Donner Basin Watershed Assessment

Erosion Hazard Analysis Floodplain and channel restoration concept graphic for creek confluence cbec, joined by a consulting archaeologist and ecologists, conducted a watershed assessment of the Donner Basin, a 29.5 square-mile sub-watershed within the Truckee River drainage located just east of the Sierra Nevada crest. As a major transportation corridor, recreation destination, water supply source and population center, the Donner Basin experienced numerous environmental impacts

American River Parkway Cordova Creek Naturalization

cbec provided restoration/rehabilitation design services for Cordova Creek. Our approach to habitat restoration design and planning included three co-equal goals of the project: habitat quality, aesthetics, and functionality. Multiple stakeholders are involved with this project, including Regional Parks, County DWR, The Water Forum, SAFCA, Rancho Cordova, Soil Born Farms, and the CNPS.

Lower American River – Temperature Refugia, Temperature Monitoring, and On-Call Support

Trimaran setup for temperature mapping Example of temperature mapping cbec has provided temperature and stage monitoring on the Lower American River (LAR) since 2008. In continued support of this effort, cbec was contracted by the Water Forum to continue the temperature monitoring effort through 2017. In addition to the ongoing monitoring through the whole 23 miles of the LAR, cbec also performed temperature mapping of

Butano Creek Floodplain Reconnection and Restoration Design and Monitoring

Engineered log jam in channel supports floodplain reconnection on left bank where berm was removed.Simulated floodplain inundation for a 2-year event for pre-project and post-project conditions.Unsteady 2-dimensional floold simulation of Butano Creek, San Mateo County, California. cbec developed designs, directed construction, and conducted post-project monitoring of a project that reconnected an incised reach of Butano Creek, a tributary to Pescadero Creek, to its adjacent floodplain.

Sacramento River East Levee Erosion Repair Design Assistance

Erosion Repair Site Survey in Sacramento River Erosion Repair Site Survey Transect The Sacramento Flood control Agency (SAFCA) is undertaking a project to repair nine erosion sites on the Sacramento River east levee. Levee repairs will provide a 200-year level of flood protection while adding ecological value to the riverbank. cbec is providing design assistance that includes coordinating data collection efforts and advising repair designs.

Prospect Island Tidal Restoration Project

Tules surrounding a tidal channel in the Cache Slough Complex Snapshot of model mesh and bathymetry The Cache Slough Complex is located within the Legal Delta, California. cbec previously developed a 2D hydrodynamic model for the Solano County Water Agency (SCWA) using the MIKE 21FM modeling platform (Danish Hydraulics Institute, DHI 2011) to assess potential dissolved organic carbon (DOC) impacts at the Barker Slough Pumping

Raccoon Creek Watershed Assessment

Survey reach characterized by fluvial auditSpecific Stream Power analysis from the geomorphic assessment.Rendering of a conceptual design for a fish ladder and fish screen associated with a fish passage barrier and unscreened diversion on Doty Ravine.Example fluvial audit data.Engineering and Land Use Pressure Index. The County of Placer (County) tasked cbec to lead a project team for a multi-disciplinary assessment of the Raccoon Creek watershed.

Low Impact Development Guidebook Preparation, Placer County

Placer County LID Guidebook Fact Sheet cbec partnered on a team led by Placer County to develop a Low Impact Development (LID) guidebook for Placer County. The project was funded by the Sierra Nevada Alliance; cbec worked with the Sierra Business Council and CKB Consulting in development of the guidebook. The purpose of the guidebook was to provide guidance on the use and implementation of

Santa Clara River Estuary Habitat Restoration and Enhancement Feasibility Study

This project aims to explore the feasibility of expanding and enhancing estuarine habitat for steelhead and other native and protected species within the McGrath State Beach Campground. The Santa Clara River Estuary Habitat Restoration and Enhancement Feasibility Study was developed through the support of the California Department of Fish and Wildlife, the U.S. Fish and Wildlife Service, California State Parks, and the Wishtoyo Foundation’s Ventura Coastkeeper Program to explore the feasibility of expanding and enhancing estuarine habitat for steelhead and other native and protected species by restoring up to 40 acres of the estuary by providing lagoon, side channel, contiguous wetland, and/or additional upland riparian habitat in the area currently occupied by the McGrath State Beach Campground.

