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City of Aspen Water Efficient Landscaping Ordinance City of Aspen Parks and Recreation Dept.
Pre‐Submission Packet Completeness Review 585 Cemetery Lane
Aspen, CO 81611
WATER EFFICIENT LANDSCAPE WORKSHEET ‐‐ WATER BUDGET ANALYSIS 970‐920‐5582
Address:Contact Info:
CALCULATING GALLONS OF WATER NEEDED BY PLANT CATEGORY AND IRRIGATION TYPE
The specific irrigation water needs of each hydrozone in the design should be determined using the following formula and factors:
Where:
ETo = Reference Evapotranspiration in inches/season (May ‐ Sept.)
Re = Effective Precipitation in inches/season (May ‐ Sept.)27.4 inches/year
Irrigated Area = Hydrozone Area in Square Feet 17.1 gallons/square foot
Water Use Category Plant Factor Code 6.8 inches/year
Cool Season Turf 0.90 VH 4.2 gallons/square foot
High 0.80 H
Medium 0.65 M
Low 0.40 L Irrigation Method Default Efficiency
Very Low 0.25 VL Overhead 75%
Drip 90%
HYDROZONE WATER BUDGET CALCULATION
Complete the hydrozone table for each hydrozone. Use as many rows as necessary to provide the square footage of landscape are per hydrozone.
Hydrozone Area Plant Water Need
(Sq. Ft.) (gal/season)
A1 Overhead 571 8471
A3, A5 Overhead 1286 11761
A4 Drip 10 29
A6 Drip 706 2033
A7, A8 Overhead 1435 13124
A11 Drip 10 29
A9, A10, A12, A13 Overhead 4767 70722
A14 Drip 1164 3352
A15 Overhead 588 5378
A17 Drip 63 779
A18 Drip 156 449
TOTAL 10756 116127
10.8
448 Sq. Ft. A2, A16
Sq. Ft.
Note: Project Applicant must complete this worksheet as it is a required element of the Landscape & Irrigation Documentation Package.
1350 Mountain View Drive, Aspen, CO 81611 Jane Lanter, Lift Studio: 970.404.5205
Directions for Use
Fill in these blue sections below. Some
columns have drop down menus to assist
you in filling out. The formulas will
calculate the site average annual water
use. Once completed you may either
attach this document to the submital
packet or insert it into the design set.
Irrigation Water Budget = [(ETo x Plant Factor) ‐ Re] x Irrigated Area + Irrigation Efficiency x 0.623
Reference Evapotranspiration
Hydrozones Efficiency Effective Precipitation
Irrigation Efficiency
Hydrozone Plant Water Use Type(s) Plant Factor Irrigation Method Irrigation Efficiency
VH 0.90 0.75
M 0.65 0.75
L 0.40 0.90
L 0.40 0.90
L 0.40 0.90
M 0.65 0.75
VH 0.90 0.75
L 0.40 0.90
M 0.65 0.75
Total area of irrigated public right‐of‐way:
Total area of non‐irrigated landscape:
AVERAGE IRRIGATION WATER NEED ‐ ALL ZONES* ‐ In gallons/sq. ft./season
* The average must be less than the Maximum Applied Water Budget of 7.5 gallons/sq.ft./season.
VH 0.90 0.90
L 0.40 0.90
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