C153773 Feasibility Study

• Contract/PO #: C153773
• Contractor Name: Morrison, Town of
• Contract Type: Loan
• Water District: 9
• County: Jefferson
• Bill Number: HB 95-1155
• Loan Projects - Doc Type: Feasibility Study

I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I

Fort and other development to the south. To stay within the normal pressure criteria, this second
zone should have a gradient (HWL) of approximately 6182 - with a service "blue line" of
approximately 6100 foot elevation. In order to serve a larger area with only one more zone, the
1971 Master Plan raised the tank some, and stretched the Blue Zone to elevation 6120.

Because of the desire to provide service to the Fort area and to Cooley, it is now recommended
that the higher pressure zone be raised to a 6200 Blue Line - which would require a tank high
water level of about 6290 feet. This is still substantially below the Cooley Reservoir level and
would accommodate the insertion of a higher water treatment plant supply point without
additional pumping.

The revised pressure zone/distribution plan is illustrated on Drawing IV-A. This plan provides
for a High Zone, having service elevations between 6200 and 6000. To increase present low
pressure in the higher areas of Morrison, and serve intervening areas, a small intermediate
pressure zone is proposed, reduced from the High Zone.

Service to Red Rocks Amphitheater
Morrison is negotiating with the City and County of Denver to provide water service to Red Rocks
Amphitheater. The amphitheater is located above the existing Morrison storage tank at elevation
6,400 feet, therefore a pump system would be required to supply water to the site.

Red Rocks Amphitheater hosts approximately 50 concerts per year during the summer months
of April through September. According to a report by WRC Engineering(23), water use is typically
30,000 gallons per event. A peak month may include up to 15 events. The peak monthly water
use is expected to be 450,000 gallons. It has been reported that Red Rocks Amphitheater park
has two storage tanks totaling at least 600,000 gallons which could theoretically support 20
concert events with no recharge. In the past, the tanks were filled with a spririg which often dries
up in the summer, a shallow well yielding approximately 8 gpm, and an infiltration gallery in
Mount Vernon Gulch. The water supply flow rate to the park in the past has been very low, and
with such a tremendous volume of storage, a feed rate of 10-15 gpm would be adequate to keep
the tank near full.

If Morrison contracts to provide the water supply to Red Rocks Amphitheater Park, Morrison
would be obligated to deliver an adequate supply of water to the Town limits. Two possible pipe
mains presently exist where the Park could connect for service: (1) the new 6-inch line on Stone
Street, or (2) an old 4-inch line passing up Bear Creek Lane and across Highway 74 to Red
Rocks Loop near the chapel. Due to age and corrosion, the 4-inch line would need replacement

70-0aO.035:MSTR-PLN

11I-20