Yolo Bypass Salmonid Habitat Restoration and Fish Passage Project EIS/EIR

The Yolo Bypass Salmonid Habitat Restoration and Fish Passage Project is a collaboration between the Bureau of Reclamation and California Department of Water Resources, that aims to provide seasonal inundation that mimics the natural process of the floodplain and improves connectivity within the Yolo Bypass and to the Sacramento River.

Independent External Peer Review (IEPR) of the Sutter Basin Pilot Feasibility Study

cbec was selected to participate on the Independent External Peer Review (IEPR) Panel of the Sutter Basin Pilot Feasibility Study, Sutter Basin, California: Draft Feasibility Report – EIS/EIR, as a subcontractor to Battelle. cbec provided Hydrology & Hydraulics review in accordance with procedures described in the USACE, Civil Works Review and the Office of Management and Budget Final Information Quality Bulletin for Peer Review. cbec

Dry Creek Habitat Enhancement Project

cbec was contracted to assist in the design and creation of habitat enhancement features on Dry Creek below Warm Springs Dam in Sonoma County.

Moosa Creek Mitigation Bank

Aerial map of watersheds and project areas Existing 100-year flow diagram cbec was recently contracted by Moosa Creek, LLC, who proposes to develop the Moosa Creek Mitigation and Conservation Bank (mitigation bank) to rehabilitate, re-establish, establish, and enhance wetlands, riparian floodplain, and upland buffer along the San Luis Rey River and Moosa Creek. In addition to wetland and stream resources, the mitigation bank is proposed

Feasibility Assessment for Barrier Construction along Sagehen Creek

Lahontan cutthroat trout Sagehen Creek cbec has been contracted by the California Department of Fish & Wildlife to assess the feasibility for fish passage barrier construction at multiple sites along Sagehen Creek, CA. The proposed barriers will prevent non-native fishes from recolonizing Sagehen Creek following the eradication of non-natives and the reintroduction of Lahontan cutthroat trout, a state and federally listed species endemic to the

Urrutia Pond and Bank Restoration Project

cbec was part of the team that prepared the Surface Mining and Reclamation Act (SMARA) plan for the Urrutia Pond and associated river bank in the Lower American River Parkway. cbec was instrumental in providing support for the development and successful grant application for $5 million to the Department of Water Resources’ (DWR) FloodSAFE Environmental Stewardship and Statewide Resources Office (FESSRO) to support design and implementation of the river bank restoration piece of the project. Bank restoration along the Lower American River adjacent to the Urrutia pond involves removal of disused concrete rubble on the riverbank, creation of an inset floodplain terrace, and establishment of riparian upland and shaded riverine aquatic habitat (SRA). The site will be used to provide environmental mitigation for local levee projects in the Sacramento area.

Lower Putah Creek Restoration Project

The Lower Putah Creek Restoration Project would create a new Lower Putah Creek channel through the Yolo Bypass Wildlife Area (YBWA). This channel would connect to and enhance the existing restored tidal channel network on the YBWA and provide a new connection between Lower Putah Creek and the Toe Drain, downstream of the Lisbon Weir. The new channel would provide fish passage and habitat for

College Lake Improvement and Watershed Management Project

Wildlife at College Lake College Lake inundation The focus of this project was to develop a multi-objective management plan for College Lake that enhances opportunities for flood reduction, agricultural water supply, and native species habitat in addition to several other objectives. College Lake is a naturally occurring ephemeral water body located along Salsipuedes Creek, a tributary to the Pajaro River in Santa Cruz County, California.

