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| Related Projects |
 Humboldt Watersheds |
| PWA Speaking Engagements |
| Contact a Specialist fieldservices@pwa-ltd.com |
| "Andy [Collison's] exceptional presentation today really stimulated discussion and made the Grizzly Slough Ecological Science Panel meeting a success." - Collette Zemitis Staff Environmental Scientist Flood Management, North Delta Programs California Department of Water Resources |
PWA provides a range of other services, including surveying, field data collection and monitoring, and review of scientific and planning documents.
Accurate field data collection and analysis is critical to planning and designing successful restoration and mitigation projects. PWA’s in-house field services personnel perform a range of data collection and analysis programs that supports projects from the initial site survey through post-project monitoring.
Surveying
Our field staff works closely with engineers, hydrologists, modelers, environmental planners and regulatory agencies to provide topographic and shallow-water bathymetric surveying within a variety of challenging fluvial, tidal and coastal settings. Total station, tide gages, GPS and echo-sounding surveying techniques, PWA can measure and analyze river channel cross-sections, thalweg profiles, marshplain transects, tidal pond and lagoon bathymetry, beach profiles and water surface elevation. Computer models, floodplain studies, GIS and AutoCAD drawings rely on accurate field data. The data is carefully collected and analyzed in conjunction with our quality control program. PWA also provides as-built surveys of newly constructed restoration projects and post-project monitoring to evaluate project performance and to allow adaptive management.
Monitoring
Field efforts frequently require the combination of automated instrumentation and geomorphic assessment techniques. PWA utilizes a variety of monitoring equipment and techniques to collect data regarding water quality, dissolved oxygen, salinity and temperature; the measurement of sediment loads in fluvial, coastal and estuarine environments; flow depth, velocity, turbidity, suspended sediment concentration and bedload; derivation of sediment rating curves; tide and wave heights; and the measurement of soil properties, including permeability, particle size distribution and water table depth.