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Measures to prevent or correct overdraft - AllllroprlatlC':L stLltutes. - In the States In which statutes are based on priority cf appropriation, two steps are commol'ly taken when the aggregate of withdrawals of water In a designated or critical area Is found to exceed the safe annual yield: (I) closing of the area to the Issuance of further pennlts to approprlete water; and (2) restric- tion of withdrawals of water to conform to priority rights, withdrawals under the later rights being reduced or prohibited to the extent neces- sary to satIsfy thE earlier ones. In a few States the administrator has the option of Imposing systems of rotatlnn. The Oregon State Engineer has a wIde dIscretion In the selection of correctIve control provisions. He may ordar one or nore of the followIng: (I) closing of the area to further appropriations; (2) detarmlnatlor. of tha permIssIble total wfthdrClwal and Its apportionment among spproprlators In accordance wIth relatl~e priorities; (3) accorj- ing of first. orefcre~ce aesplte priorities t, domestIc ~r.1 livestock uses and ther~aft~r, in ~uch order as deemed advisable, to agrlcultcral, Industrial, munlcl~]1 other then domestIc, racreational, and other bene- fIcial purposes; (4) reduction of permissible wlthdrewal by anyone or more appropriators or wells; (5) If 2 or more wells are used by the same appropriator, adjustment of the total pennlsslble withdrawal by hIm, or complete prohibition of the use of one or more of such wells; (6) abate- ment or sea;l~g of any well responsible for ?ollutlon of the water supply; (7) Imposlticn of a system of rotation; (8) additional requirements In the publiC welfare. Nonallproprlatlon statutes. - In both Arizona and Colorado, critical areas are closed to further developme~t of ground water resources while the critical condition contInues, and new permits to drill wells and withdraw waters are limited chiefly to replacement and preservation of existing diversions and uses. The Colorado act provIdes thet pennlts must be obtained generally for all new wells and for Increases and exten- sions of eKlstlng supplIes; If located outside the boundaries of a critical dIstrict, permits to use ground water will be Issued. The Colorado permIt does not have the effect of granting or conferring a ground water right upon the user, but It Is prima facie evidence of the date and extent of the new use. The board of directors of a Nebraska ground water conservatIon district, after conferring wIth State and University officials and after notice and public hearing. may Institute corrective measures to Insure proper conservation of ground water in the district. As to the nature of permissible corrective measures, the statute Is silent. A Texas underground water conservation district may provide for the regulation of production of water from nonexampte~ wells in order to mlnlml7.~ so far as practIcable drawdown of the wal3r table or reduction of artesian pressure, or to prevsnt waste. . 12 -