Study, Protect, Improve and Manage Water Dependent Eco Systems


Who is on the cbec team?

cbec prides itself on the extensive level of practical and academic experience held by its staff and management. You will find short profiles below this summary of our staff members:

Team Members


Chris Bowles, PhD, PE

Founder, President

Chris is a registered civil engineer (CA P.E. C76898) specializing in hydraulics, hydrology, geomorphology, water resources, water quality and environmental restoration. He has over 19 years of project management experience on a wide variety of large multi-disciplinary, multi-stakeholder projects such as floodplain restoration, sediment studies, watershed hydrology, water quality, river and wetland restoration in California, Nevada, Washington, Oregon, and Florida, and oversees, including projects in the UK and Central America. Thirteen of these years have been spent in practice in the US. His technical expertise spans the range of hydraulic and hydrologic modeling (HEC software and a wide variety of 1D, 2D and 3D hydraulic models), geomorphology, GIS and field data collection (topographic and bathymetric surveying, water quality monitoring, flow gauging and sediment transport measurements). Prior to specializing in environmental hydrology, Dr. Bowles worked initially as a land surveyor and latterly as a site construction supervisor. Dr. Bowles has a doctorate in computational fluid dynamics in the application of fluvial hydraulics and has constructed numerous 1-, 2-, and 3-dimensional hydrodynamic models over his 19 years of experience in environmental engineering.

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Chris Campbell, MS

Vice President

Chris has more than 15 years of engineering and project management experience with an emphasis in ecohydraulics and ecohydrology. He specializes in hydrodynamics, physical hydrology, sediment transport, geomorphology, water resources, and ecosystem restoration. His technical expertise routinely involves the application of GIS and computational models (e.g., 1D, 2D, and 3D), both public (e.g., HEC software) and proprietary (e.g., MIKE software), to inform a range of water resource and environmental assessment and restoration projects within riverine, estuarine, and wetland environments. Mr. Campbell also conducts field studies (e.g., topographic and bathymetric surveying, water quality monitoring, climate monitoring, flow gauging, sediment characterization, and sediment transport sampling) and uses the data to characterize site conditions and to develop, calibrate, and validate computational models. He is an expert in hydrology, hydraulics and sediment transport and has constructed numerous such models over the last ten years. Mr. Chris Campbell is currently studying part-time for a doctorate in Civil Engineering at the University of Idaho with a special emphasis on vernal pool hydrology. As part of that research, he is using three years of monitoring data at two restoration sites to calibrate and validate a shallow vadose zone model using HYDRUS 3D. The model will then be used to evaluate the potential hydroregime effects of constructed pools on natural pools and develop hydrologic criteria to inform habitat conservation and enhancement design.

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Christopher Hammersmark, PhD, PE


Chris is a registered civil engineer (CA P.E. C66595) specializing in hydraulics, hydrology, geomorphology, water quality, ecology, and ecosystem rehabilitation/restoration. He has over 15 years of experience on a diverse array of projects including sediment and water quality studies, river and floodplain restoration, flood inundation and water supply investigations. The environmental settings for these projects range from natural to urban, from the tidally influenced Bay-Delta through lowland alluvial rivers to headwater streams and adjacent meadows and forests. Dr. Hammersmark’s technical experience includes numerical hydraulic and hydrologic modeling (e.g., HEC, USGS, USBR and DHI models), habitat suitability modeling, terrain modeling, GIS and a variety of types of field investigations including sediment characterization and sediment transport measurements, water quality sampling, flow gauging, groundwater sampling, water table measurement habitat characterization and mapping, vegetation sampling, topographic and bathymetric surveys, soil infiltration and compaction monitoring. Dr. Hammersmark's dissertation research involved developing an integrated surface water-groundwater model to establish a water budget for a wetland system, providing spatial and temporal estimates of storage and flux though the surface-subsurface system. Drawing from his diverse academic and consulting background, Dr. Hammersmark seeks innovative and sustainable process-based solutions to complex multi-objective water resource and ecosystem restoration challenges, while operating within the specific constraints of each project. He is committed to the conservation, preservation and rehabilitation of aquatic, wetland and terrestrial ecosystems.

