Chapter 15.30
WATER EFFICIENT LANDSCAPE
Sections:
15.30.010 Purpose and findings.
15.30.040 Landscape design plan.
15.30.050 Irrigation design plan.
15.30.060 Documentation for compliance.
15.30.090 Provisions for appeal.
15.30.010 Purpose and findings.
A. The state legislature has found:
1. That the waters of the state are of limited supply and are subject to ever increasing demands;
2. That the continuation of California’s economic prosperity is dependent on the availability of adequate supplies of water for future uses;
3. That it is the policy of the state to promote the conservation and efficient use of water and to prevent the waste of this valuable resource;
4. That landscapes are essential to the quality of life in California by providing areas for active and passive recreation and as an enhancement to the environment by cleaning air and water, preventing erosion, offering fire protection, and replacing ecosystems lost to development;
5. That landscape design, installation, maintenance and management can and should be water efficient; and
6. That Section 2 of Article X of the California Constitution specifies that the right to use water is limited to the amount reasonably required for the beneficial use to be served and the right does not and shall not extend to waste or unreasonable method of use.
B. Consistent with these legislative findings, the purpose of this chapter is to protect local water supplies through the implementation of a whole systems approach to design, construction, installation and maintenance of the landscape resulting in water-conserving, climate-appropriate landscapes, improved water quality and the minimization of natural resource inputs. (Ord. 674-2010 (part), 2010)
15.30.020 Applicability.
A. After January 1, 2010, this chapter shall apply to all of the following landscape projects:
1. All new construction and rehabilitated landscapes for public agency projects and private development projects requiring a building permit, plan check or design review with a landscape area of two thousand five hundred square feet or more.
2. Approved projects which have not yet been submitted for initial plan check of improvement plans and which involve new construction or rehabilitation of landscape areas of two thousand five hundred square feet or greater in area.
B. This chapter does not apply to:
1. Registered local, state or federal historical landscape areas;
2. Ecological restoration or mined land reclamation projects that do not require a permanent irrigation system;
3. Plant collections, as part of botanical gardens and arboretums open to the public. (Ord. 674-2010 (part), 2010)
15.30.030 Definitions.
The terms used in this chapter have the meanings set forth in this section:
“Backflow prevention device” means an approved device installed to city standards which will prevent backflow or back-siphonage into the city’s potable water system.
“Booster pump” means a pump used where the normal water system pressure is low and needs to be increased.
“Check valve” means a valve located under a sprinkler head or other location in the irrigation system that holds water in the system and prevents drainage from sprinkler heads when the irrigation system is off.
“Common interest development” means community apartment projects, condominium projects, planned developments, and stock cooperatives per California Civil Code Section 1351.
“Compost” means the product resulting from the controlled biological decomposition of organic material that has been sanitized through the generation of heat and stabilized to the point that it is beneficial to plant growth. Compost contains plant nutrients and has the unique ability to improve the chemical, physical, and biological characteristics of soils.
“Ecological restoration project” means a project where the site is intentionally altered to establish a defined, indigenous, historic ecosystem.
“Effective precipitation” means the portion of total precipitation which becomes available for plant growth and that is used by the plants.
“Emitter” means a drip irrigation fittings emission device that delivers water slowly from the system to the soil.
“ET adjustment factor” means a factor of 0.7 that, when applied to reference evapotranspiration, adjusts for plant factors and irrigation efficiency, two major influences upon the amount of water that needs to be applied to the landscape, unless Tier 1, Section A5.304.4.1 of Title 24, Part 11 of the California Code of Regulations, otherwise applies, in which case the ET adjustment factor shall be based on the formula set forth therein.
“Evapotranspiration rate” means the quantity of water loss to the atmosphere by the combined processes of evaporation (from soil and plant surfaces) and transpiration (from plant tissues) during a specified time, usually expressed in inches of water per unit of time.
“Flow rate” means the rate at which water flows through pipes, valves, and emission devices; measured in gallons per minute, gallons per hour, or cubic feet per second.
“Hardscapes” means any durable material (pervious and nonpervious).
“Head to head coverage” means full spray coverage from one sprinkler head to the next.
“High-flow sensor” means a device for sensing the rate of fluid flow.
