HomeMy WebLinkAbout04.04.11 Domestic & irrigation water storageCIVIL ENGINEERING
Attachment A
Individual Lot
Water Storage Requirements
LAND SURVEYING
April 4, 2011
HCE No. 2081021.00
COMBINED DOMESTIC AND IRRIGATION WATER STORAGE
All residential dwellings constructed on the lots must have appropriate domestic water
storage. The combined domestic water (drinking & irrigation) storage tank size is based on
figure of 100gal/person/day with the capacity to store enough water for 3 days, assuming a
maximum household population of 4 people per dwelling. Using these numbers we have
calculated a necessary storage volume of 1,200 gallons for in home use for each lot.
Each dwelling shall also have additional water storage for irrigation purposes. This storage
shall be contained in the same storage tank as the drinking water. The storage volume for
irrigation is also based on a 3 day supply. Calculations for storage were based off of a report
compiled by the Colorado Division of Water Resources. Based on 202,030 gal /acre of water
to irrigate bluegrass for a season, each lot will irrigate up to 12,000 square feet or 0.275
acres. There are 210 days in the areas growing season which makes 962ga1 /day for 1 acre of
bluegrass. Having a 3 day supply in storage would require 2,886 gal /3 days for 1 acre. Using
12,000 square feet or 0.275 acres of home /garden or yard area form #4 in the Highline Ranch
Covenants the additional storage volume is 794 gallons.
Therefore each lot will have storage tank capable of storing 2,000 gallons of water for
combined domestic and irrigation use.
FIRE PROTECTION WATER STORAGE
All residential dwellings constructed on the lots shall have appropriate fire protection water
storage for their fire suppression systems. The storage shall have adequate capacity to supply
a minimum discharge density of 0.02 gallons per minute per square foot for a minimum
duration of 30 minutes. For dwellings less than 3,600 sq f a minimum of 2,100 l:lgns is
required to meet the NFPA 13D criteria per the Rifle Fire Protection District :, p,OQ [/ 140,,
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1517 Blake Avenue, Suite 101
Glenwood Springs, CO 81601
Telephone (970) 945 -8676 - Fax (970) 945 -2555
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High Country Engineering, Inc