Section 51.512 - Alternative Plans of Taxation(a) The district's taxes for all purposes, except to pay the cost of preliminary surveys, may be levied, assessed, and collected on an adopted basis to be chosen from the alternatives provided in this section.(b) The district's tax plan may be based on any one of the following:(3) ad valorem basis to obtain a part or percentage of the total tax or to apply to a specific part of the district and benefit basis applied to the other part of percentage of the tax or to the remaining part of the district; or(4) either ad valorem or benefit basis on designated property or defined areas of the district to pay for improvements, facilities, or service peculiar to the defined part of the district and not generally and directly benefiting the district as a whole. Acts 1971, 62nd Leg., p. 351, ch. 58, Sec. 1, eff. 8/30/1971.