... Assabet River and near the southeastern boundary of the basin. The most rapidly growing towns, however, were in the headwaters and along the northwestern upland parts of the basin; these include ... September in the Assabet River about doubled at the outlet of the Main Stem Headwaters subbasin and increased by about 4 percent at the outlet of the Main Stem Upper subbasin. These increases ... conductivity of till in the study area probably ranges from 0.01 to 10 ft/d (Allen and others, 1963; Randall and others, 1988; Melvin and others, 1992; Tiedeman and others, 1997; Lyford and others, 2003;...