chargeable premium rates for any types and classes of properties for which insurance coverage shall be available under section 4012 of this title (at less than the estimated risk premium rates under section 4014(a)(1) of this title, where necessary), and

the terms and conditions under which, and the areas (including subdivisions thereof) within which, such rates shall apply.

based on a consideration of the respective risks involved, including differences in risks due to land use measures, flood-proofing, flood forecasting, and similar measures;

adequate, on the basis of accepted actuarial principles, to provide reserves for anticipated losses, or, if less than such amount, consistent with the objective of making flood insurance available where necessary at reasonable rates so as to encourage prospective insureds to purchase such insurance and with the purposes of this chapter;

adequate, together with the fee under paragraph (1)(B)(iii) or (2) of section 4014(a) of this title, to provide for any administrative expenses of the flood insurance and floodplain management programs (including the costs of mapping activities under section 4101 of this title);

stated so as to reflect the basis for such rates, including the differences (if any) between the estimated risk premium rates under section 4014(a)(1) of this title and the estimated rates under section 4014(a)(2) of this title; and