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Project D

April 2025City of Toronto
Engineering plan view of a water pipeline showing a 45° horizontal bend connecting valve box VB 1 to thrust valve box TVB 1, near an existing valve box (EX.VB), with a 0.9 m offset dimension marked

Toronto Water requested this replacement for the aging watermain, a pipe originally built about a hundred years ago and now targeted for full replacement to keep the system reliable and cut the risk of future failures. The design covers roughly 130 to 134 metres of new main and had to work around a 1500 mm transmission main running along the same alignment, which meant holding a minimum 0.5 m vertical clearance and routing horizontal bends around a nearby TWSI, sidewalk, and boulevard.

Standard cover of 1.65 m was achieved gradually across the alignment, and sections that couldn’t reach it were protected with 50 mm insulation board instead. The design also closed a gap in fire hydrant coverage, adding a new hydrant to meet the 115 to 120 m spacing standard for residential areas, coordinated sewer crossings to keep 0.5 m of vertical clearance, and specified a tapping sleeve and valve so the new main could be cleaned and disinfected before tying into the system. Designed April 2025 to February 2026.

Blue HDPE watermain pipes laid in an open trench of sand and gravelDesign plan detail for the watermain, showing the existing main to be abandoned and a new hydrantProfile view of a proposed PVC watermain, showing depths, crossings with existing utilities, and thrust restraint notesCross-section of a typical roadway trench restoration around a buried pipe.Horizontal bendProfile view of a proposed watermain connecting to an existing main via a tapping sleeve and valve, with horizontal bends and valve boxes along the route.Case B - Insufficient Ground CoverCross-section detail of the new PVC watermain alongside an existing gas main and Rogers conduitTable 37: Hydrant spacing in right of wayPlan view of a proposed watermain running along a grassed boulevard between residential lots.Profile view of a pipe crossing near a 200mm sanitary sewer, with clearance depths noted.