The normally dry Rillito River and Tanque Verde Creek have been flowing steadily in recent weeks even though Tucson has had no rain since a mere 0.01 of an inch on Jan. 24.
The shallow but persistent streams, fed by snowmelt from mountains, will help replenish much-needed groundwater, experts say.
βThe slower flow you get from snowmelt does help with (groundwater) recharge,β said Suzanne Shields, director of the Pima County Flood Control District.
βIt has more chance to soak in β infiltrating as itβs flowing because itβs going slowly,β as opposed to rapid runoff from heavy rains, Shields said. βThis has been happening over several days. Itβs not just a short event, ... this is very beneficial.β
Professor Thomas Meixner, a University of Arizona hydrologist, also sees recharge benefits from the continuing stream flow.
βWinter has been decently wet so far, and the amount of snow in the Catalinas means an extended runoff season in mountain streams,β Meixner said. βThat should translate to above-average recharge.β
Meixner said he expects the stream flows and recharge to continue in the coming days and perhaps weeks.
βEssentially, infiltration and recharge on the Rillito is directly dependent on how long it flows,β Meixner said. βMy guess is that the next two weeks will see pretty good flow.β
RIVERSIDE RECREATION
A stream that flows for weeks rather than days is a relative rarity in the Tucson valley β and many people have taken the opportunity to walk along, or in, the waters of Tanque Verde Creek and the Rillito.
Some have brought their dogs for a frolic in the flow.
One popular spot is along North Craycroft Road where Tanque Verde Creek and the Pantano Wash come together to form the Rillito.