Cougar Wetlands Habitat Improvement Analysis

Simulated velocity magnitude and direction. The Cougar Wetlands are part of a larger broad-based effort to restore and safeguard the integrity of the Cosumnes River, the last undammed river flowing from the Sierra Nevada to the Central Valley. cbec was contracted by Ducks Unlimited and the US Bureau of Land Management to analyze proposed habitat enhancements. Proposed restoration actions at Cougar Wetlands include the breaching

Santa Ynez River Two-Dimensional Flow Model

Santa Ynez River Simulated velocity for a flow of 6,150 cfs Water surface elevation for a flow of 1,300 cfs cbec was contracted by NMFS to construct a two-dimensional hydrodynamic model. The model is capable of quantifying steelhead migration suitability and habitat availability over a range of discharges for subsequent use by NMFS staff. The results of this study will be used to support the

McKay’s Point Reservoir Sedimentation Rate Study

Bathymetric Surface Comparison (2000 to 2011) Bathymetric Data Collection Using RTK cbec was contracted by NCPA to perform a Sedimentation Rate Study at McKay’s Point Reservoir. cbec performed a bathymetric survey to document existing conditions in October 2011 and developed a set of plan drawings. The existing conditions data was compared to previous bathymetric surveys performed in 1997, 2000, and 2005, and used to characterize

Feather River Levee Setback Project

Backwater on the Feather River. Aerial of Feather River setback floodplain area. Credit TRLIA. Prior to joining cbec, select cbec staff members provided geomorphic and ecosystem enhancement services to the Three Rivers Levee Improvement Authority (TRLIA) on the Feather River Levee Setback Project. Working in collaboration with local, state, and federal interests, this levee setback project designed and constructed a six-mile-long setback levee along the

Grady Ranch EIS/EIR Review

Photos depict large-scale bank erosion and stream degradation Photos depict large-scale bank erosion and stream degradation cbec is providing peer review as part of a revision of an EIS/R associated with a proposed development project at Grady Ranch, part of Skywalker Properties, Marin County, CA. The EIS/R is being undertaken by the Marin County Flood Control & Water Conservation District. cbec staff has performed field

Northern Liberty Island Fisheries Enhancement Project Assessment

cbec applied and refined a 2D hydrodynamic model using MIKE 21FM. The MIKE 21FM model developed by cbec encompasses a complex network of tidal channels (both natural and man-made) within the Yolo Bypass-Liberty Island-Cache Slough Complex. The main goal of the Northern Liberty Island Fisheries Enhancement Project was to assess the feasibility, sustainability, and regional benefits of implementing various proposed enhancements (e.g., levee breaches, ditch plugs, pilot

Central Valley Flood Protection Plan (CVFPP)- Identification and Prioritization of Potential Restoration Sites

Tuolumne River Sacramento River at Rio Vista cbec is currently assisting DWR (through a sub-contract with AECOM) to identify and prioritize potential restoration sites for the CVFPP. The project involves recently developed GIS techniques and the HEC-Ecosystems Function Model (EFM), developed by HEC in Davis, California, applied in support of the Restoration Opportunities Analysis, or ROA. This restoration project includes multi-objective design parameters. GIS techniques:

Lower Yolo Ranch Tidal Restoration Project

Lower Yolo Restoration project overview.Fish rescue operations prior to deepening existing canals.Newly created tidal channels connecting Yolo Ranch to Yolo Flyway Farms (during construction).Newly created tidal channels connected to deepened canals.Toe drain berm breach.Deepening and connecting existing canals.Tide gate removal restoring tidal action to the property. cbec was contracted by Westlands Water District to develop the largest restoration project to date in the Lower Yolo

Water Quality Evaluation of Battle Bend and Other Major Apalachicola River Sloughs

cbec worked with Philip Williams and Associates on a project that aimed to characterize the hydraulic connectivity and water quality of large floodplain sloughs within the Apalachicola River System. This assessment provided data that will compare habitat suitability via water quality and level before and after a restoration project that involves the reconnection / earthen plug removal at Battle Bend for comparisons to other large backwater slough systems within the Apalachicola Floodplain. These critical backwater slough systems have been shown to provide valuable spawning and nursery habitat for at least 50% of all fish within the Apalachicola River System. This dataset will provide a better understanding of ecological function of backwater slough systems within the Apalachicola Floodplain across the range of slough systems. In particular, the evaluation of water quality parameters in Battle Bend and other major sloughs will provide us a better understanding of the importance of water connectivity with the main channel, help to determine the overall success of the current restoration project at Battle Bend, and help to assess the suitability of the approach taken at Battle Bend for use in future restoration activities within the Apalachicola River System.

