Founded in 1991, JDA is an industry leading specialist water resource and hydrological consultancy based in Perth, Western Australia, providing services to urban, rural and remote areas in the fields of: - Urban Water Management - Water Resources Planning & Management - Surface Water Hydrology - Groundwater Hydrology - Environmental Hydrology Our past projects include Reservoir storage assessments, Water management plans, water monitoring and reporting. Visit our Projects Page to see a full history. Wholly Western Australian owned, JDA's professional staff include specialist Civil and Environmental Engineers as well as Environmental Scientists. Our five senior staff have over 120 years experience in hydrology and hydrogeology.