of results from pre - 2001 perennial flow transition studies

Prior to the 2001 CMER pilot study, several TFW cooperators conducted independent field studies of the distribution of perennial and seasonal headwater streams (Table 1). All of the studies were conducted during the summer low flow seasons of 1998 or 2000, in part, to evaluate proposed regulatory guidelines that differentiate non-fish-bearing headwater streams on the basis of the seasonal flow regime (i.e. perennial vs. seasonal). However, each study was designed more-or-less independently and utilized slightly different field methods.