“ Average reconstructed annual ﬂow for the period 1844–1848 was lower than the observed ﬂow for 1999–2004. ” Connie Woodhouse et al. Water Resources Research, 2006
“ The long-term perspective provided by tree ring reconstructions points to looming conﬂict between water demand and supply in ” the upper Colorado River basin. Connie Woodhouse et al. Water Resources Research, 2006
MEGADROUGHT intensity at least equivalent to modern multiyear droughts duration longer than the several years to decade thereofSeager et al., Journal of Climate, 2008
1,200 years of Colorado River discharge Meko et al., GRL, 2007
THE COLORADO RIVER COMPACT divides water from the Colorado River among seven western states.
Tree rings provided the central evidence that caused municipal water agencies to“RETHINK OLDASSUMPTIONS” about worst-case scenarios for reservoir operations and re-evaluate the potential duration and geographic scope of severe drought.
Terry Hash planted 800 acres of co on, corn, wheat and sorghum. Almost all of it was destroyed by the 2011 Texas drought.Jay Janner
Palmer Drought Severity Index The PDSI incorporates historical records of precipitation and temperature into a water-balance model to estimate the amount of water available in the soil relative toaverage conditions and is typically produced once a month.
+4 extreme wet -4 extreme drought (compared to ‘average’ for that place)