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<br />not provided otherwise, it seems clear that an <br />owner of land is entitled to appropriate sub- <br />terranean waters found beneath his lands. Thus <br />in fhose areas overlying landowners have a <br />property right in "access" to an underlying <br />aquifer.2 The right of access is arguably a con- <br />stitutionally vested right that cannot be taken <br />away without payment of compensation. If it is so <br />vested, the access right is thus something more <br />than a mere license revocable at will. Even so, it <br />seems equally clear that landowners have no <br />property right in the water itself. Water is public <br />property, apparently even after capture, in light ot <br />Sporhase. <br />Given private (possibly vested) rights of aquifer <br />access and public rights to aquifer water, land- <br />owners have little assurance of a continued right <br />to use a source of groundwater. Sporhase clearly <br />states that the public may limit or deny private <br />use of groundwater when the public welfare is at <br />stake. Private use is permitted only at the suffer- <br />ance of the general public. But the rule of law <br />announced in Olson v. Wahoo3 and uniformly <br />adhered to until the Sporhase decision,4 stated <br />that "the ownerof land is entitled to appropriate <br />subterranean waters found under his land,... and <br />if the natural underground supply is insufficient <br />for all owners, each is entitled to a reasonable <br />proportion of the whole,... .,,5 (emphasis added) <br />This language strongly suggests that land- <br />owners overlying a common aquifer have pro- <br />portional rights in the store of water found there- <br />in, rights based on ownership of land not on <br />history of use.6 Under this interpretation of the <br />Nebraska Rule, landowners overlying a common <br />aquifer could be restricted in the amount of water <br />that they could withdraw, but moratoria on new <br />drilling would be constitutionally suspect'? On <br />the other hand, moratoria might be characterized <br />as reasonable police power regulation of proper- <br />ty rights to land rather than a taking of the <br />property right to groundwater, thereby avoiding <br />constitutional difficulties.8 In any event, land- <br />owners at most have an assurance that they will <br />not be disadvantaged vis a vis other overlying <br />landowners; they have no assurance that they <br />can continue to pump indefinitely into the future. <br />In addition to arguable proportional treatment, <br />landowners are protected in other ways from <br />arbitrary exercise of the powerto restrict ground- <br />water use. Under the rule announced in Olson it <br />is possible that only restrictions on use that are <br />related to the overlying land could be sustained.9 <br />Thus, a prorata reduction of pumping could be <br />implemented as could use restrictions that <br />varied with the crop irrigated or the capability <br />class of the land. Similarly, the state may be able <br />to suspend pumping over an entire aquifer with- <br />out payment of compensation. <br /> <br />2-2 <br /> <br />But for the limited protections developed <br />above, a landowner's right to use groundwater <br />may be no more than a license revocable by the <br />state at will. Further, because prescriptive rights <br />(rights obtained only because of long-continued <br />use) do not run against the state, no right to <br />continue using water arises from use, no matter <br />how long a histoy of use can be demonstrated. <br />Thus, the state can probably limit groundwater <br />withdrawals, prohibit groundwater withdrawals, <br />restrict groundwater uses, alter statutory prefer- <br />ences, or otherwise affect the use of ground- <br />water without payment ot compensation as long <br />as the restrictions are not arbitrary or discrimin- <br />atory. <br />The Nebraska Rule of Reasonable Use also <br />establishes an upper limit on the amount of <br />groundwater that can be withdrawn and used by <br />overlying owners. This upper limit is defined as <br />the amount that can be reasonably and bene- <br />ficially applied to overlying land owned by the <br />withdrawing party. Private landowners should be <br />able to pursue a private cause of action against <br />any other landowner who exceeds this upper <br />limit. The difficulty is In determining when the <br />upper limit is reached. Absent statutory <br />direction, 1 0 the Nebraska Supreme Court would <br />probably adopt a definition based on the concept <br />of "waste" and most non-malicious uses of water <br />would be permitted. Thus, in normal course, a <br />landowner has very little ability to protect a <br />supply of groundwater from encroachment by <br />others. <br />A landowner's ability to protect a supply of <br />groundwater improves, however, if it can be <br />demonstrated that supplies are insufficient to <br />meet the needs of all overlying owners bringing <br />the "sharing in time of shortage" language of <br />Olson into play. Unfortunately, no definition of <br />shortage can be found in case law or in statutes. <br />Nor is there any real indication of who is entitled <br />to share in time of shortage. Individual rights <br />would probably be correlated using tort prin- <br />ciples designed to balance the equities among <br />competing users bearing in mind that, at least in <br />the absence of statutory direction to the contrary, <br />all overlying users are entitled to a reasonable <br />share of the whole. However, there is no method <br />by which a landowner can quantify his rights to <br />water in place.11 <br /> <br />PROTECTION OF PUBLIC RIGHTS <br /> <br />The public power to regulate and control <br />groundwater use appears to be exceedingly <br />broad in light of recent NebraSka Supreme Court <br />decisions. There may, however, be some limits on <br />the power of the state to vest groundwater rightS <br />in private hands given the strong statements of <br />public ownership found in the Sporhase decision. <br />