RSW provides services to clients in key end markets, including hydro power and transmission and distribution.
AECOM president and CEO John Dionisio said that welcoming RSW into the AECOM family enables it to expand the growth opportunities for both companies.
RSW generated approximately $45m of gross revenue in the 12 months ended 30 November 2009.
AECOM expects the transaction to be accretive to cash earnings per share in fiscal year 2011.
