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

Objectives: 1. Understand how MWELO will affect irrigation design 2. Learn the basic calculations required to comply with the Model Water Efficient Landscape Ordinance

Model Water Efficient Landscape Ordinance Revised MWELO effective November 1, 2015 NPDES Permit requires compliance to MAWA SWMP Implementation and MWELO Compliance Memo **Issued Oct. 23, In advance of the Division of Environmental Analysis implementation memo, “Staff will calculate the MAWA and ETWU as defined by the MWELO for new (greater than 500 sq. feet)” or rehabilitated (greater than 2,500 sq. feet)” planting projects with permanent irrigation Enforced through: **Local agencies (per MWELO ordinance, enforces irrigation run-off) State Water Resource Control Board (enforces pollutants in run-off) 9 state-wide regional water boards Costly fines and penalties

Purpose of MWELO Promote the values and benefits of landscapes and use water as efficiently as possible Use water efficiently without waste by setting a Maximum Applied Water Allowance (MAWA) as an upper limit for water use and reduce water use to the lowest practical amount Encourage local agencies to designate the necessary authority that implements and enforces the provisions of the Model Water Efficient Landscape Ordinance or its local landscape ordinance

Statewide Water Purveyors

Landscape Documentation Package The Landscape Documentation Package includes the following six items: 1. Project Information 2. Water Efficient Landscape Worksheet

Exercise #1

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 (G) project contacts to include contact information for the project and/or property owner (CALTRANS, District “x”) (H) Licensed Landscape Architect signature and date (I) Include statement, “I agree to comply with the requirements of the water efficient landscape ordinance and submit a complete Landscape Documentation Package.”

Updated Project Information Effective November 1, 2015 the following statements must appear: The Irrigation plan statement must read: “I have complied with the criteria of the ordinance and applied them accordingly for the efficient use of water in the irrigation design plan.” The Planting plan statement must read: “I have complied with the criteria of the ordinance and applied them for the efficient use of water in the landscape design plan.” The Grading plan statement must read: “I have complied with the criteria of the ordinance and applied them accordingly for the efficient use of water in the grading design plan.”

Project Information

B/G C/G H “I agree to comply with the requirements of the water efficient landscape ordinance and submit a complete Landscape Documentation Package”. I A Project Information Check List: (A) Date (B) Project applicant- CALTRANS, District “x” (C) Project address (if available, parcel, route and post-mile limits) *(G) project contacts to include contact information for the project and/or property owner (CALTRANS, District “x”) (H) Licensed Landscape Architect signature and 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 Project Information Check List: (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 E &F

Landscape Documentation Package The Landscape Documentation Package includes the following six items: 1. Project Information 2. Water Efficient Landscape Worksheet

Water Efficient Landscape Worksheet The Water Efficient Landscape Worksheet contains two sections: 1. Hydrozone Information Table 2. Water Budget

Exercise #2 Hydrozone Information Table

Hydrozone Area (HA) Low Water Use (Bubblers) 80,000 sq. ft. Low Water Use (drip irrigation) 50,000 sq. ft. Moderate Water Use (spray heads) 4,700 sq. ft.

Exercise #2 Hydrozone Information Table

Plant Factor

Plant Selection List Plant Water Use TypePlant Factor (LW) Low Water (MW) Moderate Water (HW) High Water SLA 1.00

Exercise #2 Hydrozone Information Table

Water Efficient Landscape Worksheet The Water Efficient Landscape Worksheet contains two sections: 1. Hydrozone Information Table 2. Water Budget

Water Efficient Landscape Worksheet Water Budget Water Budget consists of two calculations: 1. Maximum Applied Water Allowance 2. Estimated Total Water Use

Exercise #3 Worksheet Maximum Applied Water Allowance MAWA =(ETo)(.62)x[( 0.4 x LA)+(0.6 x SLA)] Eto= Reference ET (inches per year).62 = Conversion factor to gallons *.40= ET Adjustment Factor(ETAF) for Landscape Areas (LA) *.60= 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) * The ET adjustment factors (ETAF) have been adjusted to reflect the revised Ordinance (June 12, 2015)

Reference ET (a.k.a: ETo) Can be obtained from the MWELO package MAWA =(51.3)(.62)x[(0.4 x LA)+(0.6 x SLA)] MAWA =(ETo)(.62)x[(0.4 x LA)+(0.6 x SLA)] Maximum Applied Water Allowance LOS ANGELES Burbank Claremont El Dorado

Water Efficient Landscape Worksheet Hydrozone Information Table MAWA =(51.25)(.62)x[(0.4 x 134,700)+(0.6 x 0)] Note: LA = Hydrozone Area (HA) MAWA =(51.25)(.62)x[(0.4 x LA)+(0.6 x SLA)]

Maximum Applied Water Allowance (MAWA) What is your MAWA? MAWA= 1,712,037 Gallons per year

Water Efficient Landscape Worksheet Water Budget Water Budget consists of two calculations: 1. Maximum Applied Water Allowance 2. Estimated Total Water Use

Exercise #4 Worksheet 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 IV or other DWR approved sources) HA= Hydrozone Area (plant groupings per watering need) IE= Irrigation Efficiency (based on sprinkler type) ** “The minimum average irrigation efficiency for purposes of this ordinance is 0.92.”

Zone 1: ETWU=(51.25)(.62)(40,000/0.92) Zone 2: ETWU=(51.25)(.62)(5,000/0.92) Zone 3: ETWU=(51.25)(.62)(3,760/0.92) ETWU=(ETo)(.62)(PF x HA/IE) *Claremont ETo= Water Efficient Landscape Worksheet Estimated Total Water Use(ETWU) ** IE= 0.92

Estimated Total Water Use(ETWU) What is your ETWU? ETWU=1,381,522 Gallons for Zone 1 ETWU=172,690 Gallons for Zone 2 ETWU=129,863 Gallons for Zone 3 ETWU= 1,684,075 Gallons per year

Maximum Applied Water Allowance (MAWA) MAWA= 1,712,037 gallons per year ETWU= 1,684,075 gallons per year The Water Budget complies with MAWA !

Project Information Suggested locations of MWELO Information

District Example

Water Efficient Landscape Ordinance Websites: Adoption of updated MWELO Letter: MWELO: Department of Water Resources (Water Efficient Landscape Ordinance): FAQ’s: Estimating Irrigation Water Needs for Landscape Plantings in California (Brochure): WUCOLS IV: Caltrans Storm Water Permit (Order # DWQ): ality/2012/wqo2012_0011_dwq.pdf

Thank You!