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<br />reevaluated periodically. Also, limits on the choices <br />exist which constrain action. <br />A principal constraint is uncertainty about how salt <br />loading and transport actually works. Although the costs <br />of monitoring and studying that process may be <br />prohibitively high since much of it occurs underground <br />and out of sight, additional research in this area could <br />yield information that ultimately would save money in the <br />selection and implementation of salinity control <br />measures. Additionally, past choices constrain future <br />ones. Early development proceeded with little attention <br />paid to the effects downstream. To now come in and upset <br />the status quo by requiring water users to shut down or <br />pay for their salt-producing operations is unacceptable <br />to many; but if new rules were to apply only to <br />prospective users, this would seem unfair to them. Heavy <br />past irrigation in salt loading areas would make it <br />difficult to retire that farmland, even assuming that <br />this would be a desirable choice, regardless of whether <br />selective retirement would be the most economical <br />approach to salt control. <br />Political constraints also exist. The wisdom of <br />federal control over private land use is highly <br />debatable. Local governments in rural areas generally <br /> <br />-32- <br />