Maintaining Efficient Flow Through Manholes

Efficient flow within a manhole is an often-overlooked aspect of collection system construction and rehabilitation. Controlling the flow from elevated inlets is critical to reducing odors, H2S release, and structure erosion. Inside manhole drops are particularly advantageous as they are simple to maintain and cost-effective to install. By using an inside drop for all elevated inlets and service connections, influent is efficiently conveyed to the invert channel and released in the flow direction. The accumulation of solids on the manhole bench is eliminated and solids and liquids remain together. Smooth manhole invert channels improve flow capacity reducing the occurrence of system backups and standing sewage within the manhole.

RELINER^®/Duran Inc. provides a full range of products specifically developed to provide efficient, controlled conveyance of flow through manholes. RELINER Inside Drop Bowls capture inflow and convey it directly to the invert channel though the drop pipe. They are available with outlets ranging from 4” to 24” and are available to fit most round and flat-walled structures. Force line hoods are available for high velocity inlets. RELINER modular manhole invert channels are made from marine-grade fiberglass, providing a consistent cross-sectional area with very high flow capacity for the most efficient conveyance through the manhole. WW

RELINER^®/Duran Inc. is a Connecticut-based manufacturer of products for use in the wastewater and construction industries. To learn more, visit www.reliner.com.