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Hamish Moir, PhD

UK Managing Director

Hamish has over twenty years experience working in the water resource industry in the UK and the US, particularly in the areas of salmonid physical habitat characterisation, catchment management and river restoration. He has extensive training in the fields of fluvial geomorphology-instream ecology interactions and river engineering, both in research and consultancy capacities. The three years he spent working in the USA provided valuable training in river restoration strategies, hydrodynamic modeling and state-of-the-art surveying methodologies. Hamish has considerable experience in project management, initially in the delivery of large academic research projects and, since joining cbec, leading many consultancy assignments. In his previous post as a senior research scientist with the Macaulay Land Use Research Institute, Catchment Management Group he led an international workshop on ‘Defining Hydromorphological Condition and Links to Ecology’ (March, 2009).

Dr. Moir has been active in promoting more sustainable approaches to river restoration, managing a pilot project on the Tarland Burn, Aberdeenshire and recently co-authoring a high profile paper on the new concept of ‘process-based restoration’. He has also been project manager on many consultancy projects involving fisheries, river management and restoration. Recently he has worked on large catchment restoration projects on the River Naver, Sutherland and the Eddleston Water, Scottish Borders, both balancing the requirements of sustainable flood management and improved ecological function.

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Alexis White, BA, Operations and Safety Manager

Alexis' responsibilities include operations, human resources, health and safety, administration planning, marketing, project management and the business office.

Alexis is an experienced manager with over 8 years of project management and operations experience. Alexis graduated from the University of California, Santa Barbara with a Bachelor’s degree in Communication. Her previous experience is in the construction & erosion control industries. Alexis joined the cbec team as our Operations & Safety Manager. Alexis is responsible for the overall operations within cbec including the day to day operations in the office, communication, event planning, human resources, staffing & recruiting, developing and managing our operations manual and safety program, and training & continuing education for our staff.

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Toni Howe, Business Office Manager

Toni is a skilled manager and bookkeeper with over 15 years of experience. She attended American River College and has been a licensed QuickBooks Professional Advisor for over 10 years. Her previous accounting experience makes her a great fit for cbec. Toni is cbec’s Business Office Manager. She is responsible for invoicing, accounts receivable, accounts payable & payroll. Toni also acts as a liaison between cbec and our CPA. She handles the accounting for the US and UK offices. Toni is one of cbec’s original staff members.

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April Sawyer, MS

April has six years of experience in fluvial geomorphology, hydraulic modeling, and aquatic biology with an emphasis on river restoration. April completed a M.S. degree in Geosciences at the University of Montana, with a focus in fluvial geomorphology. April's diverse experience ranges from large-scale hydroelectric relicensing and salmonid restoration in gravel-bed rivers in the Sierras and Rocky Mountains, to tidal channel and floodplain restoration across California and the Pacific Northwest. April has extensive experience utilizing 1D and 2D models for urban floodway enhancement, flood attenuation and habitat benefits of levee setbacks and breaches in rivers and tidal wetlands, habitat suitability optimization, and geomorphic processes. She has extensive field experience including topographic surveying, flow and velocity measurements, geomorphic mapping and some experience in biological population sampling for fish and amphibians. In her research, April has investigated constraints on restoration design-channel feature construction, relation of velocity reversals at high flows to channel maintenance, and effects of flow magnitude and duration on chute cutoffs.

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Ben Taber, BS, PE

Ben has an extensive background in Civil Engineering with practical experience in hydraulics, hydrology, hydrodynamics, geomorphology, flood management, water quality, and sediment transport. His technical expertise includes Civil 3D, Land Desktop, HEC-RAS, HEC-HMS, and ArcGIS. In addition, Ben is well trained in field data collection practices and techniques, including use of ADCP (Acoustic Doppler Current Profiler) discharge and velocity measurements, multiple sediment sampling events consisting of bed load, suspended sediment and grab sampling, bathymetric surveying, and total station channel surveying.

