Transcript MWELO Guidance (Updated 12-10-2015)

MODEL WATER
EFFICIENT
LANDSCAPE
ORDINANCE
GUIDANCE
NEW CHANGES TO THE MODEL WATER
EFFICIENT LANDSCAPE ORDINANCE
Effective December 1, 2015
New:
• New construction projects > 500 square feet.
• Rehabilitated landscape projects > 2,500 square feet.
• New Irrigation Efficiency for drip and overhead spray
• New ET Adjustment Factor (ETAF)
• New Turf restrictions
2
NEW CHANGES TO THE MODEL WATER
EFFICIENT LANDSCAPE ORDINANCE
Effective December 1, 2015
Revised:
• Revised Maximum Applied Water Allowance (MAWA) calculation
• Revised Estimated Total Use (ETWU) calculation
• Revised Soils test requirements
3
EXEMPT
• Landscape projects with a temporary
• New Landscape <500 square feet
• Rehabilitated Landscapes <2,500 square feet
• Registered local, state or federal historical sites
• Ecological restoration projects without permanent irrigation system
• Mined-land reclamation projects without permanent irrigation system
4
SIX ELEMENTS OF THE LANDSCAPE DESIGN
PACKAGE
Project
Information
Grading
Design Plan
Soils
Management
Report
5
Landscape
Design Plan
Irrigation Plan
Water
Efficient
Landscape
Worksheet
MOST AFFECTED ELEMENTS OF THE
LANDSCAPE DESIGN PACKAGE
6
IRRIGATION
PLAN
WATER
EFFICIENT
LANDSCAPE
WORKSHEET
GRADING
PLAN
LANDSCAPE
DESIGN
PLAN
REQUIREMENTS ON THE IRRIGATION PLAN
“I have complied with the criteria of
the ordinance and applied them
accordingly for the efficient use of
water in the irrigation design plan.”
IRRIGATION
PLAN
GRADING
PLAN
7
WATER
EFFICIENT
LANDSCAPE
WORKSHEET
LANDSCAPE
DESIGN PLAN
REQUIREMENTS ON THE IRRIGATION PLAN
• Irrigation efficiencies are 0.75 for
overhead spray devices and 0.81 for
drip systems.
• Master valves, flow sensors, rain
sensors and Smart controllers are
required.
• Overhead spray is prohibited within
24 inches of any non-permeable
surface
8
IRRIGATION
PLAN
GRADING
PLAN
WATER
EFFICIENT
LANDSCAPE
WORKSHEET
LANDSCAPE
DESIGN PLAN
REQUIREMENTS ON THE IRRIGATION PLAN
• A diagram of the irrigation plan
showing hydrozones shall be kept
with the irrigation controller for
subsequent management purposes.
• Check valves or anti-drain valves are
required where low point drainage
occurs.
IRRIGATION
PLAN
WATER
EFFICIENT
LANDSCAPE
WORKSHEET
• Provide Irrigation Schedule
GRADING
PLAN
9
LANDSCAPE
DESIGN PLAN
REQUIREMENTS ON THE WATER EFFICIENT
LANDSCAPE WORKSHEET
• Potable: MAWA
=(ETo)(.62)x[(ETAF x
LA)
• Recycled: MAWA
=(ETo)(.62)x[(ETAF x
LA)+((1-ETAF) x SLA)]
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IRRIGATION
PLAN
GRADING
PLAN
WATER
EFFICIENT
LANDSCAPE
WORKSHEET
LANDSCAPE
DESIGN PLAN
EXAMPLE MAWA CALCULATION
• Given:
A landscape project in Fresno, CA consists of 50,000
square feet of irrigated landscape without any Special
Landscape Area (SLA). The ET for Fresno is 51.1
inches.
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EXAMPLE MAWA CALCULATION
• MAWA =(ETo)(.62)x[(ETAF x LA)
• 0.45 is new ETAF (ET adjustment factor)
Reference Evapotranspiration (ETo)
51.1 (Fresno)
ETWU
ETWU
ETWU
ETWU
MAWA
ETWU
requirement requirement requirement requirement requirement
requirement
Hydrozone#/Planting
Plant Factor Irrigation
Irrigation
Landscape Area
Estimated Total
Description
(PF)
Method
Efficiency (IE) ETAF (PF/IE) (LA) (sq. ft.)
ETAF x Area
Water Use (ETWU)
Regular Landscape Areas
1) very low water use plants
0 drip
0
0.00
20,000
0
0
2) low water use plants
0 drip
0
0.00
10,000
0
0
3) moderate water use plants
0 overhead
0
0.00
20,000
0
0
Totals
0.00
50,000
0
0
Special Landscape Areas (SLA)
low water use plants
1
0
0
0
medium water use plants
1
0
0
0
medium water use plants
1
0
0
0
Totals
0
0
0
Estimated Total Water Use (ETWU) in gallons
0
Maximum Applied Water Allowance (MAWA) in Gallons
712,845
12
REQUIREMENTS ON THE WATER EFFICIENT
LANDSCAPE WORKSHEET
Revised Estimated Total Water Use
(ETWU) Calculations:
• Potable: ETWU= (ETo)(0.62) x
(ETAF x Area)
IRRIGATION
PLAN
GRADING
PLAN
13
WATER
EFFICIENT
LANDSCAPE
WORKSHEET
LANDSCAPE
DESIGN PLAN
EXAMPLE ETWU CALCULATION
• Given:
Planting consists of three planting zones.
