Collaborative Effort to Conserve 1.6 million acre-feet of Water to Safeguard the River System. LAS VEGAS, NV – In a historic effort to protect the Colorado River Basin, the Impe …Collaborative Effort to Conserve 1.6 million acre-feet of Water to Safeguard the River System. LAS VEGAS, NV – In a historic effort to protect the Colorado River Basin, the Impe …