Section 241 of R A 7160

SEC. 241. Ordinance Imposing a Special Levy. - A tax ordinance imposing a special levy shall describe with reasonable accuracy the nature, extent, and location of the public works projects or improvements to be undertaken, state the estimated cost thereof, specify the metes and bounds by monuments and lines and the number of annual installments for the payment of the special levy which in no case shall be less than five (5) nor more than ten (10) years. The sanggunian concerned shall not be obliged, in the apportionment and computation of the special levy, to establish a uniform percentage of all lands subject to the payment of the tax for the entire district, but it may fix different rates for different parts or sections thereof, depending on whether such land is more or less benefited by the proposed work.