HomeMy WebLinkAboutWater Budget Calculator Example_3_07_24SECTION 2 - WATER BUDGET AREA CALCULATOR
The Water Budget Area is the Total Lot Area minus the Building Footprint, Hardscape (e.g. sidewalk, pavers, or driveway), Exemptions (e.g. edible gardens or retention ponds), and Artificial Plant Material areas.
Category Area (sq. ft.)
Total Lot Area 15,000
Building Footprint 2,000
Hardscape (e.g. sidewalk or
pavers)3,000
Exemptions (e.g. retention
pond)0
Artificial Plant Materials 0
Water Budget Area (sq. ft.)10,000
WATER BUDGET CALCULATORHydrozones are a portion of the landscaped area which has plants with similar water needs grouped together that are typically irrigated by one valve or station with the same irrigation type.
When different plant factors are grouped in one hydrozone, the highest plant factor determines the hydrozone water use category.
For example, 0.1 and 0.3 plant factor species hydrozoned together would be placed into the low, or 0.3, hydrozone water use category.
Bare mulch areas are included as part of its adjacent hydrozone to account for any future plantings in that area.
Section 2 Water Budget Calculator for all single household, townhome, duplex, triplex, or fourplex developments subject to BMC 38.230.060. Water budget not to exceed 10 gal/square foot.
Water Budget Area (sq. ft.)10,000
Hydrozone Water Use
Category
Plant Factor
(PF)Net ETo Irrigation
Type
Irrigation
Efficiency
Irrigation
gallons per
sq. ft.
Sq. Ft.Water Use
(gal)
Percent of Total
Water Budget
Area
Percent of Total
Irrigation Demand
High 0.8 26 Overhead 0.7 18.4 3,350 61,717 34%62%
Medium 0.6 26 Drip 0.9 10.7 - - 0%0%
Medium 0.6 26 Overhead 0.7 13.8 - - 0%0%
Low 0.3 26 Drip 0.9 5.4 6,650 35,733 67%36%
Very Low 0.1 26 Drip 0.9 1.8 - - 0%0%
N/A 0.1 26 N/A 0.9 1.8 - - 0%0%
Total Area 10,000
Tree Water Calculator
Tree Water Use
Category
Plant Factor
(PF)Net ETo Irrigation
Efficiency
Irrigation
gallons per
sq. ft.
Number of
Trees Sq. Ft.Water Use
(gal)
Percent of Total
Water Budget
Area
Percent of Total
Irrigation Demand
High 0.8 26 0.9 14.3 - - - 0%0%
Medium 0.6 26 0.9 10.7 1 28 301 0%0%
Low 0.3 26 0.9 5.4 12 336 1,805 3%2%
Very Low 0.1 26 0.9 1.8 - - - 0%0%
TOTAL WATER USE 99,556
GAL/SF (AVG)9.96
Not to exceed 10 GAL/SF.
Reference Tables
Plant Factor Reference Table*Irrigation Efficiency Table
Plant Type
Hydrozone
Water Use
Category
Selected
Plant Factor
(PF)
Irrigation
Type
Irrigation
Efficiency
Turfgrass cool season/water High 0.8 Overhead 0.7
Annual Flowers High 0.8 Drip 0.9
Warm season turfgrass Medium 0.6
Woody plants and herbacious pMedium 0.6
Drought adapted woody plants Low 0.3
Drought Tolerant Very Low 0.1
Existing non-irrigated landscapeN/A 0.1
*Refer to plant list for exact species plant factors.
SECTION 3 - WATER BUDGET AREA CALCULATORThe Water Budget Area is the Total Lot Area minus the Building Footprint, Hardscape (e.g. sidewalk, pavers, or driveway), Exemptions (e.g. edible gardens or retention ponds), and Artificial Plant Material areas.
Category Area (sq. ft.)
Total Lot Area 15,000Building Footprint 2,000Hardscape (e.g. sidewalk or
pavers)3,000
Exemptions (e.g. retention
pond)0
Artificial Plant Materials 0
Water Budget Area (sq. ft.)10,000
WATER BUDGET CALCULATORHydrozones are a portion of the landscaped area which has plants with similar water needs grouped together that are typically irrigated by one valve or station with the same irrigation type.
Section 3 Water Budget Calculator for developments subject to BMC 38.550.040 (e.g. plats, site plans, planned development zones). Water budget not to exceed 8 gal/square foot.
Water Budget Area (sq. ft.)10,000
Hydrozone Water Use
Category
Plant Factor
(PF)Net ETo Irrigation
Type
Irrigation
Efficiency
Irrigation
gallons per
sq. ft.
Sq. Ft.Water Use
(gal)
Percent of Total
Water Budget
Area
Percent of
Total
Irrigation DemandHigh0.8 26 Overhead 0.7 18.4 2,500 46,057 25%61%Medium 0.6 26 Drip 0.9 10.7 - - 0%0%
Medium 0.6 26 Overhead 0.7 13.8 - - 0%0%
Low 0.3 26 Drip 0.9 5.4 4,000 21,493 40%28%
Very Low 0.1 26 Drip 0.9 1.8 3,500 6,269 35%8%
N/A 0.1 26 N/A 0.9 1.8 - - 0%0%
Total Area 10,000
Tree Water Calculator
Tree Water Use
Category
Plant Factor
(PF)Net ETo Irrigation
Efficiency
Irrigation gallons per
sq. ft.
Number of
Trees Sq. Ft.Water Use
(gal)
Percent of Total Water Budget
Area
Percent of
Total
Irrigation
Demand
High 0.8 26 0.9 14.3 - - - 0%0%
Medium 0.6 26 0.9 10.7 1 28 301 0%0%
Low 0.3 26 0.9 5.4 12 336 1,805 3%2%
Very Low 0.1 26 0.9 1.8 - - - 0%0%
TOTAL WATER USE 75,926
GAL/SF (AVG)7.59
Not to exceed 8 GAL/SF.Reference TablesPlant Factor Reference Table*Irrigation Efficiency Table
Plant Type
Hydrozone
Water Use Category
Selected
Plant Factor (PF)
Irrigation
Type
Irrigation
Efficiency
Turfgrass cool season/water High 0.8 Overhead 0.7
Annual Flowers High 0.8 Drip 0.9
Warm season turfgrass Medium 0.6
Woody plants and herbacious
perennials Medium 0.6
Drought adapted woody
plants and herbacious perennials Low 0.3
Drought Tolerant Very Low 0.1
Existing non-irrigated landscape areas/areas with temporary irrigation only N/A
0.1
*Refer to plant list for exact species plant factors.
When different plant factors are grouped in one hydrozone, the highest plant factor determines the hydrozone water use category. For example, 0.1 and 0.3 plant factor species hydrozoned together would be placed into the low, or 0.3, hydrozone water use category.
Bare mulch areas are included as part of its adjacent hydrozone to account for any future plantings in that area.