Riverside Finished Water Conduits’ Rehabilitation

The Citizens Energy Group’s finished water from the White River Water Treatment Plant to the Riverside Reservoir is transported through a 48-in. and a 60-in. conduit. The 48-in. was installed in approximately 1909 and is approximately 4,270 ft in length. The 60-in. was installed approximately in 1929 and is approximately 4,475 ft in length. The capacity of the 48-in. is 39.2 MGD and the 60-in. is 68.1 MGD flowing by gravity. These two conduits provide a redundancy to the Riverside Pump Station, which pumps 30–35 MGD from the Riverside Reservoir. Based on a conditional assessment of each pipe, both conduits are currently in a condition that warrants a rehabilitation. All access points have been located and mapped including GPS coordinates with depths were used to generate a pipe profile. A majority of the pipeline was televised. A rehabilitation plan was developed in two phases. The first phase was to provide security to all access points by raising manhole lids and replacing the castings with a new sealed, bolted, and locked inner lids. Other security measures include fencing and locking gates. The next phase of rehabilitation includes the lining of each conduit. Since either conduit is sized to match or exceed the pumps at the Riverside Station, the conduits will be taken out of service separately due to the redundancy or double capacity of the conduits without affecting the flow at the Riverside Pump Station. The 48-in. conduit has a cross section shape like a guitar pick and will be rehabilitated first. Many methods of lining were evaluated during this process with the requirement to be NSF approved material due to the finished water. Once completed there will be two rehabilitated and structurally sound conduits that will offer capacity and redundancy to the Riverside Pump Station for years to come.