Lower Squaw Creek Restoration Project

A straightened and over-sized reach of the stream channel, with the ski resort in the background Examples of existing grade control and bank hardening currently in place This project intends to improve fish and wildlife habitat, water quality, and recreational opportunities in Squaw Creek and its adjacent meadow by rehabilitating the natural hydrologic, geomorphic and ecological functions of the system. A variety of historic and

Bangor P990 Crescent Bay Tidal Inlet Monitoring

In 2010, the US Navy undertook a tidal wetland restoration project at Crescent Harbor, Whidbey Island, Puget Sound, Washington. An important element of the restoration project was to breach a previously strengthened barrier beach, carrying a highway. The US Navy constructed a bridge and opened up a lagoon to daily tidal inundation. As a result of the restoration project, tidal flux dramatically created expansion of the tidal inlet.

Sewer Crossing Bank Stabilization and Toe Stabilization Design

As part of the Sacramento Area Sewer District’s Creek Protection Project, cbec teamed with Brown & Caldwell to conduct a geomorphic reconnaissance at 40 stream sewer crossings in Sacramento County. This evaluation was part of a multi-specialty assessment to ascertain the existing stability and integrity of select stream sewer crossings on numerous creeks in the Sacramento region. All work performed was in accordance with the project specifications set forth by the United States Army Corps of Engineers, Sacramento County Department of Water Resources, and the State Water Resources Control Board.

Honolulu Bar Fisheries Enhancement Project

Honolulu Bar is located on United States Army Corps of Engineers (USACE) property and funded by a grant from the U.S. Fish and Wildlife Service – Anadromous Fish Restoration Program. cbec worked as a sub consultant to FishBIO, LLC (project prime) in the design of a fisheries enhancement project for a side channel and mid-channel bar of the Stanislaus River.

Yolo County Drainage and Water Infrastructure Improvement Study

Wallace Weir is located at the terminus of the Knights Landing Ridge Cut and west levee of the Yolo Bypass. Yolo County funded the study of proposals to address potential impacts on agriculture and wetlands by the California Natural Resources Agency and the U.S. Department of the Interior to increase the frequency and duration of inundation in the Yolo Bypass for seasonal fish habitat. Drainage

Hallwood Side Channel and Floodplain Restoration Project

This project is designed to restore and enhance ecosystem processes within an important reach of the Yuba River. The primary project focus is on enhancing productive juvenile salmonid rearing habitat to increase the natural production of fall‐run and spring-run Chinook salmon (Oncorhynchus tshawytscha) and Central Valley steelhead (O. mykiss), by removing unnatural constraints from the river corridor and allowing the project reach to evolve more naturally.

Decker Island Habitat Restoration Project

cbec performed site‐scale hydrodynamic modeling to evaluate restoration design alternatives at Decker Island in support of the DWR Decker Island Habitat Restoration Project.

Black Butte Dam Erosion Repairs

The City of Santa Clara operates a hydroelectric power generating facility at Black Butte Reservoir near Orland, CA. When the facility was constructed, a re-regulation basin was created below the dam spillway. The re-regulation basin elevated the water surface downstream of the spillway, putting it in contact with unprotected banks. During high flow releases from the dam’s “flip-bucket” spillway, a jet of water develops that

Yolo Flyway Farms Tidal Restoration Project

Diagram of project area. Excavation of south berm breach. Excavation of north berm breach. The Yolo Flyway Farms Tidal Restoration Project is located at the southern end of the Yolo Bypass within the Cache Slough Complex. Reynier Fund, LLC undertook this project to promote floodplain access and restore tidal wetlands to enhance and create habitat for special status fish. The primary project objectives were: Enhance

Yolo Bypass Wildlife Area Habitat and Drainage Improvements

The Yolo Bypass Wildlife Area (YBWA) supports agricultural and wildlife habitat management objectives as well as public use. Water delivery and drainage are vital to provide optimal conditions for all objectives.

