Inventorying existing facilities is often the first step in system modernization and capital improvement planning. We employ a range of open source mobile data collection tools to streamline the workflow of field data collection, storage, analyses, and visualization. Davids Engineering offers services for facilities mapping, infrastructure inspections, as-built survey preparations, bathymetric surveys and more. We use a combination of Real Time Kinematic (RTK) GNSS survey instruments for extensive surveys and water survey elevation profiles, together with laser and optical levels for precision leveling over shorter distances.