Model Water Efficient Landscape Ordinance (MWELO)

Goal and Objectives:

Goal: Provide information on the Model Water Efficient Landscape Ordinance (MWELO) and how to implement it on your projects.

Objectives:The Academy Trainee will:1. Understand how MWELO will affect irrigation design2. Learn the basic calculations required to comply with

the Model Water Efficient Landscape Ordinance

DROUGHT EMERGEN

CY

“State agencies, led by the Department of General Services, will immediately implement water use reduction plans for all state facilities.”

“Maintenance forces will immediately implement actions to reduce irrigation use by 50%.”

Model Water Efficient Landscape Ordinance

Effective January 1, 2010 NPDES Permit requires compliance to

MAWA Enforced through:

State Water Resource Control Board Local agencies

Model Water Efficient Landscape Ordinance

Requires: Landscape Documentation Package

New and rehabilitated Irrigated landscapes of 2,500 sq. ft. or more

Landscape Documentation Package

The Landscape Documentation Package includes, but not limited to:

Project Information Maximum Annual Water Allowance (MAWA) Hydrozone Information table Estimated Total Water Use (ETWU) calculations

Project Information

(A) Date (B) Project applicant- CALTRANS, District

“x”) (C) Project address (if available, parcel ,

route and post-mile limits) (D) Total landscape area (square feet) (E) Project type (e.g., new, rehabilitated) (F) Water supply type (e.g., potable,

recycled, well) and identify the local retail water purveyor if not served by a private well

Project Information

(G) project contacts to include contact information for the project and/or property owner (CALTRANS, District “x”)

(H) Licensed Landscape Architect signatureand date

(I) Include statement, “I agree to comply with the requirements of the water efficient landscape ordinance and submit a complete Landscape Documentation Package”.

Project Information

“I agree to comply with the requirements of the water efficient landscape ordinance and submit a complete Landscape Documentation Package”. “I agree to comply with the requirements of

the water efficient landscape ordinance and submit a complete Landscape Documentation Package”.

Landscape Documentation Package

The Landscape Documentation Package includes, but not limited to:

Project Information Maximum Annual Water Allowance (MAWA) Estimated Total Water Use (ETWU) calculations

and Hydrozone Information table

Maximum Annual Water Allowance

MAWA =(ETo)(.62)x[(0.7 x LA)+(0.3 x SLA)]

•Eto= Reference ET (inches per year)•.62 = Conversion factor to gallons•.70= ET Adjustment (ETA) factor for Landscape Areas (LA)•.30= ET Adjustment Factor (ETAF) for Special Landscape Areas (SLA)•SLA= Special Landscape Area in square feet. This consists of planted areas irrigated with recycled water or water features using recycled water)

Maximum Annual Water Allowance

Reference ET (a.k.a: Eto)•Can be obtained from local weather stations like CIMIS

Number Name Region

82 Claremont Los Angeles Basin

Stn Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total

82 2.00 2.28 3.43 4.62 4.99 6.04 6.98 6.97 5.27 3.96 2.65 2.06 51.2

5

What is the total square footage of your Landscape Area (LA)?

134,700 Sq. Ft.

Maximum Annual Water Allowance (MAWA)

Results:   MAWA = (ETo) x (0.62) x [(0.7 x LA)+(0.3 x SLA)] 2,998,987.74 Gallons  400,906.35 Cubic Feet  4,009.58 HCF  9.22 Acre-feet

  3.00 Millions of Gallons

Landscape Documentation Package

The Landscape Documentation Package includes, but not limited to:

Project Information Maximum Annual Water Allowance (MAWA) Estimated Total Water Use (ETWU) calculations

and Hydrozone Information table

Estimated Total Water Use(ETWU)

ETWU=(Eto)(.62)(PF x HA/IE)

• Eto= Reference ET (Claremont,51.3)• .62 = Conversion factor to gallons• PF= Plant Factor (per WULCOLS III or IV)• HA= Hydrozone Area (plant groupings per

watering need)• IE= Irrigation Efficiency (based on

sprinkler type)

Identify the Hydrozone Area (HA)

Phase II:

12

3

Hydrozone Information Table

Hydrozone* Plant TypePF (Plant Factor) Zone

Irrigation Method**

HA (Hydrozone Area) (Sq. Ft.)

MW Moderate Water Use Trees and Shrubs 0 1 R 80000LW Very Low Water Use Trees and Shrubs 0 2 D 50000HW High Water Use Shrubs and Groundcover 0 3 S 4700

Total 134,700* Hydrozone (WUCOLS IV; Zone 4, Claremont ) **Irrigation MethodHW = High Water Use Plants (Plant Factor 0.7-.9) MS = Micro-sprayMW = Moderate Water Use Plants (Plant Factor 0.4-0.6) S = SprayLW = Low Water Use Plants (Plant Factor .10-0.3) R = RotorVL =Very Low Water Use Plants (Plant Factor <.10) B= Bubbler

D= DripO = Other

Plant Selection

http://ucanr.edu/sites/WUCOLS/Plant_Search/

Plant Selection List

Plant Factor (PF)

Plant Water Use Type Plant Factor

Very Low   <.10

Low   0.1 - 0.3

Moderate   0.4 - 0.6

High   0.7 - 1.0

SLA   1.00

Hydrozone Information Table

Hydrozone* Plant TypePF (Plant Factor) Hydrozone

Irrigation Method**

HA (Hydrozone Area) (Sq. Ft.)

PF x HA (Sq. Ft.)