Swift Slough Restoration Feasibility Study

cbec conducted a feasibility study, on behalf of Florida Fish and Wildlife Conservation Commission, to investigate the dynamics of sediment transport / deposition in the main channel of the Apalachicola River, Swift Slough and the Chipola Cutoff. The hydrologic connectivity of Swift Slough has been reduced by the incision of the main channel generally as a result of decreased sediment supply from the Jim Woodruff Dam and locally by historic navigation and maintenance activities (dredging and spoil disposal) that have been performed by the U.S. Army Corps of Engineers. Since the mouth of Swift Slough is located 1.3 miles downstream of the Chipola Cutoff (a natural area for sediment deposition) and is in the vicinity of significant dredge disposal sites that serve as a local sediment source, the deposition of sediment into the slough during high flow events has further reduced its hydrologic connectivity during low flow periods. Swift Slough has been established as the primary habitat on the Apalachicola River System for several threatened and endangered (T&E) mussel species. Its hydrologic connectivity to the mainstem of the river during low flows periods (< 6,500 cfs) is essential to the long-term viability of these species. The study involved the collection of water surface elevation data, sediment transport data, and bathymetric survey data that was used to develop a 2-dimensional hydrodynamic sediment transport model. This model tested the feasibility of three design alternatives and determined how long each alternative would promote a hydrologic connection to Swift Slough through an improved understanding of sediment dynamics within the project reach. The study results were used in the selection a preferred design alternative that improved the hydrologic connectivity of Swift Slough during low-flow periods in a manner that minimized future maintenance needs, while maintaining the habitat characteristics essential to the viability of T&E mussel species that inhabit Swift Slough.

Oroville Wildlife Area Flood Stage Reduction Project

Feather River bank composition Bank line analysis cbec was sub contracted by PBI to provide a geomorphic assessment of the Feather River in vicinity of the South Unit Oroville Wildlife Area to support the Flood Stage Reduction Project (FSR). The OWA FSR project consisted of weir improvements and ecosystem restoration to increase connectivity of the Feather River to its historic floodplain and reduce stages within

Southport Multi-Objective Flood Control and Habitat Restoration Project

A cornerstone project for cbec, spanning multiple years, and with various project team configurations, this West Sacramento Area Flood Control Agency (WSAFCA) project’s goal is to set back parts of the Sacramento River levee through West Sacramento. This plan will provide 200-year level of flood protection, valuable ecological function, and high recreational value on the restored floodplain.

Lower American River Current Condition DEM and 2D Model Development Project

cbec is developing a current conditions digital elevation model (DEM) and HEC-RAS two-dimensional (2D) hydrodynamic model of the lower American River for the Sacramento Water Forum and the Sacramento Area Flood Control Agency (SAFCA). The DEM and 2D model will help facilitate future habitat restoration projects, flood impact analyses, and levee and bank erosion analyses. To develop the current conditions DEM, cbec contracted Quantum Spatial to fly topobathymetric LiDAR (green and near-infrared sensors) while cbec collected single-beam sonar data in the deep pools. This effort will produce a high-resolution meter-scale DEM that will aid in the 2D modeling effort. In addition, the DEM will enable future work to understand topographic change and sediment budgets within LAR and support habitat restoration planning. cbec is calibrating and validating two hydrodynamic models, an ecological flow model and a flood flow model. The ecological model will apply to flows ranging from 500 to 20,000 cfs. The flood model will apply to flows ranging from 20,000 to 160,000 cfs and will support geomorphic and flood impact analyses. In addition to client involvement, the flood model has been developed with input from MBK Engineers, Northwest Hydraulic Consultants, California Department of Water Resources, US Army Corps of Engineers, and the Lower American River Bank Protection Working Group.

Huckleberry Island Dam Modification

cbec was contracted to investigate the feasibility of modifying or removing the Huckleberry Island Dam to improve passage conditions. Huckleberry Island Dam is located on the San Lorenzo River in Santa Cruz County provides an impediment to fish passage under certain flow conditions. cbec conducted site reconnaissance and field surveys including topographic surveys of the dam site, and photo documentation to help developed design alternatives. Design modifications included partial to complete removal of the dam structure, removal of sediment and modification to retaining wall. A future phase of the project will include preparation of construction documents at a 60% and 100% level of completion.

Bangor P990 Big Beef Estuary Restoration Feasibility, Tidal Hydrodynamic and Sediment Transport Modeling

cbec performed detailed field data collection, and 2-dimensional hydrodynamic and sediment transport modeling of estuarine processes at the Big Beef Creek and Estuary proposed restoration site.

