Abstract: The author previously published a paper that addressed spatially increasing flow in collection conduits [1]. Analyses were given for circular and rectangular channels flowing with free-surface and full-channel flow. That paper referred to, but did not present, generalized solutions obtained by the author for horizontal, circular
channels with a free or submerged discharge with constant or spatially-increasing flow. The author has used those solutions for the design of skimmer channels at wastewater treatment plants. Those solutions are presented here. Examples from the author's practice are presented.
Keywords: Dimensional analysis; Hydraulic design; Numerical Analysis; Open channel flow; Pipe flow.
[1] Graber, S.D. (2004). "Collection Conduits Including Subsurface Drains." Journal Environmental. Engineering., 130(1), Pp. 67-80.
[2] Keifer, C.J., And Chu, H.H. (1955). ''Backwater Functions By Numerical Integration.'', Transactions. American. Society Civil Engineers, 120(1), Pp. 429–448.
[3] Chow, V.T. (1959). Open-Channel Hydraulics. Mcgraw-Hill Book Co., New York.
[4] Hager, W.H. (1991). "Backwater Curves In Circular Channels.", Journal Irrigation. & Drainage Engineering, 117(2), Pp. 173-183.
[5] Laquidara, M., Garrity, G., Tyler, C., Waitt, W., And White, N. (1998). "Water Testing The Secondary Treatment Facilities At Mwra's Deer Island Wastewater Treatment Plant", New England Water Environment Association Journal, 32(2), Pp. 126-137.
