Renewable water is a source that is continuously renewed within reasonable time spans by the hydrological cycle. An example of this would be annual snowmelt from the mountains or rainfall that feeds into the Colorado rivers, which feed irrigation ditches where our water rights are located.
Groundwater connected to surface water sources could be considered renewable if it is replenished as described above. However, the Denver Basin Aquifers can be several thousand feet below ground surface where hydrologic activity does not, for practical purposes, replenish these aquifers.