Landscape Water Conservation Report

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The irrigation application is necessary to ensure that the landscape design and the irrigation design work together to achieve water efficiency.

Step 1: Measure the total landscape area   

  • Landscape area includes any area that will absorb water – lawn, plantings, and mulch areas. It also includes pervious paving or pervious decks.
  • Include the absorbent parts of boulevard between the property line and the street.
  • Do not include areas that won’t absorb water – buildings, impervious driveways or walks.  

Step 2: Design your water efficient yard

  • Divide your landscape into areas with similar water needs. These “hydrozones” can be no water zones, or low, medium or high water needs. If it helps the process, sketch out a simple diagram.
  • Consider microclimates - areas of your yard with different sun/wind exposure.
  • Determine the area (in square meters) of each hydrozone. You will need these numbers to complete the application. The sum of hydrozone areas must equal the total landscape area.

Step 3: Check if your design is water efficient

  • Download the Landscape Water Conservation Report (.xls). On the first page of the workbook, enter the details about your project and check off the irrigation system requirements.
  • On the second page, enter the total landscaped area as well as the areas of the individual hydrozones in the yellow highlighted areas.
  • The spreadsheet automatically calculates the Landscape Maximum Water Budget (WB), the Estimated Landscape Water Use (WU), and the difference between them.
    • WB - is the calculated annual water use if 100% of landscape area was irrigated lawn.
    • WU - is the estimated annual water use for irrigating the landscape based on your design.
  • The calculated difference between the WB and the WU is displayed as either a red or a blue number on the third page of the Application.
  • A red number indicates that your landscape/irrigation design is not water efficient. A blue number means it is ok to submit your application.
  • The goal is to reduce the WU of your landscape design below the WB. Try different designs to see which one results in more water saved. 

Step 4: Save and email your application

  • Once you are satisfied with your final design and calculated water use, save your application using the project address for the name (ex: 1435WaterStreet.xls).
  • Email the application to
  • You should get a reply within 48 hours with the status of your application.

Helpful tools:

Landscape Irrigation Guide
Design Guidelines
Landscape Water Conservation Application PDF