Imperial Reservoir Imperial Reservoir The Imperial Reservoir is an artificial lake formed by the construction of the Imperial Diversion Dam across the Colorado River in the Lower Colorado River Valley of Imperial County, California, and Yuma County, Arizona. A component of the Imperial National Wildlife Refuge, the reservoir is northeast of Yuma, Arizona. Dry washes are the major watershed feed systems to Imperial Reservoir. The next upstream major watershed feeder is the Bill Williams River from western Arizona. Upstream on the Colorado River, the basic feeder watershed to Imperial Reservoir is the Havasu-Mojave Lakes Watershed, of Lake Havasu. Two dry wash watershed
Imperial College Union (representing all postgraduate students) also became a constituent union. The Silwood Park Union operates largely independently from the overall Union but has no part or full-time sabbatical leadership. Imperial College Union has a large number of student-led clubs, volunteering projects and societies (known as CSPs), with over 400 in total. Funding for CSPs at Imperial College Union is significant, taking up a sizeable portion of the Union's annual subvention provided by Imperial College London, though many clubs supplement this with sponsorship from outside of the Union. CSPs at Imperial College Union are administered by the Clubs, Societies' and Project Board,