“High-water-use plants” means turf, annuals, container plantings, and other plants recognized as high-water-use by the Water Use Classification of Landscape Species document (http://www.owue.water.ca.gov/docs/wucols00.pdf), as it currently exists or may be amended in the future.
“Hydrozone” means a portion of the landscaped area having plants with similar water needs that are served by a valve or set of valves with the same schedule.
“Infiltration rate” means the rate of water entry into the soil expressed as a depth of water per unit of time (e.g., inches per hour).
“Invasive plant species” means species of plants not historically found in California and/or that spread outside cultivated areas and can damage environmental or economic resources as determined by the California Invasive Plant Council (www.cal-ipc.org).
“Irrigation efficiency (IE)” means the measurement of the amount of water beneficially used divided by the amount of water applied. Irrigation efficiency is derived from measurements and estimates of irrigation system characteristics and management practices. The minimum average irrigation efficiency for purposes of this chapter is 0.71.
“Irrigation meter” means a separate meter that measures the amount of water used for items such as lawns, washing exterior surfaces, washing vehicles, filling pools, etc.
“Isolation valves” means valves used to isolate a portion of the piping system.
“Landscaped area” means the entire parcel less the building footprint, driveways, and nonirri-gated portions of parking lots, hardscapes such as decks and patios, and other nonporous areas. Water features are included in the calculation of the landscaped area. Areas dedicated to edible plants, such as orchards or vegetable gardens, are not included. The landscape area does not include footprints of buildings or structures, sidewalks, driveways, parking lots, decks, patios, gravel or stone walks, other pervious or nonpervious hardscapes, and other nonirrigated areas designated for nondevelopment (e.g., open spaces and existing native vegetation).
“Lateral line” means nonpressurized pipe that is located downstream of an irrigation valve (Class 200 or equivalent is not acceptable).
“Low-head drainage” means water that flows out of the system after the valve turns off due to elevation changes within the system.
“Low-water-use plants” means Mediterranean region and California native trees, shrubs and groundcovers such as rosemary, juniper, most native oaks, and other plants recognized as low-water-use by the Water Use Classification of Landscape Species document (http://www.owue.water.ca.gov/docs/wucols00.pdf), as it currently exists or may be amended in the future.
“Main line” means the pressurized pipeline that delivers water from the water source to the valve or outlet.
“Maximum applied water allowance (MAWA)” means, for design purposes, the upper limit of annual applied water for the established landscape. It is based upon the area’s reference evapotranspiration, the ET adjustment factor, and the size of the landscape area.
“Microclimate” means the climate of a small, specific area that may contrast with the climate of the overall landscape area due to factors such as wind, sun exposure, plant density or proximity to reflective surfaces.
“Mined-land reclamation projects” means any surface mining operation with a reclamation plan approved in accordance with the Surface Mining and Reclamation Act of 1975.
“Moderate-water-use plants” means ornamental trees, shrubs, ground covers, and other plants recognized as moderate-water-use by the Water Use Classification of Landscape Species document (http://www.owue.water.ca.gov/docs/wucols00.pdf), as it currently exists or may be amended in the future.
“Mulch” means any organic material such as leaves, bark, straw, compost or inorganic mineral materials such as rocks, gravel, and decomposed granite left loose and applied to the soil surface for the beneficial purposes of reducing evaporation, suppressing weeds, moderating soil temperature and preventing soil erosion.
“Operating pressure” means the pressure at which the parts of an irrigation system are designed by the manufacturer to operate, usually indicated at the base of the sprinkler.
“Overhead irrigation” means those systems that deliver water through the air (e.g., pop-ups, impulse sprinklers, spray heads, rotors, micro-sprays, etc.).
“Overspray” means any irrigation water which is delivered beyond the landscaped target area; wetting pavements, walks, structures, or other nonlandscaped areas.
“Pervious” means any surface or material that allows the passage of water through the material and into the underlying soil.
“Plant factor” means a factor that, when multiplied by reference evapotranspiration (ETo), estimates the amount of water used by plants. Plant factors cited in this chapter are derived from the Department of Water Resources 2000 publication, “Water Use Classification of Landscape Species.”
“Point of connection” means the point at which an irrigation system taps into the main water supply line.
“Point source irrigation” means any nonspray low-volume irrigation system utilizing emission devices with a flow rate measured in gallons per hour. Low-volume irrigation systems are specifically designed to apply small volumes of water slowly at or near the root zone of plants.
“Precipitation rate” means the rate of application of water measured in inches per hour.
“Pressure regulation” means a device or valve that automatically reduces the pressure in a pipe.
“Project applicant” means the individual or entity submitting a landscape documentation package, to request a permit, plan check or design review from the local agency. A project applicant may be the property owner or his or her designee.
“Rain sensor” means an irrigation system component which automatically shuts off and suspends the irrigation system when it rains.
“Recreational area” means areas dedicated to active play or recreation such as sports fields, school yards, picnic grounds, golf courses, or other areas with intense foot traffic where turf provides a playing surface.
“Recycled water” means tertiary treated water, which results from the treatment of wastewater, and which conforms to the definition of disinfected tertiary recycled water in accordance with state law. Recycled water is suitable for nonpotable direct beneficial uses such as landscape irrigation and water features.
“Referenced evapotranspiration (ETo)” means the estimated rate of evapotranspiration from a standard surface of well watered, actively growing cool-season turfgrass clipped to twelve centimeters with sufficient density to fully shade the soil. The water needs of a landscape planting can be calculated by multiplying the landscape coefficient (KI) (as KI is defined in Section A4.302 of Title 24, Part 11 of the California Code of Regulations, as amended from time to time), and referenced evapotranspiration (ETo).
“Rehabilitated landscape” means any re-landscaping project that requires a building or grading permit, plan check or design review.
“Runoff” means water which is not absorbed by the soil or landscape to which it is applied and flows from the landscape area.
“Soils laboratory report” means the analysis of a soil sample to determine nutrient content, composition and other characteristics, including contaminants.
“Special landscape area (SLA)” means an area of the landscape dedicated solely to edible plants, areas irrigated with recycled water, water features using recycled water and areas dedicated to active play such as parks, sports fields, golf courses, and where turf provides a playing surface.
“Sprinkler head” means a device that delivers water to the landscape through a spray nozzle.
“Static water pressure” means the pipeline or municipal water supply pressure when water is not flowing.
“Station” means an area served by one valve or by a set of valves that operate simultaneously.
“Submeter” means a separate meter that is located on the private side of the water system and is plumbed to measure all water that flows only through the irrigation system. This meter is to be used by the owner to monitor irrigation water use and will not be read by the city.
“Swing joint” means an irrigation component that provides a flexible, leak-free connection between the emission device and lateral pipeline to allow movement in any direction and to prevent equipment damage.
“Valve” means a device used to control the flow of water in the irrigation system.
“Valve manifold” means a one-piece manifold for use in a sprinkler valve assembly that includes an intake pipe having a water inlet and a plurality of ports adapted for fluid connection to inlets.
“Water feature” means a design element where open water performs an aesthetic or recreational function. Water features include ponds, lakes, waterfalls, fountains, and artificial streams (where water is artificially supplied). “Water feature” does not include spas and swimming pools.
“Weather-based or sensor-based irrigation control technology” means an irrigation controller that uses local or historical weather data and site-specific landscape parameters to estimate or measure depletion of available plant soil moisture in order to operate an irrigation system, and make irrigation schedule adjustments, including run times and required cycles, throughout the irrigation season without human intervention.
“WUCOLS” means the Water Use Classification of Landscape Species published by the University of California Cooperative Extension, the Department of Water Resources and the Bureau of Reclamation, 2000. (Ord. 679-2011 § 1, 2011; Ord. 674-2010 (part), 2010)
15.30.040 Landscape design plan.
For each landscape project subject to this chapter, applicants shall submit a landscape design plan in accordance with the following:
A. Amendments, Mulching and Soil Conditioning.
1. A minimum of eight inches of nonmechanically compacted soil shall be available for water absorption and root growth in planted areas.
2. Incorporation of compost or natural fertilizer into the soil to a minimum depth of eight inches at a minimum rate of six cubic yards per one thousand square feet or per specific amendment recommendations from a soils laboratory report.
3. A minimum three-inch layer of mulch shall be applied on all exposed soil surfaces of planting areas except in turf areas, creeping or rooting groundcovers or direct seeding applications.
B. Plants.
1. Selected plants shall not cause the estimated water use to exceed the maximum applied water allowance (see calculation in Appendix A of Section 15.30.110).
2. Plants with similar water use needs shall be grouped together in distinct hydrozones and, where irrigation is required, the distinct hydrozones shall be irrigated with separate valves.
3. Low- and moderate-water-use plants can be mixed, but the entire hydrozone will be classified as moderate water use for MAWA calculations.
4. High-water-use plants shall not be mixed with low- or moderate-water-use plants.
5. All nonturf plants shall be selected, spaced and planted appropriately based upon their adaptability to the climatic, geologic, and topographical conditions of the project site.
6. Turf shall not be planted in the following conditions:
a. Slopes exceeding ten percent;
b. Planting areas eight feet wide or less;
c. Street medians, traffic islands, planter strips or bulb-outs of any size.
7. Invasive plants as listed by the California Invasive Plant Council are prohibited.
C. Water Features.
1. Recirculating water systems shall be used for water features.
2. Recycled water shall be used when available on site. (Ord. 674-2010 (part), 2010)
15.30.050 Irrigation design plan.
For each landscape project subject to this chapter applicants shall submit an irrigation design plan that is designed and installed to meet irrigation efficiency criteria as described in Appendix A of Section 15.30.110 (MAWA) and in accordance with the following:
A. Dedicated irrigation meter or submeter must be specified.
B. Irrigation systems with meters one and one-half inches or greater require a high-flow sensor that can detect high flow conditions and have the capabilities to shut off the system.
C. Isolation valves shall be installed at the point of connection and before each valve or valve manifold.
D. Weather-based or other sensor-based self-adjusting irrigation controllers shall be required.
E. Rain sensors shall be installed for each irrigation controller.
F. Pressure regulation and/or booster pumps shall be installed so that all components of the irrigation system operate at the manufacturer’s recommended optimal pressure.
G. Irrigation system shall be designed to prevent runoff or overspray onto nontargeted areas.
H. Point source irrigation is required where plant height at maturity will affect the uniformity of an overhead system and for narrow or irregularly shaped areas less than eight feet in width in any direction.
I. A minimum twenty-four-inch setback of overhead irrigation is required where turf is directly adjacent to a continuous hardspace that flows into the curb and gutter. Allowable irrigation within the setback from nonpermeable surfaces may include drip, drip line, or other low-flow, nonspray technology. The setback area may be planted or unplanted. The surfacing of the setback may be mulch, gravel, or other porous material.
J. Slopes greater than fifteen percent shall be irrigated with point source or other low-volume irrigation technology.
K. A single valve shall not irrigate hydrozones that mix high water use plants with moderate or low water use plants.
L. Trees shall be placed on separate valves except when planted in turf areas.
M. Sprinkler head, rotors and other emission devices on a valve shall have matched precipitation rates.
N. Head to head coverage is required unless otherwise directed by the manufacturer’s specifications.
O. Swing joints or other riser protection components are required on all risers.
P. Check valves shall be installed to prevent low-head drainage.
Q. Irrigation services shall require an approved backflow prevention assembly in accordance with city standards. (Ord. 674-2010 (part), 2010)
15.30.060 Documentation for compliance.
The following documentation is to be presented to the city at each of the three steps of review defined below. This documentation is required for compliance with this policy.
A. Final Design Review. The following shall be submitted with a design review application.
1. A completed Appendix A of Section 15.30.110, maximum applied water allowance (MAWA).
2. A landscape planting design plan that accurately and clearly identifies and depicts:
a. Recreational areas.
b. New and existing trees, shrubs, groundcovers, turf, and any other planting areas.
c. Plants by botanical and common names.
d. Plant sizes and quantities.
e. Areas permanently and solely dedicated to edible plants.
f. Property lines, new and existing building footprints, streets, driveways, sidewalks and other hardscape features.
g. Pools, fountains, and water features, with their respective surface areas.
h. Each hydrozone by number, letter or other method.
i. Each hydrozone as low, moderate, high water or mixed water use.
j. Types and quantities of soil amendments used.
k. Location and installation details of any applicable stormwater best management practices that encourage on-site retention and infiltration of stormwater.
l. Any applicable rain harvesting or catchment technologies.
m. Areas irrigated with recycled water.
3. A conceptual irrigation design plan or statement which describes irrigation methods and design actions that will be employed to meet the irrigation specifications of this chapter.
B. Building Permit/Plan Check. The following shall be reviewed and approved prior to a building permit being issued.
1. Appendix A of Section 15.30.110 and the planting design plan as submitted at Step 1 in connection with the design review application.
2. The irrigation plan drawn at the same scale as the planting plan that accurately and clearly identifies and depicts:
a. Irrigation system point of connection with location and size of separate water meters for irrigation.
b. Static water pressure as tested at the point of connection to the public water supply or as derived from nearest fire hydrant. The standard public works hydrant pressure testing fee shall apply when city field staff is deployed to obtain necessary hydrant pressures.
c. Flow rate (gallons per minute), precipitation rate (inches per hour), and design operating pressure (pressure per square inch) for each station.
d. Irrigation system components, e.g., controller, pipe, remote-control valves, sprinklers and other application devices, rain shut-off device, check valves, pressure regulation devices, and backflow prevention devices.
3. Appendix B of Section 15.30.110, the Hydrozone Table.
4. Where slopes exceed ten percent, a grading plan drawn at the same scale as the planting plan that accurately and clearly identifies and depicts:
a. Finished grades;
b. Drainage patterns;
c. Pad elevations;
d. Spot elevations;
e. Stormwater retention improvements, if applicable;
f. The grading plan shall contain the following statement: “I have complied with the criteria of the Water Efficient Landscape Ordinance and applied them accordingly for the efficient use of water in the grading design plan” and shall bear the signature of a civil engineer as authorized by law.
C. Completion of Installation. Upon installation and completion of the landscape, applicant shall submit Appendix C of Section 15.30.110, the Certificate of Completion.
1. The certificate must be accompanied by an irrigation audit report completed by a certified landscape irrigation auditor that contains the following:
a. Operating pressure of the irrigation system;
b. Distribution uniformity of overhead irrigation;
c. Precipitation rate of overhead irrigation;
d. Report of any overspray or broken irrigation equipment;
e. Irrigation schedule including:
i. Plant establishment irrigation schedule;
ii. Regular irrigation schedule by month including: plant type, root depth, soil type, slope factor, shade factor, irrigation interval (days per week), irrigation runtimes, number of start times per irrigation day, gallons per minute for each valve, precipitation rate, distribution uniformity and monthly estimated water use calculations.
2. An irrigation maintenance schedule timeline must be attached to the certificate of completion that includes: routine inspections, adjustment and repairs to the irrigation system, aerating and dethatching turf areas, replenishing mulch, fertilizing, pruning, and weeding.
3. A final inspection shall be performed by city staff (park and landscape main lead worker or as designated by the city manager) to verify compliance with the approved plans. Advanced notice is required for all inspections. Building permit final approval shall not be completed until the landscape inspection is approved. An extension of the building permit to complete landscape and irrigation installation shall be required and must be approved by the building inspector prior to occupancy. (Ord. 674-2010 (part), 2010)
15.30.070 Fees.
The city council shall establish a schedule of fees for the processing of landscape inspections. (Ord. 674-2010 (part), 2010)
15.30.080 Other provisions.
A. The planning director will consider and may allow the substitution of design alternatives and innovation which may equally reduce water consumption for any of these alternatives.
B. The planning director will accept documentation methods, water allowance determination, and landscape and irrigation design requirements of the state of California Model Water Efficient Landscape Ordinance instead of Sections 15.30.040 and 15.30.050 of this chapter where it can be demonstrated that the state procedure will more effectively address the design requirements of the project. (Ord. 674-2010 (part), 2010)
15.30.090 Provisions for appeal.
The applicant or any affected person may appeal the final decision of staff regarding plan check or final inspection to the city manager by filing a written notice of appeal with the city manager’s office within ten working days of the date of the decision. The applicant must pay the standard planning schedule appeal fee and include receipt of payment along with the written notice of appeal. The decision of the city manager shall be final and may not be appealed to the city council. An appeal regarding plan check must be submitted prior to the installation of the landscape or it will be deemed to have been waived. (Ord. 674-2010 (part), 2010)
15.30.100 Enforcement.
Any responsible party (as that term is defined in Section 1.10.030, including, without limitation, any agent, employee, or contractor of the responsible party) violating or contributing to the violation of any section of this chapter shall be subject to enforcement as provided in Chapters 1.10 through 1.15 and in any other applicable law. (Ord. 674-2010 (part), 2010)
15.30.110 Forms.
The following forms (Appendices A, B and C) shall be submitted as outlined in Section 15.30.060:
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Appendix A |
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Maximum Applied Water Allowance |
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Project Name _________________________________________________________ |
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Maximum Applied Water Allowance (MAWA) |
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Calculate the project’s Maximum Applied Water Allowance using the following equation: |
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MAWA |
= (ETo x 0.62) (0.7 x LA + 0.3 x SLA) |
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where: |
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MAWA |
= Maximum Applied Water Allowance (gallons per year) |
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ETo |
= Reference Evapotranspiration (40.7 inches per year for Cloverdale) |
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0.7 |
= ET Adjustment Factor |
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LA |
= Total Landscape Area, including any Special Landscape Area (square feet) |
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0.62 |
= Conversion factor (to gallons per square foot) |
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SLA |
= Special Landscape Area (square feet) |
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0.3 |
= ET Adjustment Factor for Special Landscape Area (1.0 - 0.7 = 0.3) |
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Show calculations below. |
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Maximum Applied Water Allowance = ___________________ gallons per year |
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Hydrozone Map |
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Attach a hydrozone map to this worksheet. Hydrozones shall be designated by number, letter or other designation. |
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Estimated Total Water Use (ETWU) |
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Calculate the project’s Estimated Total Water Use using the following equation: |
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where: |
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ETWU |
= Estimated total water use per year (gallons) |
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ETo |
= Reference Evapotranspiration (40.7 inches per year in Cloverdale) |
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0.62 |
= Conversion factor (to gallons per square foot) |
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ΣWU |
= Total water use from Water Use by Hydrozone Table (below) |
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IE |
= Irrigation efficiency (minimum 0.71) |
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SLA |
= Special Landscape Area (square feet) |
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Show calculations below. |
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Estimated Total Water Use = ___________________ gallons per year |
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Appendix B
Hydrozone Table
This worksheet is filled out by the project applicant and is a required element of the landscape documentation package. Please complete the hydrozone table(s) for each hydrozone. Use as many tables as necessary to provide the square footage of landscape area per hydrozone.
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Hydrozone* |
Zone or Valve |
Irrigation Method** |
Area (Sq. Ft.) |
% of Landscape Area |
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Total |
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100% |
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Summary Hydrozone Table |
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Hydrozone* |
Area (Sq. Ft.) |
% of Landscape Area |
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High Water Use |
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Moderate Water Use |
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Low Water Use |
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Total = |
100% |
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*Hydrozone |
**Irrigation Method |
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HW = High Water Use Plants |
MS = Microspray |
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MW = Moderate Water Use Plants |
S = Spray |
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LW = Low Water Use Plants |
R = Rotor |
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B = Bubbler |
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D = Drip |
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O = Other |
Appendix C
CERTIFICATE OF COMPLETION
This certificate is filled out by the project applicant upon completion of the landscape project.
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PART 1 |
Project Information Sheet |
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Date
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Project Name
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Name of Project Applicant |
Telephone No.
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Fax No.
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Title
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Email Address |
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Company
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Street Address |
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City
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State |
Zip Code |
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Property Owner or his/her designee: |
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Name |
Telephone No.
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Fax No.
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Title
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Email Address |
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Company
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Street Address |
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City
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State |
Zip Code |
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“I/we certify that I/we have received copies of all the documents within the Landscape Documentation Package and the Certificate of Completion and that it is our responsibility to see that the project is maintained in accordance with the Landscape and Irrigation Maintenance Schedule.” |
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Property Owner Signature |
Date |
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
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PART 2. |
Landscape Architect and Landscape Contractor/Installer |
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Landscape Architect Name |
Telephone No.
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Fax No.
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Title
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Email Address |
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License No. or Certification No.
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Company
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Street Address |
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City
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State |
Zip Code |
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“I/we certify that the work has been completed in accordance with Chapter 15.30 and that the landscape planting and irrigation installation conform to the criteria and specifications of the approved Landscape Documentation package. Additionally, per Section 15.30.060, a landscape audit and irrigation maintenance schedule have been completed and are attached to this certificate showing that the system meets the efficiency requirements used in the Maximum Applied Water Allowance calculation.” |
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Landscape Architect Signature |
Date |
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Landscape Contractor Signature |
Date |
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(Ord. 674-2010 (part), 2010)