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20 <br />Table 2-1. Seasonal instream flow recommendations (= Aquatic <br />Base Flows) for rivers in New England with different <br />flow records. Values are expressed as m3/s/km2 and <br />ft3/s/sq mile (in parentheses); MMF = median monthly <br />flow. Source: U.S. Fish and Wildlife Service (1981). <br />Availability of historical flow records <br />Season <br />Springb <br />(April - mid June) <br />Summer <br />(mid June - September) <br />Fall/winterb <br />(October - March) <br /><25 years >25 yearsa <br />0.29 (4.0) 100% MMFc <br />0.04 (1.0) 100% MMFc <br />0.07 (0.5) 100% MMFc <br />aOther criteria, in addition to record length, that are used to decide <br />whether to accept/reject the gaging record include: (1) ±10% <br />accuracy, or better; (2) drainage basin is >130 km2 (50 sq miles); <br />(3) river is unregulated. <br />bSpawning/incubation periods. <br />cIf reservoir inflow is < MMF, then outflow = inflow. <br />k <br />i <br />