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Last modified
11/23/2009 10:24:59 AM
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8/3/2007 10:17:40 AM
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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 />significance for <br /> <br />livestock production ,[lIese impacts would have widespread <br />Colorado's society, economy, and ecology. <br /> <br />In their review of Great Plains droughts over the past 2000 years, Woodhouse and <br />Overpeck (1998) summarize, saying "the paleo-climalic data suggest a 1930s- <br />magnitude nust Bowl drought occurred once or twice a century on~r the P:hl <br />300-400 lears, and a decadal-Ienglh drought once ('''"cr)' 500 )'ears." <br /> <br />lcoclimalic data <br />a 1930s- <br /> <br />iiIllDl <br /> <br />the following: <br /> <br />Historical documents. tree rings. archaeological remains. lake sediment. and <br />geomorphic data make it clear that the droughts orthe twentieth century, <br />including those of the 19305 and 19505. were eclipsed several times by <br />droughts earlier in the last 2000 years, and as recently as the lale sixk"Cnth <br />century. In general, some droughts prior to 1600 appear to be characterized <br />by longer duration (i.e., multidecadal) and greater spatial extent than those of <br />the h..'entielh century (Woodhouse and O....erpeck 1998). <br /> <br />The United States map below (Figure 5) was prepared by NOAA using a natIonal <br />tree ring data base that was used to prepare a standardized set of tree ring ....alues of <br />the Palmer Drought Severity Index (POSI). Henz and Badini,2002 prepared a <br />detailed comparison of the <br />tree-ring growth index at <br />the four points shaded <br />within Colorado. A <br />comparison of tree ring <br />dcri....ed and instrumented <br />SPI and PDSI values for the <br />important Colorado drought <br />periods during the past 100 <br />years was developed. <br />Special attention was given <br />to recent period droughts <br /> <br /> <br />magllltude ()u~t 80\\ I <br />drought occurred once <br />or tnice a ccntury O\C( <br /> <br /> <br />lIe l'a~1 ~ 00-400 ~.ears, <br />and :l decadaf-Ienglh <br />drought once e".er~. 500 <br />~.ears"._ <br /> <br />- <br /> <br />[II <br /> <br />{)\'('rpeck <br /> <br />.- <br /> <br />-.. <br />- <br /> <br />.> <br />.' <br /> <br />tree <br /> <br />ith <br /> <br />that the drought periods correlation w <br /> <br />Figure 5 <br /> <br />of the 1930s and 1950s to insure <br />ring derived drought periods. <br /> <br />The dala in Table 3 is based on an analysis of the occurrence of wet and dry decades <br />based on the tree-ring PDSI of four data points in Colorado sho.....n in the shaded area <br />in Figure 5 above. The four sites .....ere used to analyze the occurrence historically of <br />droughts in the northemeastem, southeastern. southwestern and northwestern areas of <br />the state. <br /> <br />Analyses of the Colorado sites produced similar depiclions of.....et and dry decades. <br />However. a number of dry decades that affected only the western or eastern half of <br />the state were evident. It should be noted that at least one dry deeade affects the <br />entire stale eaeh millennia. <br /> <br />Page 8 <br /> <br />paper <br /> <br />HDR Engineering, loc. <br />Printed on 30% post-consumer recycled content <br /> <br /> <br />Elaborating on these conclusions, the authors report <br />
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