Page 13 - Efficient Irrigation and Landscape Design Standards

supply (or to a water well where applicable).
» Total landscape water demand, effective rainfall, watering window, assumed irrigation system efficiency, and system operation constraints.
» Layout of the irrigation system, (i.e. backflow prevention device, pump, pressure regulator, automatic controller, main and lateral lines, valves, sprinklers, bubblers, drip emitters, quick couplers, and filters where applicable).
» A legend containing a general description of all components of the irrigation system, including: manufacturer’s name and model number, operating pressure, manufacturer’s irrigation nozzle rating in gallons per minute (g.p.m.) or gallons per hour (g.p.h.), as necessary, spray radius, and calculated precipitation rate per nozzle, based on the Irrigation Design Plan.
» A critical zone pressure calculation indicating the highest pressure demand to assure adequate operating pressure.
» A valve chart indicating flow rate (in gallons per minute) and design operating pressure, (p.s.i). for each valve, and precipitation rates in inches per hour.
» Installation specifications and details for workmanship and installation of irrigation components and requirements for owner/operator training.
» A calculation of the estimated applied irrigation water to establish the landscape.
» A calculation of the estimated applied irrigation water for the landscape at maturity.
6. The irrigation system must be audited and accepted at the completion of installation by an IA-certified irrigation auditor.
3.4 QUALIFICATIONS TO PREPARE LANDSCAPE AND IRRIGATION DOCUMENTATION
The local jurisdiction should determine who is qualified to prepare landscape and irrigation plans. It is recommended that landscape plans be prepared by a licensed landscape architect, licensed/certified landscape contractor, or any other person authorized to design a landscape.

From the City of Lakewood, WA Municipal Code:
Persons Qualified to Prepare Landscape Plans. The landscape plans shall be prepared by a Washington state registered landscape architect, a Washington state certified nurseryman, or a Washington state certified landscaper, except that planting plans for short plats may be prepared by the applicant, subject to approval by the Community Development Director.
Persons Qualified to Prepare Irrigation Plans. The irrigation plan shall be prepared by a Washington State registered landscape architect or an Irrigation Association Certified Irrigation Designer, except that irrigation plans for short plats may be prepared by the applicant.
EFFICIENT IRRIGATION & LANDSCAPE DESIGN STANDARDS 13