2020 Winner: Offices at Santa Clara Square

Offices at Santa Clara Square

Santa Clara, CA – Honor Award, Commercial and Public Works – Large Projects


Steve Hohl, Water Concern, Ltd.


  • Large commercial technology campus that is a part of a larger development consisting of apartments, retail and the office campus
  • The landscape area is 15.1 acres and includes streetscapes, medians, volleyball courts, basketball courts, relaxing spaces, large existing and newly planted specimen trees, outdoor amenity spaces, and spacious open event lawns
  • The irrigation system utilizes a combination of spray and inline drip irrigation
  • Tree irrigation systems are isolated by species, each with its own control valve to accommodate differing water requirements
  • The irrigation system consists of 13 weather-based ET controllers with advanced irrigation parameter programming
  • Basket strainer filtration and master valve assemblies filter and control mainline pipe flow with sensor technology to monitor for high or low flows
  • Fertilizer injection assemblies are utilized at each point of connection to allow micro-dosing of nutrients as needed
  • Master planning irrigation services for the entire project
  • Irrigation design / construction documents
  • Redwood blending system coordination, design and drawings
  • Specifications
  • Controller programming parameters
  • LEED calculations and documentation
  • Bid and RFI support
  • Observation and subsequent reports during and after construction. The project involved seven visits
  • It was essential that the existing Sequoia (Redwood) trees within the property be preserved
  • It was a goal to meet LEED Gold; the outdoor water use efficiency credit was required to reduce potable water use by 50% from the baseline (2 points) and utilize recycled water to further reduce potable use (2 points.) Achieving both would earn the maximum possible four points
  • The City denial to irrigate only the Redwoods with potable water due to the sensitive public awareness of the ongoing drought

Dripline layout during construction

  Healthy Redwoods




View of landscape and amenities



Potable water supply assembly with protective enclosure. Access hatch to blending tank appears in front

     Aerial view during construction

 Supply pipe with laminar flow   nozzle and air gap

Blending tank prior to backfill


Blending assembly during construction