Continuing the Scourges of Mankind Fires Pests Droughts Today----Floods Southwest Flooding --in the desert??? Rain-streamflow cycle Hydrographs Recurrence Interval Three Examples from Tucson “washes” as representative of Southwest. Why Care About Floods?. Fate of Rainfall.
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Continuing the Scourges of Mankind
--in the desert???
= - - -
1: In arid environments: -
2: Watershed is small: --
3: Steep watersheds:
4: Watershed is urbanized:
Looking S from St Mary’s Bridge. L Oct 2, 1983; R pre-flood
Dodge at Rillito
Ina at Stana Cruz
= ~10 Tucson years
Doug Shakel, geology professor at Pima Community College calls the county's soil cement project a "channelization effort" and labels what the county has implemented as a "flood guarantee program" that will prevent erosion but aggravate flooding.” (Devine 2003, Tucson Weekly)
Rated #2 Weather event of 20th century by Tucson Weather Service
January 1993 – ----
Sabino Canyon is 'forever changed' Record flood that swept through July 31 left the treasured site 'a different place‘Doug Kreutz, Arizona Daily Star Tucson, Arizona | Published: 08.12.2006
Upper Sabino– 8-10”
Molino Basin– 5-6”
Sabion Stream Gauge peak: 15,000 cfs
Rainfall duration less than 5 hours
$1 million damage
What about houses?
No deaths in this one,
but 2 dead 2007,
More than 20 in
last 20 years
Total volume: 1983= 884,900 acre feet
Consider Intro. to Dendro (geos 464/564