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. . . 002H3 ground water system, or diminish the gradient to the river, resulting in little or no discharge of ground water to the river. In either of these cases, ground water table elevations along the river will increase and may, in sensitive areas, result in water supply and waste water disposal problems, loss of land productivity as well as property damage. Such areas mayor may not experience surface water flooding. Compensation for losses and damageSj~ caused by flood-related high ground water is generally not provided under the National Flood Insurance Program. On only a few occasions since Hoover Dam closure in 1935 have river flows in various reaches of the river even~ approached the F100dway elevation flow. To prevent or reduce damages that may occur with associated high ground water levels, high ground water-prone areas should be identified and reflected in the development plans and flood plain management planning and practices. Section 7 of the F100dway Act provides for the use ofD federal expenditures or financial assistance within the Colorado River F100dway for remedial or corrective actions, including, but not limited to, drainage facilities essential to assist in controlling adjacent high ground water conditions caused by flood flows. It is recognized and understood that drainage or pumping facilities and other corrective measures needed may, of necessity, extend to or be required for areas outside the Floodway and that the provisions for the use of federal expenditures or financial assistance should apply to such facilities and measures. RECOMMENDATION U!<<"'IS' ,erecommended ~~tha,t 6fi~ non""'rndeian ~ l,and's~~ttre-BuTeau~-op. Rec lam,a!:ionei.ca-s-si-S-\;ed'~ by~tche'United.:&t.a.t.es~GeolO'!Jeical:cS ucrvey , c,onduct_an~ hwest is at iOIl Stf -p()~1;!'!I11;ia1.!1 igh _~9l"9un<Lw,ater,-prone ~eas..at~ the i'~ood~w:ay..elev.aj;iQnfJ_o'd,.... Recommendations should be developed for potential mitigation measures including, but not limited to, river channel dredging, ground water pumping programs, levee improvements, changes in land management practices, and public land acquisitions or transfers. Entities responsible for area development plans and flood plain management should be advised of flood-related high ground water-prone areas and the recommended potential mitigation measures. After the potential problem areas have been identified and mapped, it is recommended further that the Federal Emergency Management Agency conduct an evaluation of the potential damage which might occur to both existing public III-20