Bangor P990 Shine Tidelands State Park Tidal Lagoon Restoration Feasibility and Tidal Hydrodynamic Modeling

cbec performed detailed field data collection, and developed a 2-dimensional hydrodynamic model of tidal and nearshore processes at the Shine Tidelands State Park proposed restoration site.

Selby Slag EIR

On behalf of the California Department of Toxic Substances Control (DTSC), cbec worked as a subcontractor to Ascent Environmental, Inc., and teamed with AECOM and Stillwater Sciences to inform the impact of contaminated sediment cleanup and shoreline restructuring to local aquatic wildlife.

Bangor P990 Wharf Impacts Modeling

cbec performed detailed 2-dimensional hydrodynamic and sediment transport modeling of tidal flux and currents in the Hood Canal, a sub-basin within the Puget Sound inlet system, Washington.

Dry Creek Greenway Trail Fluvial Audit

cbec was contracted to assess the potential risk and prioritize mitigative measures for the City of Roseville muti-use trail along approximately 4.5 miles of Dry, Cirby and Linda Creeks between Darling Way and Spahn Ranch Road. cbec used a processed-based geomorphic assessment including desk-based analysis of historical aerials, LiDAR data and specific stream power coupled with a field-based fluvial audit. The fluvial audit is a ‘fit-for-purpose’ methodology that characterizes indicators of physical processes and anthropogenic controls and impacts on channel behavior. This approach was used to inventory features such as channel reach type (e.g., pool-riffle, plane bed), sediment sources (e.g., bank erosion, tributary inputs), and in-channel sediment storage. We also assessed river engineering measures (e.g., channel straightening, bank protection, grade control structures, levees, etc.) to facilitate a more nuanced understanding of human impacts to physical processes and the resulting influences on dynamic channel behavior. The survey was conducted on foot and utilized a field tablet computer equipped with GIS mapping software to record observations, photos and locations using GPS. The resulting field data and desk-based findings were used to characterize the channel’s geomorphic regime and to develop a trail alignment risk assessment methodology with five risk classifications. An initial evaluation of risk was made on the basis of primary criteria (bank erosion and proximity of trail to the edge of the channel) which was then corroborated or modified through consideration of secondary criteria. Six trail locations with extreme or high risk were identified as well as 48 segments with moderate risk (a number which includes trail segments adjacent to higher risk areas as well as clusters of multiple areas exposed to moderate risk). To address the extreme or high levels of risk to the trail at these six sites, concept-level mitigative measures were developed and prioritized.

Bear River Levee Setback Project

Prior to joining cbec, select cbec staff members provided geomorphic and ecosystem enhancement services to the Three Rivers Levee Improvement Authority (TRLIA) on the Bear River Levee Setback Project.

Lower Yuba River Long Bar Restoration Project

cbec is working as part of a team on this floodplain restoration project aiming to create rearing habitat for salmonids on a roughly 50-acre riverside gravel mine property at Long Bar on the Yuba River.

Crane/Domeyer/Willow Bar Restoration Project

The Crane, Domeyer, and Willow Bar sites are all part of the Sauvie Island Wildlife Area (Oregon Department of Fish & Wildlife). They are managed for fish and wildlife habitat as well as recreation and hunting opportunities.

Flights End Restoration Concept Modeling and Alternative Analysis

The Flights End site is within the ODFW managed Sauvie Island Wildlife Area, a floodplain refuge habitat just downstream of the urban waterfront corridors on the Columbia and Willamette Rivers.

Shire Fish Passage Enhancement Modeling

The Shire project site is located in the Columbia River Gorge in Washington State. The site offers an opportunity to enhance the tidal hydrological connection to a high quality forested wetland complex.

Little Egbert Tract Feasibility Study and Multi-Benefit Project

Under contract with SAFCA, the study team (Wood Rogers, cbec, MBK, ICF, and David Sill) in collaboration with the steering committee (SAFCA, Larsen Wurzel & Associates, Westervelt Ecological Services, DWR DES, DWR DFM, and Solano County) developed a feasibility study for the restoration of Little Egbert Tract.

