HomeMy WebLinkAboutBURNS ANNEXATION AND ZONING - 23 90, A - CORRESPONDENCE - CITY STAFF (3)DATE:
TO:
FROM:
RE:
Utifity solces
Water &- Wastewater
October 8, 1990
MEMORANDUM
Kirsten Whetstone, City Planner
Roger Buffingta��ystems Engineer
Burns Ranch at Quail Ridge
The revised layout of Burns Ranch at Quail Ridge (Stamped 10/1/90) has been
reviewed with regard to the feasibility of providing water service from the
City's existing Foothills Pressure Zone. This review has included additional
water distribution system analyses to determine the resulting water system
pressures under various conditions at the elevations shown for the proposed
development.
The hydraulic analyses which was completed in this study was based upon the
following assumptions:
1. Ground elevation on Lot 14 is 5210.
2. Elevation of second floor water fixtures is approximately 5225.
3. Water usage within the residence i.s 10 gpm.
4. Water service to the residence and the 'interior plumbing is 1-inch
diameter. (In all probability, some of the piping would be smaller
than 1-inch; however, for simplicity, 1-inch was used for
everything.)
The water service was added to the analysis to more realistically approximate.
the pressures which would be observed within the plumbing system inside the.
house. Even though this refinement has been added, other hydraulic losses
from plumbing fittings, fixtures and appliances will cause the water pressure
to be lower than that indicated by the results from the hydraulic analysis.
P.O. Bo.x 380 • Fort Collins, CO ti052-)_Oh U • (303) 221_6081
Burns Ranch at Quail Ridge
October 8, 1990
Page 2 of 2
The following table summarizes the water pressures obtained from the analyses
which was based upon this information.
Typical Demand
Peak Hour Demand
Water Pressures at Elev. 5225
25.7 psi
17.1 psi
These pressures are not adequate for domestic water service.
A similar analysis was conducted for a residence with the highest finished
floor elevation at 5200. For a two=story house, this would relate to a ground
elevation of approximately 5185. The results are as follows:
Typical Demand
Peak Hour Demand
Water Pressures at Elev. 5200
36.5 psi
27.9 psi
These pressures are marginal for domestic water service.
As explained in an earlier memo regarding this development, the existing
Foothills Pressure Zone cannot adequately serve the subdivision which has been
proposed on the Burns property. If the City Water Utility is to serve this
subdivision, a third pressure zone would be required..
cc Rich Shannon
Mike Smith
Jim Hibbard
Tom Peterson
Ken Waido
Rex Burns