October 2009 - South Tahoe Public Utility District

One of the concerns of the existing recycled water C-line conveyance system is the inability to
bypass recycled water flow around Harvey Place Reservoir for maintenance or emergency
purposes. The Harvey Place Reservoir Bypass System Piping project coupled with the
Recycled Water Irrigation Fields (Project No. 1, page 9-61) and the pump back system (Project
No. 3, page 9-65) would allow the District to convey recycled water directly from the Importation
Pipeline (C-line) to the new irrigation fields or the Diamond Ditch. This system allows for flexible
management of the Harvey Place Reservoir water level, irrigation of the temporary storage
facility with recycled water, and a means of conveying recycled water directly to the Diamond
Ditch system.
9.2.1 Project Description
The Harvey Place Reservoir Bypass System includes the pipeline facilities necessary for
conveyance of water to and from the irrigation fields and is shown in Figure 9.2 (located at the
end of Section 9). The new pipelines for the Harvey Place Reservoir Bypass System include
the following facilities.
1) Harvey Place Reservoir Bypass Pipeline
2) District Pasture Pipeline
3) Harvey Place Reservoir /Irrigation Field Connector Pipeline
The Harvey Place Reservoir Bypass Pipeline will connect to the C-line just south of the Millich
Ditch crossing. This approximately 10,800 foot pipeline would be a pressurized, gravity flow 24-
inch diameter pipeline capable of carrying the District‟s projected future recycled water flow of
approximately 5.8 MGD. The increase in pipe diameter from the existing C-Line is required to
minimize friction head losses. The District Pasture Pipeline is planned to terminate at the
irrigation fields
The District Pasture Pipeline would begin with a valve station on the C-line above the District
pasture. This approximately 5,800 foot pipeline would be a pressurized, gravity flow 24-inch
diameter pipeline capable of carrying the District‟s projected future recycled water flow of
approximately 5.8 MGD. The increase in pipe diameter from the existing C-Line is required to
minimize friction head losses. The District Pasture Pipeline is planned to terminate at the
Harvey Place Reservoir Bypass Pipeline just south of the irrigation fields. The Harvey Place
Reservoir Bypass Pipeline will work in conjunction with the District Pasture Pipeline to allow
freshwater Snowshoe Thompson No. 1 ditch flow to be relocated to the existing C-Line pipe
between the connecting points of the two proposed pipelines to accommodate an increase in
future flushing flows for Indian Creek Reservoir without having to repair the Snowshoe
Thompson No. 1 ditch between those two points (approximately 5,000 feet).
The Harvey Place Reservoir /Irrigation Field Connector Pipeline is a pipeline connecting the
Harvey Place Reservoir with the irrigation fields. The pipeline would be bidirectional. The
pipeline would be sized to meet a desired flow rate from Harvey Place Reservoir to the irrigation
fields or the pump back rate to the reservoir. The only capacity limiting factor is the existing 24-
inch diameter pipeline connected to the Harvey Place Reservoir Outlet Facility and the pipeline
within the facility.
The Harvey Place Reservoir /Irrigation Fields Connector pipeline length is approximately 2,100
feet and is master planned as 24-inch diameter. This pipeline is planned to connect to the
existing Diamond Valley Ranch Pipeline. The Diamond Valley Ranch Pipeline is an existing 24-
inch diameter steel pipeline and it provides a method of directing flow from the Harvey Place
South Tahoe Public Utility District
Recycled Water Facilities Master Plan - October 2009 Page 9-64