PROJ01945 ‎(3)‎

• Contract/PO #: C150193
• Contractor Name: Dolores Water Conservancy District
• Contract Type: Loan
• Water District: 34
• County: Montezuma
• Loan Projects - Doc Type: Feasibility Study

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The pipelines will be sized using a velocity of 5 to 6 feet per second and 5.6 to 8.0 gpm per
irrigable acre served by the delivery system. The pipeliQ.es will have a minimum cover of 3 feet.
Air-vacuum valves will be installed at each high point along the pipelines. Friction loss values
for valves, bends and pipe lengths will be based on the manufacture's recommendations.
Imported material for pipe bedding is not required because the soil is a silty loam.

Pumps will be sized based on 5.6 to 8.0 gpm per irrigab1e acre and sufficient pump lift to provide
45 psi at the high point of the highest field. The pumping plants will be metal buildings with a
wet-well and a pumping gallery. The pumps will be flooded end suction centrifugal pumps sized
to deliver the desired head and quantity. A minimum of one of the pumps in each pumping plant
will have a variable frequency drive unit for efficiency and the capability of matching the
demand. Manufacturers pump efficiencies will be used in the design for the pumps. The
number of pumps will depend on the demand at each site. The optimum pump will be selected
for each location and, if necessary, trim the impeller to provide a close match for head
requirements.

A pressure tank will be installed at each pumping plant location to protect against water hammer.
For added protection a pressure reducing valve will be installed in the pipeline near the wet-well
which will relieve any extensive pressure build-up from water hammer or a pumping
malfunction.

Building footings will be designed for 150 pounds per linear foot. Pump bases will have a
minimum of 12-inch thick reinforced concrete for support and to prevent vibration. The
pumping plant sites will be drained to the nearest drainage way or back to the canal.

The inlet to the pumping plants will have an automatic water screen to remove debris from the
water since all delivery water will be for sprinkler irrigation. The motor control center and the
SCADA system will be positioned against an exterior wall. The wet-well and the pump gallery
will have metal grates over the area for safety which can be removed for maintenance. The
pump building will not be insulated but will be ventilated for summer use. The pumping
equipment within the facility will be drained each year in the winter to prevent freezing.

Each on-farm delivery box will have a pressure reducing valve (PRV), air vacuum valve, a flow
meter and two pressure gauges (one upstream and one downstream of the PRY). The delivery
boxes will be a concrete vault with an aluminum cover for access. The vault is approximately 6
feet wide, 10 feet long and 7 feet deep. There will be an isolation valve upstream and
downstream of each delivery box for equipment repair and winterizing.

The delivery boxes, pumping plants and pipelines will be drained and winterized to prevent
freezing during the off season..

XI.4 HYDROLOGY, OPERATION STUDIES, AND WATER RIGHTS
The Selected Plan will utilize the remaining water available from the 1,500 shares Oif MVIC
Class B Shares to irrigate 2,200 acres of land in the Yellow Jacket East and Pleasant View East
areas, This water has already been purchased through Contract #1 and is available when the
delivery facilities are completed.

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