The low-flow characteristics presented in this report are the annual minimum 7-day mean flows at the 2-year recurrence interval and 10-year recurrence interval. They were determined just downstream from the confluence of the three streams forming the North Branch Manitowoc River and, based on natural-flow conditions, are 0.0 cubic foot per second (0.0 cubic metre per second). Observations made in October 1974 showed that the natural discharge of the three streams forming the North Branch Manitowoc River was 0.0 cubic foot per second (0.0 cubic metre per second). A discharge of 0.30 cubic foot per second (0.008 cubic metre per second) was measured in the tributary from Hilbert but this was predominantly effluent from the sewage-treatment plant and a cheese factory in Hilbert. The mean annual discharge for the North Branch Manitowoc River at Potter is 27 cubic feet per second (0.76 cubic metre per second). This was based on the estimated and recorded discharge for June 1, 1974, to May 31, 1975, for the North Branch Manitowoc River at Potter site and an adjustment based on the long-term mean annual discharge at gaging station 04086000, Sheboygan River at Sheboygan.
