Prevost Stamper Inc. (PSI) is a landscape architecture firm with roots in Memphis, providing professional irrigation design services for other landscape architects since 1987. PSI has wide range of clients that bring a variety of projects across Tennessee and beyond.

Beal Street Landing

 
Above & Left: PSI worked with Memphis landscape architects Ritchie Smith and Lissa Thompson at Ritchie Smith Associates to develop the irrigation design for the Beal Street Landing Park. Beal Street Landing is adjacent to Tom Lee Park, home of the famous Memphis in May World Championship Barbecue Cooking Contest. The park serves a diverse community of visitors and functions as a viewing platform, day use park and steamship port. Specification and location of landscape features and subsequent irrigation equipment were key design elements allowing for the rising and falling Mississippi River. Above the river flood elevations, the visitor center has a turf covered green roof that is sloped to grade on two sides of the building. Accessible to pedestrians, the green roof required a unique irrigation design solution. Irrigation mainlines and valves were placed at the foot of the roof slopes with lateral lines and heads ran up the roof slopes. Hunter MP Rotator nozzles were selected for the green roof because they have lower precipitation rates to minimize runoff on the slope, and good application uniformity in windy and exposed conditions.

FedEx World Headquarters
Above: In 1985 PSI's founder, Michael Prevost, worked as an irrigation installer at the original FedEx World Headquarters site near the Memphis International Airport. That project included one of the first central satellite irrigation control systems, the WeatherMatic Mark II. Years later Michael was asked by SWA in Dallas to design the irrigation system at the new FedEx Headquarters and World Tech Center outside of Memphis in Collierville, TN.
The new irrigation systems use Rain Bird Site Control central control systems to manage the irrigation schedules for water conservation. West Tennessee has high quality ground water. The ground water travels through sand layers the length of the state from the Appalachian foothills to the Mississippi River basin. Recently, the West Tennessee and North Mississippi aquifers have shown signs of stress making landscape irrigation and water conservation a priority in the region.

Centennial Park
Left: Centennial Park is a 132-acre public park in Nashville and is home to the Parthenon built for the 1897 Tennessee Centennial Exposition. Local landscape architects Richie Jones and Chris Barkley at HDLA partnered with Thomas Woltz and Joey Hays at Nelson Byrd Woltz to design multiple park renovation projects. PSI began irrigation master planning and phased redevelopment at the park in 2016. The first project was the 5-acre Musicians Corner where PSI designed a cistern and pump system to collect spring water for the landscape irrigation system and an interactive spring water feature. Previously, the spring water was unused and discharged to a storm drain.
More recent renovations include the Great Lawn, the Parthenon Area and the Children's Memorial Garden. All irrigation systems in the park are supplied by pump stations and distribution pipe systems using spring and storm water primarily, and potable water in times of drought. Irrigation is controlled by a Toro Sentinel central control system with flow sensing and flow management features operated by Nashville Metro Parks staff.