., with an irrigation pivot alongside it April 5, 2011. A legal battle between Kansas and Nebraska over use of the river's water has reignited after the U.S. Supreme Court recently decided that Kansas can proceed with a lawsuit against Nebraska over use of the river's water.

photo by: Nati Harnik | AP Photo

An irrigation pivot is used adjacent to the Republican River, unseen just beyond the trees, near Bostwick, Neb., April 5, 2011. Kansas is seeking to force Nebraska to stop irrigating about 500,000 acres in the Republican River basin.

photo by: Nati Harnik | AP Photo

This April 5, 2011, photo shows the Republican River, near Superior, Neb., the point where it flows into Kansas. A legal battle between Kansas and Nebraska over use of the river's water has reignited after the U.S. Supreme Court recently decided that Kansas can proceed with a lawsuit against Nebraska over use of the river's water.

photo by: Nati Harnik | AP Photo

The Republican River is seen near Guide Rock, Neb., with an irrigation pivot alongside it April 5, 2011. A legal battle between Kansas and Nebraska over use of the river's water has reignited after the U.S. Supreme Court recently decided that Kansas can proceed with a lawsuit against Nebraska over use of the river's water. In addition to some $72 million in damages, Kansas is seeking to force Nebraska to stop irrigating about 500,000 acres in the Republican River basin.