introduction concrete pipe Weir Walls Unadvertised in Lafarge product catalogues are a number of specialty items that we are able to provide. One of the most common components requested for manhole or control vault structures are weir walls. Lafarge is able to provide precast weir walls as part of the majority of our manhole structures. These walls can be cast to any internal height necessary and shaped to accommodate v-notches, steel plates, or openings as required. Please contact your local Lafarge Pipe representative for weir wall alternatives to suit your project needs. stormwater treatment technologies For information on precast concrete box sections, including manufacture, applicable specifications, and design please refer to the Box Sections chapter of this eManual. introduction CONCRETE PIPE box sections BOX SECTIONS concrete pipe Providing long-lasting precast concrete drainage materials for large underground storm storage and conveyance applications. stormwater treatment technologies LAFARGE PIPE 6920 13 Street SE Calgary, AB T2H3B1 Tel. (403) 292-9501 Fax: (403) 255-2677 box sections manhole and catch basin material manhole and catch basin material LAFARGE PIPE eMANUAL PAGE 51