Identifying where creeks and rivers gain flow from groundwater can be difficult, and can directly impact remediation decisions.  Temperature can serve as a tracer to locate such seeps. SelkerMetrics deploys both fiber optic temperature sensing (DTS) and precision logging thermometers for this purpose, and offers proprietary post-processing, data analysis, and results interpretation to guide site characterization.  The choice of deployment and measurement methods are determined by details of the site, including bed substrate, navigability, flows, underlying geology, and climate.