(a) The assessment shall refer to the fiscal year to which it applies and shall do all of the following:
(1) State the net amount, determined in accordance with Section 50061, to be assessed upon assessable lands within the district, which shall include an amount sufficient to pay the principal and interest due during the fiscal year from each parcel on any bonds or notes issued pursuant to Section 50068, and shall also include the amount needed to pay for the long-term natural habitat maintenance program of a district.
(2) Describe each assessable lot or parcel of land within the district.
(3) Assess the net amount upon all assessable lots or parcels of land within the district by apportioning that amount among the several lots or parcels in proportion to the estimated benefits to be received by each lot or parcel from the improvements.
(b) The assessment may refer to the county assessment roll for a description of the lots or parcels, in which case that roll shall govern for all details concerning the description of the lots or parcels.