Hesperia Municipal Code § 16.20.640 Landscape design and irrigation design plan

A. Hesperia's approved plant list shall be used in the preparation of landscape plans. The plant list is available at the planning division and will be updated on a continual basis.

B. Landscape and irrigation plans shall be prepared, stamped, and signed by a licensed landscape architect, architect, engineer, land surveyor, certified irrigation designer, licensed landscape contractor, or any other person authorized to design an irrigation system with the following statement "I have complied with the criteria of the ordinance and applied them accordingly for the efficient use of water in the irrigation design plan".

C. Prior to issuance of a building permit, three copies of a landscape design plan consisting of landscape and irrigation plans consistent with the requirements of this chapter. Plans shall be drawn at a minimum scale of one inch equals eight feet (maximum sheet size 24" × 36") and shall be submitted to the building and safety division as part of the landscape documentation package (Appendix A)

D. Landscape documentation package includes:

1. Project information: date, project applicant, project address (parcel/lot number), total landscape area, project type (e.g new, rehabilitated, public, private, cemetery, homeowner-installed), water supply (e.g., potable, recycled, well) and identify the local retail water purveyor if the applicant is not served by a private well, checklist of all documents in the landscape documentation package, project contacts, applicant signature and date with statement "I agree to comply with the requirements of the water efficient landscape ordinance and submit a complete landscape documentation package."

2. Water efficient landscape worksheet:

a. Hydrozone information table.

b. Water budget calculations—Maximum Applied Water Allowance (MAWA) and Estimated Total Water Use (ETWU).

3. Soil management report;

4. Landscape design plan

5. Irrigation design plan;

E. Prior to construction, the project applicant shall:

1. Submit a landscape documentation package to the local agency.

F. Upon approval of the landscape documentation package by the local agency, the project applicant shall:

1. Receive a permit or approval of the plan check or design review and record the date of the permit in the certificate of completion;

2. Submit a copy of the approved landscape documentation package along with the record drawings, and any other information to the property owner or his/her designee; and

3. Submit a copy of the water efficient landscape worksheet to the local water purveyor.

G. Water efficient landscape worksheet.

1. A project applicant shall complete the water efficient landscape worksheet which contains two sections:

a. A hydrozone information table for the landscape project; and

b. A water budget calculation for the landscape project. For the calculation of the maximum applied water allowance and estimated total water use, a project applicant shall us the ETo value of 66.2.

2. Water budget calculations shall adhere to the following requirements:

a. The plant factor used shall be from WUCOLS. The plant factor ranges from o to 0.3 for low water use plans, form 0.4 to 0.6 for moderate water use plants, and from 0.7 to 1.0 for high water use plants.

b. All water features shall be included in the high water use hydrozone and temporarily irrigated areas shall be include in the low water use hydrozone.

c. All special landscape areas shall be identified and their water use calculated as described below.

d. ETAF for special landscape areas shall not exceed 1.0. For the purpose of determining maximum applied water allowance, average irrigation efficiency is assumed to be 0.71. Irrigation systems shall be designed, maintained, and managed to meet or exceed and average landscape irrigation efficiency of 0.71.

3. Maximum applied water allowance shall be calculated using the equation:

MAWA = (ETo) (0.62) [(0.7 × LA) + (0.3 × SLA)]

ETo = Reference Evapotranspiration (inches per year)

0.62 = Conversion Factor (to gallons)

0.7 = ET Adjustment Factor (ETAF)

LA = Landscape Area including SLA (square feet)

0.3 = Additional Water Allowance for SLA

SLA = Special Landscape Area (square feet)

4. Estimated total water use shall be calculated using the equation below. The sum of the estimated total water use calculated for all hydrozones shall not exceed MAWA.

ETWU = [(ETo) (0.62)] [(PF × HA)/IE + SLA)]

ETo = Reference Evapotranspiration (inches)

PF = Plant Factor form WUCOLS

HA = Hydrozone Area [high, medium, and low water use areas] (square feet)

SLA = Special Landscape Area (square feet)

0.62 = Conversion Factor

IE = Irrigation Efficiency (minimum 0.71)

I. The landscape plan shall be drawn on project base sheets and be fully dimensioned and shall comply with Section 16.20.590.

J. Irrigation Plan. A fully dimensioned irrigation plan shall be drawn on project base sheets separate from the landscape design plan. The scale and format shall be the same as the landscape plan and comply with Section 16.20.590.

(Ord. No. 2010-06, § 2(Exh. A), 8-17-10)