The term "converted wetland" is defined as “wetland that has been drained, dredged, filled, leveled, or otherwise manipulated (including any activity that results in impairing or reducing the flow, circulation, or reach of water) for the purpose or to have the effect of making the production of an agricultural commodity possible if--
(i) such production would not have been possible but for such action; and
(ii) before such action--
(I) such land was wetland; and
(II) such land was neither highly erodible land nor highly erodible cropland.
(B) Wetland shall not be considered converted wetland if production of an agricultural commodity on such land during a crop year--
(i) is possible as a result of a natural condition, such as drought; and
(ii) is not assisted by an action of the producer that destroys natural wetland characteristics.” (16 USCS § 3801)