Zone 1 =plant factor of 0.1, and has an irrigation efficiency of 0.81.
Zone 2 =plant factor of 0.2, and has an irrigation efficiency of 0.81.
Zone 3 =plant factor of 0.6, and has an irrigation efficiency of 0.75.
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EXAMPLE ETWU CALCULATION
Reference Evapotranspiration (ETo)
51.1 (Fresno)
ETWU
ETWU
ETWU
ETWU
MAWA
ETWU
requirement requirement requirement requirement requirement
requirement
Hydrozone#/Planting
Plant Factor Irrigation
Irrigation
Landscape Area
Estimated Total
Description
(PF)
Method
Efficiency (IE) ETAF (PF/IE) (LA) (sq. ft.)
ETAF x Area
Water Use (ETWU)
Regular Landscape Areas
1) very low water use plants
0.1 drip
0.81
0.123
20,000
2,469.14
78,227
2) low water use plants
0.2 drip
0.81
0.247
10,000
2,469.14
78,227
3) moderate water use plants
0.6 overhead
0.75
0.800
20,000
16,000.00
506,912
Totals
50,000
20,938.27
663,366
Special Landscape Areas (SLA)
low water use plants
1
0
0
0
medium water use plants
1
0
0
0
medium water use plants
1
0
0
0
Totals
0
0
0
Estimated Total Water Use (ETWU) in gallons
663,366
Maximum Applied Water Allowance (MAWA) in Gallons
712,845
15
MWELO COMPLIANCE
RESULTS:
• MAWA=712,845 gallons
• ETWU=663,366 gallons
PROJECT COMPLIES WITH THE ORDINANCE!
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REQUIREMENTS ON THE LANDSCAPE DESIGN
PLAN
Landscape planting plans require
the following statement on the
first sheet of the set of plans:
“I have complied with the criteria
of the ordinance and applied them
accordingly for the efficient use of
water in the landscape design
plan.”
IRRIGATION
PLAN
GRADING
PLAN
17
WATER
EFFICIENT
LANDSCAPE
WORKSHEET
LANDSCAPE
DESIGN
PLAN
REQUIREMENTS ON THE LANDSCAPE DESIGN
PLAN
• Turf is prohibited in street
medians.
• Areas less than ten feet shall be
irrigated with subsurface
irrigation
• Soil prep shall be transformed to
a friable condition
• No turf in slopes >25% (4:1)
• High water use plants (plant
factor of 0.7-1.0) are prohibited
in street medians.
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IRRIGATION
PLAN
GRADING
PLAN
WATER
EFFICIENT
LANDSCAPE
WORKSHEET
LANDSCAPE
DESIGN
PLAN
REQUIREMENTS ON THE LANDSCAPE DESIGN
PLAN
• Soil amendments shall be
incorporated according to
recommendations of the soil
report
• Install compost at a (min) rate of
4 cubic yards per 1,000 square
feet of permeable area
• 3” (min) layer of mulch shall be
applied on all exposed soil
surfaces.
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IRRIGATION
PLAN
GRADING
PLAN
WATER
EFFICIENT
LANDSCAPE
WORKSHEET
LANDSCAPE
DESIGN
PLAN
REQUIREMENTS ON THE GRADING PLAN
Grading plans require the
following statement on the first
sheet of the set of plans:
“I have complied with the criteria
of the ordinance and applied them
accordingly for the efficient use of
water in the grading design plan.”
IRRIGATION
PLAN
GRADING
PLAN
20
WATER
EFFICIENT
LANDSCAPE
WORKSHEET
LANDSCAPE
DESIGN PLAN
MOST AFFECTED ELEMENTS OF THE
LANDSCAPE DESIGN PACKAGE
21
IRRIGATION
PLAN
WATER
EFFICIENT
LANDSCAPE
WORKSHEET
GRADING
PLAN
LANDSCAPE
DESIGN
PLAN
NEW CHANGES TO THE MODEL WATER
EFFICIENT LANDSCAPE ORDINANCE
Effective December 1, 2015
Revised:
• Revised Maximum Applied Water Allowance (MAWA) calculation
• Revised Estimated Total Use (ETWU) calculation
• Revised Soils test requirements
22
NEW CHANGES TO THE MODEL WATER
EFFICIENT LANDSCAPE ORDINANCE
Effective December 1, 2015
New:
• New construction projects > 500 square feet.
• Rehabilitated landscape projects > 2,500 square feet.
• New Irrigation Efficiency for drip and overhead spray
• New ET Adjustment Factor (ETAF)
• New Turf restrictions
23
EXEMPT
• Landscape projects with a temporary
• New Landscape <500 square feet
• Rehabilitated Landscapes <2,500 square feet
• Registered local, state or federal historical sites
• Ecological restoration projects without permanent irrigation system
• Mined-land reclamation projects without permanent irrigation system
24
THANK YOU
MODEL WATER
EFFICIENT
LANDSCAPE
ORDINANCE