WEc1: Water efficient landscaping
To limit or eliminate the use of potable water or other natural surface or subsurface water resources available on or near the project site for landscape irrigation.
Option 1. Reduce by 50%
Reduce potable water consumption for irrigation by 50% from a calculated midsummer baseline case.
Reductions must be attributed to any combination of the following items:
Plant species, density and microclimate factor
Use of captured rainwater
Use of recycled wastewater
Use of water treated and conveyed by a public agency specifically for non-potable uses
Groundwater seepage that is pumped away from the immediate vicinity of building slabs and foundations may be used for landscape irrigation to meet the intent of this credit. However, the project team must demonstrate that doing so does not affect site storm water management systems.
Option 2. No Potable water use or irrigation
Meet the requirements for Option 1.
Use only captured rainwater, recycled wastewater, recycled gray water or water treated and conveyed by a public agency specifically for non-potable uses for irrigation.
Install landscaping that does not require permanent irrigation systems. Temporary irrigation systems used for plant establishment are allowed only if removed within 1 year of installation.
Potential technologies & Strategies
Perform a soil/climate analysis to determine appropriate plant material and design the landscape with native or adapted plants to reduce or eliminate irrigation requirements. Where irrigation is required, use high-efficiency equipment and/or climate-based controllers.
Effective rainwater collection: 11,442 m3 (whole years)
Average irrigation demand in dry day: 979 (whole years)
=> Don't need potable water for irrigation
=> To promote landscape designs which incorporate native species and limit the use of domestic water for irrigation.