The Laboratory, which has been in service since 1970, covers an area of approximately 11,000 square feet. The facilities available in the laboratory consist of several flumes, a rainfall generator, a stratified flow tank, and a water tunnel. A set of twin volumetric tanks is also available for calibration of flow metering devices. Measuring equipment includes an assortment of current meters, sediment concentration and conductivity probes, a laser-based flow visualization system, a high-speed video camera, and personal computers and workstations for in-situ data acquisition and analysis. Members of VTCHL also have access to NCSA's powerful computational facilities.