MWD proposes to develop a project that would allow water from MID or other sources to be brought into MWD through Madera Lake, which is owned and operated by MID. Madera Lake is supplied by an existing turnout off the Fresno River which is fed by the upstream watershed regulated by Hidden Dam on Hensley Lake and from water from the Madera Canal which originates from Millerton Lake. Water supplies could be
from the Central Valley Project (CVP) Friant Division, Fresno River, or pre-1914 supplies. Water supplies without existing approvals would require future action for environmental compliance.
The Project entails the installation of a siphon in Madera Lake, siphon inlet channel, booster pump, pipelines, sump and grower turnout to obtain a flowrate of up to 8,000 gpm from Madera Lake, with up to 6,000 gpm delivered into MWD and up to 2,000 gpm delivered to the neighboring grower property from MID or other outside water supplies. Construction may be phased with the work within the Madera Lake property and sump at the siphon terminus being constructed first and the remaining facilities constructed later.
A 26 to 30-inch steel siphon pipe would be supported by a continuous concrete footing constructed on the lakebed below the normal water surface. A small inlet channel would be constructed in the lakebed to direct flows to the siphon at low lake levels. Once above the normal water surface, the steel pipeline would be installed
on concrete saddles on the dam embankment side slopes, and buried through the top of the existing dam embankment/roadway. Upon reaching the existing dirt farm road west of Madera Lake, the siphon pipe would be buried three to four feet and then terminate at a sump with booster pump(s). Up to six orchard trees may requite removal to facilitate construction of the sump /booster pump and associated electrical service.
The booster pump(s) at the siphon outlet sump will discharge into a 27-inch buried plastic pipeline that will then continue to traverse westerly between orchard rows for about 2,600 feet where the pipeline will continue in a northerly direction within the existing farm road for about 1,530 feet where a landowner turnout will be installed to serve orchard lands. After the landowner turnout, the pipeline will transition to a 24-inch buried plastic pipe and continue north another approximately 4,160 feet until terminating at a new booster pump station discharging into the existing MWD distribution system near existing MWD Well #3 and reservoir at the northwest comer of the intersection of Avenue 19-’/2 and Road 29- ’/a alignments.
Construction of the improvements may be in phases. The inlet channel, siphon and booster pump sump are anticipated to be constructed in the initial phase, whereas the pumps and pipeline may be constructed at a later date.