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Dale Meck, MS

Dale graduated from Cornell University with a B.S. in Civil & Environmental Engineering (Magna Cum Laude), followed by an M.S. in Environmental Fluid Mechanics & Hydrology from Stanford University. Since then he has spent over 8 years working in many diverse areas of hydraulic and hydrologic engineering from master planning to final design and construction observations. His diverse experiences range from operating a waste water treatment plant, to driving/operating a backhoe, to complex 3D surface modeling in AutoCAD Civil3D. He is known to occasionally test out his understanding of various fluid flows and hydraulics by working as a seasonal raft guide in Alaska. Dale enjoys working with other professionals to find cost-effective solutions to interesting and unique environmental challenges.

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Denise Tu, MS

Denise has more than 5 years experience in aquatic ecology, fluvial geomorphology, hydrology and water resource engineering. Denise graduated from University of California, Davis with a B.S. in biological systems engineering, and went onto finish her M.S. in geography with an emphasis in fluvial geomorphology and GIS at the University of Oregon. She has been involved in several different river restoration research projects including monitoring riverbed and channel form changes in response to restoration efforts on the Middle Fork John Day, OR and spatial analysis for Chinook salmonid habitat suitability assessments on the Lower Yuba River, CA. Prior to cbec, Denise lived and worked in Hawaii where she helped manage instream flows standards on perennial streams. Denise now calls Santa Cruz home. She has shown a unique ability to work with many different people (and personalities) and is a very talented, hard-working member of the cbec team.

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F. Douglas Shields, Jr., PhD, PE, D.WRE

Doug is a registered civil engineer (MS P.E. 08360) specializing in hydraulics, geomorphology, water quality and restoration of freshwater aquatic and riparian habitats. He has over thirty-six years of research and engineering experience on a wide variety of projects involving stream habitat restoration, water quality, stream ecology, and protection of cultural resources. He is an international leader in river restoration research and practice. Areas of special interest include backwater management, large wood, effects of vegetation on levee reliability, response of fluvial systems to disturbance, impacts of agriculture on water quality, and environmental design criteria for river engineering. He has worked on research or consulting projects in all major regions of the Continental US, with primary experience in the Southeast. Doug has authored or co-authored more than 270 technical publications and has made more than 100 technical presentations.

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Jai Singh, BS

Jai Singh has over 5 years of experience in hydrology, fluvial geomorphology, water quality and ecosystem restoration. He specializes in river restoration, geomorpology studies, interdisciplinary watershed assessments, and hydrodynamic modeling. He has worked on ecosystem rehabilitation projects in a range of river and wetland settings in northern California, the mid-Atlantic and Florida. Prior to joining cbec, Jai investigated stream and wetland restoration from the reach to the landscape scale with a specific emphasis on the interplay of geomorphic, hydrologic and ecological processes. He has also studied the effects of regulations and funding mechanisms on stream restoration design and site selection. Jai attended Duke University for his bachelor's degree where he developed his own major: Environmental Engineering and Ecological Restoration. His technical expertise includes hydrodynamic modeling, GIS, fluvial geomorphology and field data collection (surveying, water quality monitoring, process-based geomorphic assessments, and flow gauging and characterization).

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John Stofleth, MS, PE

John has more than 9 years of experience in hydraulic engineering, fluvial geomorphology and watershed ecology. John has worked on a myriad of projects that included the development of one- and two-dimensional hydrodynamic and sediment transport models. Additionally, he has performed extensive watershed scale hydrologic and geomorphic assessments. He is adept at evaluating and implementing projects that require complex hydraulic and geomorphic solutions. John has also been involved in several research projects that embody new trends in the field of stream restoration including the effects of dam removal on channel morphology, the analysis of large wood as a tool in stream restoration, and the importance of hyporheic exchange in overall stream integrity. His multidisciplinary background and experience involving projects with multiple components of the river system make him an invaluable member of the cbec team.

