The Hydrotech Hydrology Tool (HHT) is designed to provide members of the design team with full, project-specific reporting that documents how a green roof assists in meeting overall stormwater requirements and goals. The HHT reportedly aggregates project component performance data, integrates project-specific municipal/LEED guidelines and then overlays a variety of retention and detention abilities. The analysis calculates how a Garden Roof Assembly affects stormwater runoff volumes, the rate at which it slows water that does run off and the potential for LEED compliance. www.hydrotechusa.com