From the U.S. Geological Survey (USGS):

The NWDTW is an annual event that provides training and workshops for USGS hydrologic technicians, hydrologists and others who collect, analyze, and process water data. This training is sponsored by HDAC, whose mission is to improve USGS hydrologic data operations. The training workshop also provides a forum for commercial vendors to introduce themselves and showcase their products within a dedicated exhibition hall. 

Stop by the Campbell Scientific booth, #113-115.