Flooding. April 21, Notes 4/20 CONGRATULATIONS!!!!! Activity 2: AZ State Museum due TODAY. Extra Credit 2: Returned at end of class
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1 April 21, 2011 Flooding 1927 Mississippi Flood Notes 4/20 Activity 2: AZ State Museum due TODAY Extra Credit 2: Returned at end of class CONGRATULATIONS!!!!! Andrew Richard Undergraduate Research Grant 3 1
2 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? New England Deluged by Worst Flooding in Decades (NY Times, July 5, 2006) Flood costs put at $40 million (Bismark Times, Mar 31, 2009) Midwest Flood Costs: $8.5 Billion and Rising (SolveClimate.com, June 30, 2008) What would a flood cost me? Cost of Flooding 2
3 1993 Mississippi Flood 1927 Mississippi Flood 27,000 square miles Waters at flood stage for 2 months $400 Million in damages 246 people killed Southwest (Arid) Washes If entrenched, do not overtop their banks (flood) Rather, tend to strip away their banks Migrate sideways within large flood plain Re-deposit sediments later, completing cycle. 3
4 Measuring Streamflow Volume per time Velocity related to slope Typical units: cfs Cubic feet per second. Hydrographs Time series of discharge (cfs) through time (day, hour) River s response to water input 4
5 SW Streams tend to be flashy: Why? 1: In arid environments: Vegetation and soils are weak surface flow strong SW Streams tend to be flashy: Why? 2: Watershed is small: water has little space to travel SW Streams tend to be flashy: Why? 3: Steep watersheds: surface flow moves quickly to streams 5
6 SW Streams tend to be flashy: Why? 4: Watershed is urbanized: paved over Flood of 1983 It seemed like a flood of biblical proportions The numbers tell the story: 14 killed 10,000 people temporarily homeless more than 800 structures destroyed or damaged nine counties declared federal disaster areas area road and bridge damage $54 million a statewide price tag of a half-billion dollars. 6
7 Flood of 1983 Summer of , ~50 percent more rainfall than normal, Ground was saturated. Late September, hurricane Octave Six inches or more fell across a huge swath of Southern Arizona, with widespread and catastrophic results Flood Looking S from St Mary s Bridge. L Oct 2, 1983; R pre-flood 7
8 Dodge at Rillito Ina at Stana Cruz 1983 Flood North of Tucson After Rillito joins it, Santa Cruz is not entrenched 1983 Flood What happens to structures? 8
9 How Much in 1983 Flood? 1983 flood: 884,900 acre feet (af) How many years does that water Tucson? 325,851gal. 1person day 884,900 af 1af 160 gal 1yr 365 day 1Tucson 500,000peo. = ~10 Tucson years After 1983: "The rivers themselves moved. The real problem wasn't flooding, but erosion. If we're going to have flooding rivers, we have got to have something to protect the banks. In the last 20 years at a cost of $112 million Pima County 78 miles of soil cement bank protection, including 28 miles along the Santa Cruz River 24 miles on the Rillito 2 miles on Pantano Wash. 10 miles of levees, Purchased 12,000 acres of flood control property and are looking at environmental restoration projects on the Santa Cruz and Rillito. 9
10 1983 Flood Bank gouging Not overtopping Bank Reinforcement Soil Cementing the Rivers Even the grade Cement the walls Helps move water out fast But: Reduces infiltration Marana? 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) 10
11 Flood of 1993 Rated #2 Weather event of 20 th century by Tucson Weather Service January week duration several Pacific storm systems produced the wettest January on record 4-7 rain fell across the metro area between the 5th and 19th. Runoff from snow melt from the Santa Catalina Mountains added to the flood. $ million in damages 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:
12 July 31/Aug1, 2006 Rainfall totals: Upper Sabino 8-10 Molino Basin 5-6 Lower Sabino 2 Sabino Stream Gauge peak: 15,000 cfs Rainfall & runoff in Sabino Rainfall duration less than 5 hours Sabino 2006 Damage by? 12
13 Sabino 2006 debris flows Sabino 2006 Damage by? Sabino Canyon 2006 $>1 million damage Long-term stream rehab? What about houses? More than 20 deaths in last 20 years Sabino Canyon Flash Flood 13
14 Not All Floods Alike Season Storm Type Antecedent Conditions Storm Duration Total discharge Cost 1983 Oct 1-3 (fall) Hurricane + Pacific Wet Days 85,000cfs $500m 1993 Sabino Jan 3-20 (winter) July 31 (summer) Pacific Monsoon Dry Wet Weeks Hours 55,000cfs 15,000cfs $100m $1+m Total volume: 1983= 884,900 acre feet Highmagnitude events: rare Lowmagnitude events: common Recurrence interval: average time between events of a certain discharge 10-year flood: discharge that has a 10-yr RI 14
15 Recent Changes Mean about the same Variance increasing somewhat Skew off the charts! High skew: an extreme event Determine flood plain of 500-yr flood Don t build there 15
16 Flood Management Floods happen, frequently lately Soil cementing is a debatable strategy, but we re doing it Have ample setbacks, at least 500 feet, to avoid flood damage. How to Know About Paleofloods? Consider Intro. to Dendro (geos 464/564) 16
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