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<br />-6- <br /> <br />use exceedec stream flow in an average year of preci?icacion. <br /> <br />In virtually t~e entire area stream flow is exceeded by ~ater <br /> <br />use in a dry year. <br /> <br />I~ areas ~here water use exceeds streao <br /> <br />flow ground water supplies must ~e ~sed :0 supplement surface <br /> <br />flows. <br /> <br />In many cases I ground water "mining" occurs. <br /> <br />In these <br /> <br />situations ground water extraction exceeds natural replenish- <br /> <br />ment. <br /> <br />~ny areas are currently experiencing the various <br /> <br />difficulties associated with serious ground water over-draft. <br /> <br />The following illustration shows where this problem is most <br /> <br />accuce. <br /> <br />It is also based on 1975 levels of withdrawal. <br /> <br />ILLUSTRATION II <br /> <br />UtE PERCENTAGE OF GROUNDWATER WITHDRAWN THAT IS IN EXCESS OF NATURAL RECHARGE RAI fS 1')1', <br /> <br />0-'" <br />o <br />10-39'"A. <br />o <br /> <br /> <br />40-69'4 <br />~"'@j <br />t:,,>:'~;;: <br /> <br />~..-.dover <br />Ell <br /> <br />(~01:e : <br /> <br />According :0 the State of Arizona Depart~ent of <br /> <br />Water Resources the sub-region in :he sout~easte~n part 0: that <br /> <br />state shou~c be shaded black.) <br /> <br />-. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />