Chapter 18.40 DEVELOPMENT STANDARDS – LANDSCAPING AND WATER USE

Chapter 18.40
DEVELOPMENT STANDARDS – LANDSCAPING AND WATER USE

Sections:

18.40.010 Purpose.

18.40.020 Application.

18.40.030 Land use grouping.

18.40.040 Landscaping – Screen types and description.

18.40.050 Landscaping – Street frontages.

18.40.060 Landscaping – Interior lot lines.

18.40.070 Landscaping – Building perimeter.

18.40.080 Landscaping – Surface parking areas.

18.40.090 Landscaping – Adjacent to freeway rights-of-way.

18.40.100 Landscaping – General standards for all landscape areas.

18.40.110 Landscaping – Additional standards for required landscape areas.

18.40.120 Landscaping – Alternative options.

18.40.130 Landscaping – Plan design, design review, and installation.

18.40.140 Maintenance.

18.40.150 Financial guarantees.

18.40.160 Water use – Applicability of water budget for landscape areas.

18.40.170 Water use – Irrigation water budget calculated.

18.40.180 Water use – Estimated water use calculated.

18.40.190 Water use – Irrigation efficiency goals and system design standards.

18.40.200 Water use – Irrigation system design, design review and audit at installation.

18.40.210 Water use – Irrigation design plan contents.

18.40.220 Water use – Irrigation schedules.

18.40.230 Water use – Irrigation system maintenance.

18.40.010 Purpose.

The purpose of this chapter is to preserve the aesthetic character of communities, to improve the aesthetic quality of the built environment, to promote retention and protection of existing vegetation; to promote water efficiency, to promote native wildlife, to reduce the impacts of development on drainage systems and natural habitats, and to increase privacy for residential zones by:

(1) Providing visual relief from large expanses of parking areas and reduction of perceived building scale;

(2) Providing physical separation between residential and nonresidential areas;

(3) Providing visual screens and barriers as a transition between differing land uses;

(4) Retaining existing vegetation and significant trees by incorporating them into the site design;

(5) Providing increased areas of permeable surfaces to allow for:

(a) Infiltration of surface water into ground water resources;

(b) Reduction in the quantity of storm water discharge; and

(6) Encouraging the use of native plant species by their retention or use in the landscape design;

(7) Requiring water use efficiency through water budgeting and efficient irrigation design standards;

(8) Encouraging the use of a diversity of plant species, which promote native wildlife habitat. (Ord. 42-02 § 2 (21A.16.010))

18.40.020 Application.

All development shall be subject to the landscaping provisions of this chapter; provided, that specific landscaping and tree retention provisions for uses established through a conditional use permit, a special use permit, or an urban planned development application shall be determined during the applicable review process. (Ord. 42-02 § 2 (21A.16.020))

18.40.030 Land use grouping.

To facilitate the application of this chapter, the land uses of Chapter 18.25 CMC have been grouped in the following manner:

(1) “Residential development” refers to those uses listed in CMC 18.25.030, except those uses listed under “Accessory Uses,” and:

(a) “Attached/group residences” refers to:

(i) Townhouses, except as provided in subsection (1)(b)(i) of this section;

(ii) Apartments, and detached dwelling units developed on common property at a density of 12 or more units per acre;

(iii) Senior citizen assisted housing;

(iv) Temporary lodging;

(v) Group residences other than Type I community residential facilities;

(vi) Manufactured home parks; and

(b) “Single-family development” refers to:

(i) Residential subdivisions and short subdivisions, including attached and detached dwelling units on individually platted or short platted lots;

(ii) Any detached dwelling units located on a lot; and

(iii) Type I community residential facilities;

(2) “Commercial development” refers to those uses in:

(a) CMC 18.25.040 as amusement/entertainment uses, except golf facilities;

(b) CMC 18.25.050 except recycling centers, health and educational services, day care I, churches, synagogues and temples;

(3) “Industrial development” refers to those uses listed in:

(a) CMC 18.25.050 as recycling center;

(b) CMC 18.25.060 except government services;

(d) CMC 18.25.090 as mineral extraction and processing;

(4) “Institutional development” refers to those uses listed in:

(a) CMC 18.25.040 as cultural uses, except arboretums;

(b) CMC 18.25.050 as churches, synagogues and temples, health services, and education services except specialized instruction schools permitted as an accessory use; and

(5) “Utility development” refers to those uses listed in CMC 18.25.060 as utility facilities; and

(6) Uses that are not listed in subsections (1) through (5) of this section shall not be subject to landscaping and tree retention requirements except as specified in any applicable review of a conditional use or special use permits. (Ord. 42-02 § 2 (21A.16.030))

18.40.040 Landscaping – Screen types and description.

The three types of landscaping screens are described and applied as follows:

(1) Type I Landscaping Screen.

(a) Type I landscaping is a “full screen” that functions as a visual barrier. This landscaping is typically found adjacent to freeways and between residential and nonresidential areas.

(b) Type I landscaping shall minimally consist of:

(i) A mix of primarily evergreen trees and shrubs generally interspersed throughout the landscape strip and spaced to form a continuous screen;

(ii) Between 70 and 90 percent evergreen trees;

(iii) Trees provided at the rate of one per 10 linear feet of landscape strip and spaced no more than 30 feet apart on center;

(iv) Evergreen shrubs provided at the rate of one per linear four feet of landscape strip and spaced no more than eight feet apart on center; and

(v) Ground cover pursuant to CMC 18.40.110;

(2) Type II Landscaping Screen.

(a) Type II landscaping is a “filtered screen” that functions as a visual separator. This landscaping is typically found between commercial and industrial uses; between differing types of residential development; and to screen industrial uses from the street;

(b) Type II landscaping shall minimally consist of:

(i) A mix of evergreen and deciduous trees and shrubs generally interspersed throughout the landscape strip spaced to create a filtered screen;

(ii) At least 50 percent deciduous trees and at least 30 percent evergreen trees;

(iii) Trees provided at the rate of one per 20 linear feet of landscape strip and spaced no more than 30 feet apart on center;

(iv) Shrubs provided at the rate of one per four linear feet of landscape strip and spaced no more than eight feet apart on center; and

(v) Ground cover pursuant to CMC 18.40.110;

(3) Type III Landscaping Screen.

(a) Type III landscaping is a “see-through screen” that functions as a partial visual separator to soften the appearance of parking areas and building elevations. This landscaping is typically found along street frontage or between apartment developments;

(b) Type III landscaping shall minimally consist of:

(i) A mix of evergreen and deciduous trees generally interspersed throughout the landscape strip and spaced to create a continuous canopy;

(ii) At least 70 percent deciduous trees;

(iii) Trees provided at the rate of one per linear 25 feet of landscape strip and spaced no more than 30 feet apart on center;

(iv) Shrubs provided at the rate of one per four linear feet of landscape strip and spaced no more than eight feet apart on center; and

(v) Ground cover pursuant to CMC 18.40.110. (Ord. 42-02 § 2 (21A.16.040))

18.40.050 Landscaping – Street frontages.

The average width of perimeter landscaping along street frontages shall be provided as follows:

(1) Twenty feet of Type II landscaping shall be provided for an institutional use, excluding playgrounds and playfields;

(2) Ten feet of Type II landscaping shall be provided for an industrial development;

(3) Ten feet of Type II landscaping shall be provided for an above-ground utility facilities development, excluding distribution and transmission corridors, located outside a public right-of-way;

(4) Ten feet of Type III landscaping shall be provided for a commercial or attached/group residence development if not placed adjacent to the property line in conformance with the design manual; and

(5) For all development:

(a) Trees shall be planted at the rate of one tree for every 35 feet of frontage along all public/private streets;

(b) The trees shall be:

(i) Located within the street right-of-way or utility easement;

(ii) No more than 20 feet from the street right-of-way line if located within a lot;

(iii) Maintained by the adjacent landowner unless part of a City maintenance program;

(iv) A species approved by the City and compatible with overhead utility lines, if present;

(v) All street trees shall be installed with watering tubes and root barriers as provided in the approved detail;

(c) The trees may be spaced at irregular intervals to accommodate sight distance requirements for driveways and intersections. (Ord. 42-02 § 2 (21A.16.050))

18.40.060 Landscaping – Interior lot lines.

The average width of perimeter landscaping along interior lot lines shall be provided as follows:

(1) Twenty feet of Type I landscaping shall be included in a commercial or industrial development along any portion adjacent to a residential development;

(2) Five feet of Type II landscaping shall be included in an attached/group residence development, except that along portions of the development adjacent to property developed with single detached residences or vacant property that is zoned R-1 through R-8, the requirement shall be 10 feet of Type II landscaping;

(3) Ten feet of Type II landscaping shall be included in an industrial development along any portion adjacent to a commercial or institutional development; and

(4) Ten feet of Type II landscaping shall be included in an institutional use, excluding playgrounds and playfields, or an above-ground utility facility, except distribution or transmission corridors when located outside a public right-of-way. (Ord. 42-02 § 2 (21A.16.060))

18.40.070 Landscaping – Building perimeter.

The average width of perimeter landscaping along any building/structure parameter shall be provided as follows:

(1) Building frontage placed adjacent to a public right-of-way in conformance with the adopted design manual shall be exempt from this provision.

(2) Five feet of Type III landscaping shall be provided.

(3) Potted landscape material may be substituted for the requirements of subsection (2) of this section in areas designed for outdoor eating with the approval of the Department.

(4) Shrubs may be substituted for a portion of the required trees as prescribed in CMC 18.40.040 as approved by the Department. (Ord. 42-02 § 2 (21A.16.065))

18.40.080 Landscaping – Surface parking areas.

Parking area landscaping shall be provided within surface parking areas with 10 or more parking stalls for the purpose of improving air quality, reducing surface water runoff, providing shade and diminishing the visual impacts of large paved areas as follows:

(1) Residential developments with common parking areas shall provide planting areas at the rate of 20 square feet per parking stall;

(2) Commercial, industrial or institutional developments shall provide landscaping at a rate of:

(a) Twenty square feet per parking stall if 10 to 30 parking stalls are provided; and

(b) Twenty-five square feet per parking stall if 31 or more parking stalls are provided;

(3) Trees shall be provided and distributed throughout the parking area at a rate of:

(a) One tree every 10 parking stalls consistent with the design manual; and

(b) Trees placed at the end of every parking row;

(4) Permanent curbs or structural barriers shall be provided to protect the plantings from vehicle overhang;

(5) Landscaping around the perimeter of a site that is in addition to the perimeter landscaping required by CMC 18.40.050 may count toward 10 percent of the required surface parking area landscaping if it is adjacent to the parking area; and

(6) Parking area landscaping shall consist of:

(a) Canopy-type deciduous trees, evergreen trees, evergreen shrubs and ground covers planted in islands or strips;

(b) Shrubs that do not exceed a maintained height of 42 inches;

(c) Plantings contained in planting islands or strips having an area of at least 100 square feet and with a narrow dimension of no less than five feet or as required by the design manual;

(d) Ground cover in accordance with CMC 18.40.110; and

(e) At least 70 percent of trees are deciduous. (Ord. 42-02 § 2 (21A.16.070))

18.40.090 Landscaping – Adjacent to freeway rights-of-way.

(1) All residential developments shall provide a minimum average width of 20 feet of Type I landscaping adjacent to freeway rights-of-way.

(2) All other developments shall provide a minimum average width of 20 feet of Type III landscaping adjacent to freeway rights-of-way. (Ord. 42-02 § 2 (21A.16.080))

18.40.100 Landscaping – General standards for all landscape areas.

All new landscape areas proposed for a development shall be subject to the following provisions:

(1) Berms shall not exceed a slope of two horizontal feet to one vertical foot.

(2) All new turf areas, except all-weather, sand-based athletic fields shall:

(a) Be augmented with a three-inch layer of organic material cultivated a minimum of six inches deep; or

(b) Have an organic content of five percent or more to a depth of six inches as shown in a soil sample analysis. The soil analysis shall include:

(i) Determination of soil texture, indicating percentage of organic matter;

(ii) An approximated soil infiltration rate (either measured or derived from soil/texture /infiltration rate tables). A range of infiltration rates shall be noted where appropriate; and

(iii) Measure Ph value.

(3) Except as specifically outlined for turf areas in subsection (2) of this section, the organic content of soils in any landscape area shall be as necessary to provide adequate nutrient and moisture-retention levels for the establishment of plantings.

(4) Landscape areas, except turf or areas of established ground cover, shall be covered with at least two inches of mulch to minimize evaporation.

(5) Plants having similar water use characteristics shall be grouped together in distinct hydrozones.

(6) Plant selection shall consider adaptability to climatic, geologic, and topographical conditions of the site. Preservation of existing vegetation is encouraged. (Ord. 42-02 § 2 (21A.16.085))

18.40.110 Landscaping – Additional standards for required landscape areas.

In addition to the general standards of CMC 18.40.100, landscape areas required pursuant to CMC 18.40.050 through 18.40.090 shall conform to the following standards:

(1) All plants shall conform to American Association of Nurserymen (AAN) grades and standards as published in the “American Standard for Nursery Stock” manual; provided, that existing healthy vegetation used to augment new plantings shall not be required to meet the standards of this manual;

(2) Single-stemmed trees required pursuant to this chapter shall at the time of planting conform to the following standards:

(a) In parking area landscaping and in street rights-of-way:

(i) Deciduous trees shall have a minimum caliper of 1.75 inches and a height of 10 feet; and

(ii) Coniferous and broadleaf evergreens shall be at least five feet in height;

(b) In all other required landscape areas:

(i) Deciduous trees shall have a minimum caliper of 1.75 inches and a height of 10 feet; and

(ii) Coniferous and broadleaf evergreen trees shall be at least five feet in height.

(c) All trees shall have watering tubes installed per the approved City detail or be watered by an approved irrigation system;

(3) Multiple-stemmed trees shall be permitted as an option to single-stemmed trees; provided, that such multiple-stemmed trees are:

(a) At least six feet in height; and

(b) Not allowed within street rights-of-way;

(4) When the width of any landscape strip is 20 feet or greater, the required trees shall be staggered in two or more rows;

(5) Shrubs shall be:

(a) At least an AAN Container Class No. 2 size at time of planting in Type II, III and parking area landscaping;

(b) At least 24 inches in height at the time of planting for Type I landscaping; and

(6) Ground covers shall be planted and spaced to result in total coverage of the majority of the required landscape area within three years;

(7) All fences shall be placed on the inward side of any required perimeter landscaping along the street frontage;

(8) Required street landscaping may be placed within City of Covington street rights-of-way subject to the City road design standards, provided adequate space is maintained along the street line to replant the required landscaping should subsequent street improvements require the removal of landscaping within the rights-of-way;

(9) Required street landscaping may be placed within Washington State rights-of-way subject to permission of the Washington State Department of Transportation;

(10) New landscape material provided within areas of undisturbed vegetation or within the protected area of significant trees shall give preference to utilizing indigenous plant species. (Ord. 42-02 § 2 (21A.16.090))

18.40.120 Landscaping – Alternative options.

The following alternative landscape options may be allowed, subject to approval by the Department, only if they accomplish equal or better levels of screening, or when existing conditions on or adjacent to the site, such as significant topographic differences, vegetation, structures or utilities would render application of this chapter ineffective or result in scenic view obstruction:

(1) The amount of required landscape area may be reduced to ensure that the total area for required landscaping and/or the area remaining undisturbed for the purpose of wildlife habitat or corridors does not exceed 15 percent of the net developable area of the site. For the purpose of this subsection, the net developable area of the site shall not include areas deemed unbuildable due to their location within sensitive areas and any associated buffers;

(2) The average width of the perimeter landscape strip may be reduced up to 25 percent along any portion where:

(a) Berms at least three feet in height or architectural barriers at least six feet in height are incorporated into the landscape design; or

(b) The landscape materials are incorporated elsewhere on-site;

(3) In pedestrian district overlays, street perimeter landscaping may be waived provided a site plan, consistent with the applicable adopted area zoning document, is approved that provides street trees and other pedestrian-related amenities;

(4) Where a local or subarea plan with design guidelines has been adopted, the Director shall base the landscaping modifications on the policies and guidelines of such plan;

(5) When an existing structure precludes installation of the total amount of required site perimeter landscaping, such landscaping material shall be incorporated on another portion of the site;

(6) Single-stemmed deciduous tree species that cannot generally be planted and established in larger sizes may have a caliper of less than 1.75 inches; and

(7) The Department shall develop and maintain an advisory listing of trees recommended for new plantings. Such list shall describe their general characteristics and suitability, and provide guidelines for their inclusion within required landscape areas. (Ord. 42-02 § 2 (21A.16.100))

18.40.130 Landscaping – Plan design, design review, and installation.

(1) The landscape plan submitted to the Department shall be drawn on the same base map as the development plans and shall identify the following:

(a) Total landscape area and separate hydrozones;

(b) Landscape materials botanical/common name and applicable size;

(d) Impervious surfaces;

(e) Natural or manmade water features or bodies;

(f) Existing or proposed structures, fences, and retaining walls;

(g) Natural features or vegetation left in natural state;

(h) Designated recreational open space areas; and

(i) Decorative and street lighting locations.

(2) The proposed landscape plan shall be certified by a Washington State registered landscape architect, Washington State certified nurseryman, or Washington State certified landscaper.

(3) An affidavit signed by an individual specified in subsection (2) of this section, certifying that the landscaping has been installed consistent with the approved landscaping plan, shall be submitted to the Department within 30 days of installation completion, unless the installed landscaping has been inspected and accepted by the Department.

(4) The required landscaping shall be installed no later than three months after issuance of a certificate of occupancy for the project or project phase. However, the time limit for compliance may be extended to allow installation of such required landscaping during the next appropriate planting season. A financial guarantee shall be required prior to issuance of the certificate of occupancy, if landscaping is not installed and inspected prior to occupancy. (Ord. 20-07 § 117; Ord. 42-02 § 2 (21A.16.115))

18.40.140 Maintenance.

(1) All landscaping shall be maintained for the life of the project.

(2) All landscape materials shall be pruned and trimmed as necessary to maintain a healthy growing condition or to prevent primary limb failure.

(3) With the exception of dead, diseased or damaged trees specifically retained to provide wildlife habitat; other dead, diseased, damaged or stolen plantings shall be replaced within three months or during the next planting season if the loss does not occur in a planting season.

(4) Landscape areas shall be kept free of trash. (Ord. 42-02 § 2 (21A.16.180))

18.40.150 Financial guarantees.

Financial guarantees shall be required consistent with the provisions of CMC Title 14.

(1) Prior to receiving a temporary or permanent occupancy certificate for any building or structure for which landscaping is required, an applicant shall provide a performance guarantee adequate to secure the completion and improvement of required landscaping, in accordance with the approved site plan, within three months following issuance of the building or buildings temporary or permanent occupancy certificate, whichever comes first.

(2) Performance guarantees for landscaping shall be sufficient to cover the cost of conformance with conditions of the permit, and shall be required for a period of two years after the planting or transplanting of vegetation to insure proper installation, establishment and maintenance. This time period may be extended by one year by the Director, if necessary to cover a planting and growing season.

(3) The Director may extend the time limit for compliance with the above landscaping requirement up to one year after issuance of the occupancy certificate if circumstances beyond the control of the applicant warrant an extension. The request for an extension shall be in writing, accompanied by a fee for the extension request as set forth in the current fee resolution, and a schedule for completion of remaining work.

(4) Fees. Landscaping installation inspections, performance guarantee release inspections, and requests for extensions are subject to fees as set forth in the current fee resolution. (Ord. 20-07 §§ 85, 118; Ord. 43-02 § 2; Ord. 42-02 § 2 (21A.16.190). Partially from former 14.110.070)

18.40.160 Water use – Applicability of water budget for landscape areas.

Irrigation systems of any type are required components of a landscape area, unless otherwise approved by the Department. A water budget for irrigation purposes shall be established for all development, except for:

(1) Individually platted single dwelling (attached or detached) residential lots; provided, that developer-installed landscaping in common areas of residential projects is not exempt; and

(2) Any project with a total landscaped area less than 500 square feet. (Ord. 42-02 § 2 (21A.16.300))

18.40.170 Water use – Irrigation water budget calculated.

(1) The water budget (WB) allocation shall be calculated using the following formula:

WB = (Eto) x (AF) x (LA) x (CF)

Eto: Referenced evapotranspiration rate (net seasonal irrigation requirement in inches – see table below)

AF: Adjustment factor value of 0.8 (i.e., 0.5 x (Eto)/0.625 irrigation efficiency coefficient)

LA: Landscape area (square feet)

CF: Conversion factor value of 0.62 (Eto inches to gallons per square foot)

Reference Eto Table – Historical Data*


	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Season Total
Monthly Net Irrigation Requirement (inches)	.00	.00	.00	.00	1.59	3.13	4.46	3.51	1.77	.03	.00	.00	14.49

*These figures are based on a 30-year average of National Weather Service Data and represent the amount of additional irrigation required for turf grass. The figures are adjusted for turf typically used in commercial landscaping.

(2) The City shall, within three years of the implementation of this chapter, submit an evaluation of the WB calculation formula outlined in subsection (1) of this section. The evaluation shall include a recommendation to retain or modify the adjustment factor or components thereof, and shall be made in consultation with groups including landscape professionals and water purveyors.

(3) The water budget will be calculated upon the total area of the site in landscape areas and in landscape water features (such as decorative ponds, pools or fountains) that are fed by irrigation water. For the purpose of calculating the water budget, “landscape area” shall mean the entire parcel, less:

(a) Sensitive areas and their buffers;

(b) The building footprint;

(d) Paved portions of parking lots; and

(e) Hardscapes (e.g., decks, patios, sidewalks, and other nonporous areas).

(4) Areas such as playgrounds, sport fields, golf courses, school yards, or other recreational spaces where the turf provides a playing surface or serves other recreational purposes may be allowed additional water beyond the established water budget. In order to receive additional water for such turf areas, the applicant shall submit a statement designating such turf areas for recreational purposes and specifying additional water needs above the water budget. This additional water need will be based upon the Eto information for the turfgrass species or species mix used in such turf areas.

(5) Landscape water features shall not use potable water unless the water feature recirculates water used in its operation.

(6) The irrigation water use may be monitored by the water purveyor on a yearly basis after the date of release of the performance bond.

(7) Alternative water sources such as recycled wastewater or rainwater are encouraged. Such water sources shall not be subject to the limits of the water budget. (Ord. 42-02 § 2 (21A.16.310))

18.40.180 Water use – Estimated water use calculated.

The estimated water use shall be calculated using the following provisions.

(1) Estimated water use (EWU) shall be calculated for each hydrozone by using the following formula:

EWU = (Eto) x (PF) x (HA) x (CF)

Eto: Referenced evapotranspiration rate (net seasonal irrigation requirement in inches – see table)

PF: Plant factor value (see subsection (2) of this section)

HA: Hydrozone area (square feet)

CF: Conversion factor value of 0.62 (Eto inches to gallons per square foot)

IE: Irrigation efficiency value

(2) Plant factor values shall be as follows, but may be adjusted pursuant to subsection (3) of this section:

(a) 0 to 0.3 for low water use plants;

(b) 0.4 to 0.6 for average water use plants; and

(3) For each hydrozone, plant factor values may be determined and adjusted by the designer (based on professional judgment and applicable reference materials) considering the relevant factors such as:

(a) Water requirements of the various plant species proposed;

(b) Density of the plantings;

(d) Soil conditions. (Ord. 42-02 § 2 (21A.16.320))

18.40.190 Water use – Irrigation efficiency goals and system design standards.

For purposes of this section, irrigation shall include any means of applying water to landscaped areas. All irrigation is at the applicant’s option. Manually applied irrigation methods shall comply with subsections (1) and (2) of this section. Irrigation applied through installed irrigation systems shall comply with subsections (1) through (3) of this section:

(1) Irrigation water shall be applied with goals of avoiding runoff, low head drainage, overspray, or other similar conditions where water flows onto adjacent property, nonirrigated areas, and impervious surfaces by:

(a) Considering soil type and infiltration rates;

(b) Using proper irrigation equipment and schedules, including features such as repeat cycles, to closely match application rates with infiltration rates; and

(2) All irrigation water outlets, except those using alternative water sources, shall be downstream of the meter used to measure irrigation water use.

(3) Irrigation systems shall be subject to the following additional provisions:

(a) Systems shall not be located on any:

(i) Turfgrass slopes exceeding a slope of three horizontal feet to one vertical foot; and

(ii) Turfgrass portions of median strips.

(b) Systems in landscape strips less than five feet in width shall be designed to ensure that overspray and/or runoff does not occur by use of system design options such as low volume emitters.

(d) Systems shall be designed with the minimum average irrigation efficiency of 0.625.

(e) The use of automatic shutoff or override capabilities using rain shutoffs or moisture sensors is encouraged.

(f) Systems shall utilize a master control valve connected to an automatic controller.

(g) Systems shall make provisions for winterization either by providing:

(i) Manual drains (automatic drain valves are not permitted at all low points); or

(ii) Means to blow out lines with pressurized air.

(h) Separate valves shall be used to irrigate plants with differing water needs.

(i) Sprinkler heads with consistent application rates shall be selected for proper area coverage, operating pressure, and adjustment capability. (Ord. 42-02 § 2 (21A.16.330))

18.40.200 Water use – Irrigation system design, design review and audit at installation.

(1) Irrigation plan design shall be certified by an Irrigation Association (IA) certified designer or a registered landscape architect or professional engineer with irrigation design experience.

(2) The irrigation system must be audited and accepted at installation by an IA certified irrigation auditor. (Ord. 42-02 § 2 (21A.16.340))

18.40.210 Water use – Irrigation design plan contents.

Proposed irrigation system design plans shall be drawn on the same base project map as the landscape plan and shall identify:

(1) Location and size of any proposed separate water meters for the landscape;

(2) Location, type, and size of all components of the irrigation system;

(3) Static water pressure at the point of connection to the water supply; and

(4) Flow rate (gallons per minute), application rates (inches per hour), and design operating pressure (PSI) for each station. (Ord. 42-02 § 2 (21A.16.350))

18.40.220 Water use – Irrigation schedules.

Irrigation schedules consistent with the following shall be submitted:

(1) A recommended irrigation program with monthly irrigation schedules based, at a minimum, on average monthly Eto shall be required for before and after establishment.

(2) The irrigation schedule shall:

(a) Include for each station the run time (in minutes per cycle) and cycles per week;

(b) Indicate the amount of applied water (in the applicable billing unit used by a purveyor);

(d) Be adjusted for additional water need in recreational areas;

(e) Incorporate additional operating criteria such as avoiding irrigation at times of high temperatures or winds. (Ord. 42-02 § 2 (21A.16.360))

18.40.230 Water use – Irrigation system maintenance.

Irrigation systems shall be maintained and inspected periodically to assure proper functioning. Replacement of components shall be of originally specified parts or materials, or their equivalents. (Ord. 42-02 § 2 (21A.16.370))