MW Moderate Water Use Trees and Shrubs 0.5 1 R 80000 40,000LW Very Low Trees and Shrubs 0.1 2 D 50000 5,000HW High Water Use Shrubs and Groundcover 0.8 3 S 4700 3,760

Total 134,700 48,760* Hydrozone (WUCOLS IV; Zone 4, Claremont ) **Irrigation MethodVL =Very Low Water Use Plants (Plant Factor <.10) S = SprayLW = Low Water Use Plants (Plant Factor .10-0.3) R = RotorMW = Moderate Water Use Plants (Plant Factor 0.4-0.6) B= BubblerHW = High Water Use Plants (Plant Factor 0.7-.9) D= Drip

O = Other

Estimated Total Water Use(ETWU)

ETWU=(Eto)(.62)(PF x HA/IE)

• Eto= Reference ET (inches per year)• .62 = Conversion factor to gallons• PF= Plant Factor (per WULCOLS III or IV)• HA= Hydrozone Area (plant groupings per

watering need)• IE= Irrigation Efficiency (based on

sprinkler type)

Determine Irrigation Efficiency (IE)

Estimated Sprinkler head Irrigation Efficiency (IE)

Gear Rotor systems: .60-.80 (Verify efficiency with manufacturer)

Bubbler/Drip Emitters: .80-.90

Overhead fixed spray .60-.70 (Not Efficient)

Stream Spray .70-.80 (Verify efficiency with manufacturer)

Estimated Total Water Use(ETWU)

ETWU=(Eto)(.62)[(PF x HA/IE)+ SLA] Eto= 51.3 (Claremont) .62 = Conversion factor to gallons

Hydrozone* Plant TypePF (Plant Factor) Hydrozone

Irrigation Method**

HA (Hydrozone Area) (Sq. Ft.)

PF x HA (Sq. Ft.)

MW Moderate Water Use Trees and Shrubs 0.5 1 R 80000 40,000LW Very Low Trees and Shrubs 0.1 2 D 50000 5,000HW High Water Use Shrubs and Groundcover 0.8 3 S 4700 3,760

Total 134,700 48,760* Hydrozone (WUCOLS IV; Zone 4, Claremont ) **Irrigation MethodVL =Very Low Water Use Plants (Plant Factor <.10) S = Spray; IE=0.65LW = Low Water Use Plants (Plant Factor .10-0.3) R = Rotor; IE=.75MW = Moderate Water Use Plants (Plant Factor 0.4-0.6) B= BubblerHW = High Water Use Plants (Plant Factor 0.7-.9) D= Drip; IE=0.85

O = Other

Estimated Total Water Use(ETWU)

ETWU for Hydrozone 1:ETWU=(Eto)(.62)(PF x HA/IE) IE= .75(Rotors)

Hydrozone

Plant Water Use Type (s) (low, medium, high) Plant Factor (PF)

Hydrozone Area (HA) (ft2) PF x HA (ft2)

1 Moderate 0.50 80,000 40,000

ETWU=(Eto)(.62)(PF x HA/IE)ETWU=(51.3)(.62)(.5 x 80,000/.75)ETWU=(51.3)(.62)(40,000 /.75)ETWU=(51.3)(.62)(53,333)ETWU=1,696,320 Gallons for Hydrozone 1

Estimated Total Water Use(ETWU)

ETWU for Hydrozone 2:ETWU=(Eto)(.62)(PF x HA/IE) IE= .85(Drip)

Hydrozone

Plant Water Use Type (s) (low, medium, high) Plant Factor (PF)

Hydrozone Area (HA) (ft2) PF x HA (ft2)

2 Very Low 0.10 50,000 5,000

ETWU=(Eto)(.62)(PF x HA/IE)ETWU=(51.3)(.62)(.1 x 50,000/.85)ETWU=(51.3)(.62)(5,000 /.85)ETWU=(51.3)(.62)(5882)ETWU=187,094 Gallons for Hydrozone 2

Estimated Total Water Use(ETWU)

ETWU for Hydrozone 23:ETWU=(Eto)(.62)(PF x HA/IE) IE= .65(Spray)

Hydrozone

Plant Water Use Type (s) (low, medium, high) Plant Factor (PF)

Hydrozone Area (HA) (ft2) PF x HA (ft2)

3 High 0.80 4,700 3,760

ETWU=(Eto)(.62)(PF x HA/IE)ETWU=(51.3)(.62)(.8 x 4,700/.65)ETWU=(51.3)(.62)(3,760 /.65)ETWU=(51.3)(.62)(5785)ETWU=183,998 Gallons for Hydrozone 3

Estimated Total Water Use(ETWU) What is your ETWU?

ETWU=1,696,320 Gallons for Hydrozone 1

ETWU=187,094 Gallons for Hydrozone 2

ETWU=183,998 Gallons for Hydrozone 3

ETWU Total= 2,067,412 Gallons per year

Maximum Annual Water Allowance (MAWA)

MAWA= 2,999,365 gallons per year

ETWU= 2,067,412 gallons per year

The Water Budget complies with MAWA !

Water Efficient Landscape Ordinance Websites:

Adoption of updated MWELO Letter:http://www.water.ca.gov/wateruseefficiency/docs/DirectorLetterAdoption.pdfMWELO:http://www.water.ca.gov/wateruseefficiency/docs/MWELO09-10-09.pdfDepartment of Water Resources (Water Efficient Landscape Ordinance):http://www.water.ca.gov/wateruseefficiency/landscapeordinance/FAQ’s:http://www.water.ca.gov/wateruseefficiency/landscapeordinance/faq.cfmEstimating Irrigation Water Needs for Landscape Plantings in California (Brochure):http://www.water.ca.gov/wateruseefficiency/docs/wucols00.pdfWUCOLS IV:http://ucanr.edu/sites/WUCOLS/Caltrans Storm Water Permit (Order #2012-0011-DWQ):http://www.waterboards.ca.gov/board_decisions/adopted_orders/water_quality/2012/wqo2012_0011_dwq.pdf