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Jon Pasrons, MS

Jon completed his B.S. in biology at the University of California, Santa Cruz before pursuing an M.S. in civil engineering at San Jose State University. His graduate studies focused on topics such as hydrology, hydraulics, and sediment transport. Since entering the field of water resources as a professional, Jon has been involved primarily in fish passage improvement, environmental rehabilitation, and erosion control projects. His scope of work on these projects includes initial fieldwork, hydrologic analysis, hydraulic modeling, drafting and design, and record surveys. Jon’s software experience includes AutoCAD Civil 3D, HEC-RAS, and ArcGIS. Jon also has substantial experience with total station and GIS survey equipment.

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Kevin Coulton, MS, PE, CFM

Kevin is a water resources engineer with over 28 years of experience in hydraulic engineering and hydrology, including riverine and coastal flood studies in the Pacific Northwest for FEMA and state and local governments in Washington, Oregon, Idaho, California, and Montana. He has also conducted projects at regional and national levels, including GIS analyses of the entire United States to assess national flood risk, and has been involved with international aspects of flood risk and ecosystem restoration. He is responsible for business development, technical advancement, and quality control for water resource clients and products.

Mr. Coulton’s project experience and capabilities include stormwater management, water supply investigations, coastal and river flood risk and floodplain evaluations, fluvial geomorphology, reservoir operations, river engineering investigations, fish passage and fisheries habitat restoration, NPDES stormwater permitting and public education for storm water pollution prevention. He has experience with the following software packages: HEC-1, HEC-HMS, HEC-2, HEC-RAS, SWMM, TR-55, TR-20, WSPRO, HSPF, FLO-2D, MIKE-11, BREACH, and ESRI’s GIS software suite.

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Luke Tillmann, MS

Luke completed his B.S. in Environmental Sciences, with minors in GIS and Forestry, at the University of California, Berkeley before continuing to UC Davis for a M.S. degree in Hydrology. For his Master's thesis, he modeled 3-dimensional circulation patterns in Englebright Lake to estimate streamwood flux dynamics through the Yuba River watershed in California. He has also worked extensively in the Colorado Rocky Mountains studying climate-driven altitudinal shifts in alpine plant communities through remote sensing, geospatial modeling, and field work. In terms of software, he has primarily used Delft3D, the HEC model suite, and ArcGIS, but is familiar with AutoCAD and other models such as IWFM. To balance all of the time Luke spends on a computer, he enjoys camping, hiking, whitewater rafting, cycling, and swimming.

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Matt Weber, MS, EIT

Matt has a dual B.S. degree in Civil Engineering and Environmental Studies from University of Wisconsin, Madison and an M.S. degree in Hydrologic Sciences from University of California, Davis. Matt brings a diverse background in engineering, hydrology, and restoration ecology. He has three years of experience leading large-scale plant community restorations for the Madison Audubon Society in Wisconsin and over three years of research experience working with rivers. For his M.S. thesis, Matt developed a novel method for improving uncertainty estimates in digital elevation models in order to analyze fluvial topographic change and calculate sediment budgets. He has extensive experience working with LiDAR and multi-beam sonar data, analyzing spatial data in ArcGIS, LAStools, and R, and developing 2-dimensional hydrodynamic models in SRH-2D.

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Nathan Cheshier, MS

Nathan’s diverse background includes three years of geotechnical consulting and a stint in Europe where he obtained an M.S. in Sedimentology from the University of Utrecht in the Netherlands. It was in the Netherlands that Nathan became well versed in physical and numerical modeling using programs such as SOBEK and Delft-3D. For his thesis Nathan constructed and ran a physical model to study the effects of varying initial sediment concentration on the internal structure of turbidity currents. Nathan also has experience in ArcGIS as well as various technical instruments and field data collection techniques. Nathan is excited to be back in the US as a member of the cbec team.

