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Figure 2.2 <br />Natural stream flow is highest in the winter and spring <br />sOURcE: california department of Water Resources. <br />NOTEs: Unimpaired flows (without dams or diversions) on the sacramento River, 1906–2005. Water year 1977 (October 1976– <br />september 1977) is the driest year on record, and water year 1983 is the wettest year on record. <br />Figure 2.3 <br />Natural stream flow varies greatly across years <br />sOURcE: california department of Water Resources, california data Exchange center data. <br />NOTE: The figure shows unimpaired flows (the natural flows that would have occurred without dams or diversions) on the sacra- <br />mento River, 1906–2009. <br />1977 (5.6 maf) <br />Average (28.2 maf) <br />1983 (71.9 maf)Flow (maf)AugJulJunMayAprMar <br />Sacramento River, 1906–2005 <br />FebJanDecNovOct Sept <br />14 <br />12 <br />10 <br />8 <br />6 <br />4 <br />2 <br />16 <br />0 <br />Unimpaired annual flow (maf)20011996199119861981197619711966196119561951194619411936193119261921191619111906 2006 <br />35 <br />30 <br />25 <br />20 <br />15 <br />10 <br />5 <br />40 <br />0