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Last modified
11/23/2009 10:24:59 AM
Creation date
8/3/2007 10:17:40 AM
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Floodplain Documents
County
Statewide
Title
Historical Perspectives on Colorado Drought
Date
12/1/2003
Prepared For
CWCB
Prepared By
HDR
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />Historical Perspectives on Colorado Drought <br /> <br /> <br />I <br /> <br />G <br /> <br />H <br />~ <br /> <br />00 <br /> <br />[;] <br /> <br />o <br />. <br /> <br />..e~ <br />(. . <br />~.... <br />~f ~~ <br /> <br />While Palmer's indices are watcr balance indices <br />that consider water supply (precipitation), demand <br />(evapotranspiration) and loss (runaff), the <br />Standardized Precipitatiollll/dex is a probab: <br />index that considers only precipitation. <br /> <br />ity <br /> <br /> <br />wet <br /> <br />The index is negative for drought. and positive for <br />wet conditions. As the dry or wet conditions <br />become more severe, the index lx.-comcs more <br />negative or positive. The SPI is computed by <br />NCDC for several time scales. ranging from one <br />month to 24 months. to capture the various scales <br />and long.tenn drought. <br /> <br />Extremely <br />. <br />Very wet <br />~Ioderately <br />wet <br />:\'ear norma <br />:\lOdcratel)" <br />dry <br />SeHrcl~' dry <br />,E},Ir.cmely _dr <br /> <br />short.tenn <br /> <br />~ 2.0 <br />.5 to 1.99 <br /> <br />to 1.49 <br />~~-, <br />to 0.99 <br /> <br />10-1.49 <br /> <br />to-l.99 <br />~.2.0. <br /> <br />of both <br /> <br />The sri has been used operationally to monitor conditions across Colorado since <br />1994 (McKee el aJ. 1995). This nationwide SPI map unmistakably illustrates the <br />severity of the 2002 drought across the entire state of Colorado and much orthe <br />southwestern United States. <br /> <br />+2.0 and above (extremely wet) <br />+1.50 to +1.99 ~ery wet) <br />+1.0 to +1.49 (moderitely wd) <br />-O.99to +6.99 (near no.lO'" <br />.1.00 to .1.49 <br />.1.50 to .1.99 <br />-2.0 a'ld Jess <br /> <br />(InOdefalely d.y <br />(Sf:lVEfefy dry) <br />(exlfEfnely d.y <br /> <br />. <br />CiI <br />I:.'l <br />o <br />o <br />b] <br />. <br /> <br /> <br />Ce....er <br /> <br />COpyllght 02002 Nition.1 OIougld Mitigation <br /> <br />2002 (NOMe 2003) <br /> <br />12-month SPI through the end of August <br /> <br />11 <br /> <br />Figure <br /> <br />from? <br /> <br />To bener appreciate the forces at work during a period of drought, '\'e first must take <br />a brieflook at the variability in precipitation across the state from both the <br />perspective' oflocation and time. Figure 12 depicts the annual precipitation found <br />across the state; observe that annual precipitation and elevation are well correlated. <br />By simply examining this figure and Figure 13 immediately below it. one can infer <br /> <br />Page 15 <br /> <br />HDR Engineering, Inc. <br />Printed on 30% post-<:onsumer recycled content paper <br /> <br /> <br />.0 <br /> <br />.0.99 <br /> <br />-1.0 <br /> <br />-1.5 <br /> <br />(. <br /> <br />P/'llcipitation come <br /> <br />Water AVailability: wIIere does tIIa <br />
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