This Ministerial Decree establishes the modalities for calculating and collecting water charges for the use of water bodies pertaining to Federal property applicable to: (a) water abstraction; (b) hydropower generation; and (c) recreational water use. Water charges shall be set in accordance with the following principles: (a) promotion of water saving and protection of water bodies; (b) differentiation of rates among different water basins; and (c) regularity of payment. Calculation of water cha