DSLLC is a small, woman-owned water resources, environmental science and engineering firm founded in 1996. We offer a range of water resource engineering, computer modeling, environmental, scientific, and data management services needed for resolving complex water resource problems. Headquartered in Knoxville, TN, we maintain a strong representation in the disciplines of civil, hydrologic/hydraulic, coastal and environmental engineering; hydrologic, hydraulic, hydrodynamic, sediment transport and water quality modeling; data management and statistics; geographic information systems (GIS), and computer programming. In addition to excellent technical engineering and numerical modeling credentials, DSLLC’s staff has a thorough understanding of applicable environmental regulations, data collection and processing methods, and database/software development methods. We specialize in development of innovative applications of 1, 2, and 3-dimensional hydrologic, hydraulic, hydrodynamic, sediment transport, groundwater flow, and water quality computer models. In addition, we are experience in using geographic information systems (including ESRI ArcGIS) as the integration platform for watershed and environmental assessments.

Our staff have managed, planned, and conducted water resource studies in rivers, streams, lakes, reservoirs, estuary and coastal environments in the USA, Nova Scotia and Southeast Asia. DSLLC has designed focused hydrologic and hydraulic data collection and monitoring programs, developed protocols for properly performing field studies, and performed terrestrial and aquatic investigations to provide defensible data for federal, state, and local government agencies as well as private industrial and legal firms.

DSLLC strives to exceed client expectations and deliver results on schedule and within budget. This is accomplished by combining our experienced senior-level scientists/engineers with state-of-the science computer modeling and data analysis tools. We apply existing models when appropriate yet have the capability to develop new modeling tools when that approach offers a more cost effective, informative, and scientifically defensible solution. Our staff members have an average of 28 years of experience in their respective fields of expertise and a commitment to advancing the scientific and engineering practices used in water resources management and numerical modeling studies.

DSLLC has developed specialized experience in the following key technical areas:

• Hydrodynamic studies and modeling of estuaries, rivers, lakes, reservoirs and coastal environments using EFDC, CH3D, TABS.
• Sediment transport studies and modeling of rivers, lakes, reservoirs, estuaries and coastal environments using EFDC, TABS, HEC-6, GSTARS, AGNPS.
• Water quality modeling using EFDC, WASP 7.3, QUAL2E, CE-QUAL-W2, CORMIX, and CE-QUAL-RIV and wet-weather monitoring and data analysis.
• Hydrologic studies and modeling using HEC-1, HEC-HMS, TR20, SWMM, ICPR, HSPF and AGNPS.
• Hydraulic studies and modeling using HEC-2, HEC-RAS, UNET, FESWMS.
• Coastal and inland hydrologic and hydraulic data collection and analysis including USACE Sediment flume (Sedflume) and Acoustic Doppler Current Profiler (ADCP) studies, wave, water level and current measurements, shoreline surveys, instrument deployment and discharge measurements.
• Navigation studies.
• Comprehensive watershed management plan development.
• Statistical analysis and information management.
• GIS development using ESRI ArcGIS.
• Computer programming.
• NPDES analysis and support.
• Database design and development.
• Environmental services
• Operational Readiness Reviews/Readiness Assessments