His research has concentrated on water systems in South Asia and the US from the site to river basin scales. For the greater part of his career, Professor Wescoat has focused on small-scale historical waterworks of Mughal gardens and cities in India and Pakistan.
He led the Smithsonian Institution's project titled, "Garden, City, and Empire: The Historical Geography of Mughal Lahore," which resulted in a co-edited volume on Mughal Gardens: Sources, Places, Representations, Prospects, and The Mughal Garden: Interpretation, Conservation, and Implications with colleagues from the University of Engineering and Technology-Lahore. These and related books have won awards from the Government of Pakistan and Punjab Government.
The overall Mughal Gardens Project won an American Society of Landscape Architects national research merit award, as did a project on The Moonlight Garden: New Discoveries at the Taj led by Elizabeth Moynihan. This work has been generously supported by fellowships from Dumbarton Oaks, the Freer and Sackler Galleries of Asian Art, and the American Academy in Rome.
In 2002, Professor Wescoat became head of the Department of Landscape Architecture at the University of Illinois at Urbana-Champaign where he taught courses on "Landscape Experience, Inquiry and Design," the "Theory and Practice of Landscape Architecture," and design studios on urban ecological design in Chicago. Together with colleagues and students at the University of Illinois he contributed to a cultural landscape heritage conservation project at the Champaner-Pavagadh World Heritage Site in Gujarat, India, for the Baroda Heritage Trust.
More recently, he has organized a garden and waterworks conservation workshop at the Nagaur palace-garden complex in Rajasthan for the Mehrangarh Museum Trust; and a workshop on the "Three Shalamar Baghs of Delhi, Lahore, and Srinagar" with colleagues from those cities.
At the larger scale, Professor Wescoat has conducted water policy research in the Colorado, Indus, Ganges, and Great Lakes basins, including the history of multilateral water agreements. He led a USEPA-funded study of potential climate impacts in the Indus River Basin in Pakistan with the Water and Power Development Authority (WAPDA). More recently, he led an NSF-funded project on "Water and Poverty in Colorado." He is currently conducting comparative research on international water problems.
In 2003, he published Water for Life: Water Management and Environmental Policy with geographer Gilbert F. White (Cambridge University Press); and in 2007 he co-edited Political Economies of Landscape Change: Places of Integrative Power (Springer Publishing) for LAF Landscape Futures Initiative.