Section 096-587-4 - Flow requirements for Class AA watersA.Narrative requirement for Class AA waters. Except as provided for in this section,flows inClass AA waters shall be maintained as they naturally occur. Withdrawal or other direct or indirect removal, diversion, activity, or use of these waters that causes the natural flow to be altered may occur as provided in paragraph 4-B below.B.Flow established by standard allowable alteration for Class AA waters. Flow in Class AA waters may not be less than the amounts defined in subparagraphs (1), (2) and (3) below, except when natural conditions alone cause those flows to be less, or as provided by an Alternative Water Flow or regulatory permit as established in sections 7 or 8 of this chapter. (1) When natural flow exceeds the spring aquatic base flow, 90% of the total natural flow shall be maintained.(2) When natural flow during the early winter season exceeds the early winter aquatic base flow, 90% of the total natural flow shall be maintained.(3) When natural flow in any other season, except as described in (1) and (2) above exceeds 1.1 times the seasonal aquatic base flow and exceeds 1.5 times seasonal aquatic base flow if aquatic base flow was calculated from methods in paragraph 3-B, 90% of the total natural flow shall be maintained.06- 096 C.M.R. ch. 587, § 4