October 2009 - South Tahoe Public Utility District

to initially irrigate the temporary storage facility is negligible because it can be accomplished
with flood irrigation.
9.4.4 Phase 2 – Diamond Valley Irrigation Distribution Network for
Fresh and Recycled Water
Phase 2 of the Diamond Valley irrigation distribution network would be triggered by the need for
greater irrigation efficiency and/or the requirement to dispose of recycled water. The New
Harvey Place Reservoir Feeder Main pipeline is planned to branch from the Harvey Place
Reservoir bypass pipeline (terminating at the end of the existing C-Line) and distributes water to
the southern perimeter of irrigated lands and to the southwest section of Diamond Valley. This
trunk line is planned to feed smaller diameter irrigation pipes capable of supporting sprinkler,
subsurface, and flood irrigation practices.
The cost of this system is dependent upon the irrigation method selected; however, the
conceptual cost for the distribution piping is $1.9 million.
9.5 Project No. 5 - Diamond Ditch Conveyance Improvements
This project addresses the purpose and need statements:
PN-7. Operational control of the distribution system is insufficient.
PN-10. Recycled water systems are needed to improve operational flexibility.
This recommended project includes the following aspects.
(1) Providing capacity improvements at Bar Screen No. 5.
(2) Modifying Bar Screen No. 3.
(3) Installing a casing pipe for the existing recycled water pipeline crossing the Paynesville
Bridge.
(4) Installing erosion control measures on the Diamond Ditch upstream and downstream of
the Snowshoe Thompson No. 2 diversion structure.
The District faces an operational constraint at Bar Screen No. 5 due to potential clogging, which
requires frequent maintenance and/or cleaning of the screen. This project intends to fix this and
other problems with the existing conveyance system.
The total conceptual cost for The Diamond Ditch Conveyance Improvements is $1.2 million.
The individual component conceptual costs are as follows.
(1) Improvements at Bar Screen No. 5 - $0.09 million
(2) Modifying Bar Screen No. 3 - $0.18 million
(3) Install casing pipe on existing pipeline crossing the Paynesville Bridge - $0.66 million
(4) Installing erosion control measures downstream of the Snowshoe Thompson No. 2
diversion structure - $0.27 million.
South Tahoe Public Utility District
Recycled Water Facilities Master Plan - October 2009 Page 9-68