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Rafael Rodriguez, BS

Rafael has over 4 years of experience in fluvial geomorphology, water quality, and hydrogeology. Rafael recently graduated from University of California, Davis with a B.S. in Hydrology where he was first introduced to GIS and 2D hydrodynamic models. Since then, he has continuously strived to increase his skillset to include field data collection, HEC-RAS 1D modeling, SRH-2D modeling through the SMS interface, HEC-EFM statistical analysis, and implementing Ground Penetrating Radar. He has applied his multidisciplinary background to investigate flood management practices, salmonoid habitat conservation, and surface-groundwater interactions. Rafael is eager apply his experience and strong work ethic to explore the intricate hydrologic sciences field as part of the cbec team.

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Rusty Barker, MS, PE

Rusty Barker joined the hydrology and water resources field in 2009. He graduated from the University of California, Davis with an M.S. in Hydrologic Sciences (2012) and a B.S. in Civil Engineering (2009). He completed his M.S. thesis building, calibrating, validating and applying large scale, two-dimensional hydraulic models of the Lower Yuba River. He has extensive experience in the field collecting data, performing topographic surveys, while being an effective team member and leader. Rusty is also a skilled multi-rotor UAS (drone) pilot which he utilizes to map and survey project sites. His hydraulic modeling skills and geo-spatial understanding are accompanied by a proficiency in ArcGIS, SMS v11, SRH-2D, Excel, MIKE-21C, RMA2, VBA, Fortran, HEC-DSS, HEC-RAS, and Python. Rusty brings his multidisciplinary background of hydrology and civil engineering along with a strong work ethic to the cbec team.

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Sam has 14 years of experience that covers a wide range of civil engineering projects. With cbec, he has been involved in hydromodification studies related to land development, reservoir sedimentation studies, river floodplain connectivity and levee setback studies, and salmonid habitat restoration. He is well versed in designing, creating and preparing construction documents, project permitting, and construction monitoring and surveying. Mr. Diaz is familiar with a variety of hydrologic and hydraulic modeling software packages. He is experienced in performing hydraulic analyses to evaluate natural and man-made channel flow, as well as to inform the design of both gravity and pressurized piping systems. He has worked on projects related to land development, water and wastewater treatment and infrastructure, water resources management and planning, and hydroelectric generation in the past.

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Tobin (Toby) Stegman, MS

Toby has over four years experience working in the water resources field. He has a master’s degree from the University of Wyoming focusing on fluvial geomorphology and remote sensing, and an undergraduate degree from the University of Vermont in environmental geology. His thesis research used new photogrammetric methods (Structure-from-Motion) for monitoring a stream restoration project in Eastern Idaho. He has experience with HEC-RAS, FaSTMECH 2D model, Program R statistical programing language, ArcGIS, and Matlab. Toby also has brings a wide range of field work experience to cbec. This experience spans from RTK GPS and total station surveying, and stream flow gauging, to UAS (drone) and RC boat mapping. He has also provided field assistance for several remote sensing image acquisitions, where hyperspectral images and LIDAR data were collected.

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William L'Hommedieu, MS

Will has over 2 years experience in hydraulics, hydrology, and fluvial geomorphology. Will recently graduated with an M.S. in Water Resources Engineering from Oregon State University. Will has experience in 2D hydrodynamic modeling for his masters thesis examining the effects of an engineered log jam on habitat and bank stability in the Willamette Valley. He also has experience working with HEC-RAS, GIS, and performing fish passage analyses. Will has performed topographic surveys as part of his research and has conducted habitat assessments in the Mt. Hood National Forest working for the United States Forest Service. Will is excited to join the CBEC team and apply his skills to exciting environmental challenges.

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cbec... competent staff

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