 Arroyo Aguague discharges to Penitencia Creek from the south, but summer inflow is very low; however, the stream flows in the Calaveras Fault zone and does not go completely dry, even in severe droughts.Lower down it forms the rough boundary between the Berryessa and Alum Rock districts of San Jose.Unlike most creeks in the Santa Clara Valley, it follows a mostly natural course and does not have concrete or gabion embankments.