The El Purgatorio reservoir will receive around 1,400 l/s of water from the Verde river, an additional 800 l/s from the nearby El Salto dam and a further 3,000l/s from the El Zapotillo dam, which is currently under construction.
 

The reservoir works, 60% of which will be paid for by federal government and 40% by state government, will consist of building a 30 m roller-compacted concrete diversion dam, pumping stations, a regulation tank, access roads, pipelines and a tunnel.
 

A tender for the reservoir's construction will be launched towards the end of the first quarter in 2010 after technical feasibility studies are completed.
 

State water and sewerage utility Siapa is already in possession of the land where the reservoir will be built, which is expected to speed up the construction process which is scheduled for completion in 2012.