Natomas East Main Drainage Canal Monitoring Project

cbec has been undertaking a variety of different monitoring activities on Natomas East Main Drainage Canal (NEMDC), otherwise known as Steelhead Creek, since 2015. Monitoring activities include unmanned aerial system (UAS) based photography, ADCP velocity/ flow measurement, bathymetric surveying using remote controlled boat based sonar, water level/stage monitoring, dissolved oxygen concentration, and temperature. The purpose of the monitoring is for several reasons, including vegetation and flood stage monitoring, flow gauging, and water quality monitoring (DO and temperature). Steelhead Creek is an important flood control channel that drains the east side foothill tributaries that flow towards Natomas, as well as a pathway for anadromous fish passing upstream to spawn in the east side tributaries, and juveniles passing down into the Lower American River. This project is part of a larger project to reduce flood risk and to provide ecological enhancement to the North Sacramento Streams group.

Wallace Weir Improvement and Fish Exclusion Project

Part of the California Natural Resources Agency’s California EcoRestore initiative, this fish exclusion project aimed to improve the operations of Wallace Weir, as well as implement a fish trapping facility to prevent adult salmon entry into the Colusa Basin Drain.

Flood Impact Analysis for the Saluda Hydroelectric Project

The Federal Energy Regulatory Commission (FERC) requested Dominion Energy to quantify potential effects of a proposed change in reservoir operational procedures on flood levels upstream and downstream from the Saluda Hydroelectric Project located on the Saluda River at Columbia, South Carolina. FERC’s request was addressed by acquiring the necessary data, conducting flow-frequency analyses, and selecting six of the most extreme reservoir inflow events from the historical record for model simulations with a focus on comparing effects between existing (EX) and proposed (PR) reservoir operations.

Metz Lateral Channel Rehabilitation

Located in Posey County, Indiana, the purpose of this project was to stabilize ongoing erosion problems in the lower 750 feet of the Metz Lateral Drain upstream from its confluence with Big Creek. Bank and channel stabilization techniques were implemented to provide a long‐term solution to limit future bank erosion and channel degradation within the reach. The downstream 750 feet of the Metz Lateral Drain near the confluence with Big Creek had deeply incised to a depth of over 10 feet and widened with a top width of up to 50 feet. The incision and subsequent widening of the channel has led to an over‐steepened bank profile allowing for bank instability and erosion. The bank erosion has contributed to a loss of the adjacent agricultural land and likely impacted downstream water quality through the transport of sediment and nutrients. The techniques implemented within this project included vertical grade control, resloping of the channel banks, and bioengineering/stabilization with vegetation. This stream channel stabilization project, in combination with the two-stage ditch project immediately upstream, has significantly improved the overall integrity of the lower Metz Lateral Drain and the greater Big Creek Watershed in Posey County, Indiana.

Wetland Design in the Patoka Valley

cbec prepared final designs for wetland creation and enhancement on two 40-acre parcels of land in Pike County owned by Patoka Valley Conservation Partners (PVCP). This project was ultimately enrolled in the USDA Natural Resources Conservation Service (NRCS) Farm Service Agency’s (FSA) Conservation Reserve Program (CRP). It serves as one of the largest of such projects in the region. This wetland project is located adjacent to the Patoka National Wildlife Refuge, which allowed for a unique opportunity to enhance the overall ecosystem within the greater wildlife area. cbec played a central role in the development of final designs for this project, including facilitating coordination between the landowner and the local NRCS staff, watershed scale geomorphic reconnaissance, project site survey, hydrologic calculations, wetland design as well as construction oversight / inspection.

Kings Bay Flow Modeling and Sedimentation Study

cbec worked as a subcontractor to Versar, Inc, on behalf of AECOM and Naval Facilities Engineering Command (NAVFAC) – Atlantic. cbec built a hydrodynamic and sediment transport model of the estuary and coastal zone near Kings Bay, GA. As a critical transportation corridor in the region, an immense amount of money and effort is invested to maintain navigable channels within and beyond the Cumberland Sound near Kings Bay. To better understand hydraulics in the system, sources of sediment, erosion/deposition around key infrastructure, potential dredging alternatives, and infrastructure improvements, cbec was hired to build, validate, and calibrate a large scale, 3D, hydrodynamic computer model with sediment transport capabilities. The 3D model was built using the Danish Hydraulic Institute’s (DHI) MIKE3 modeling platform. The model covered +500 square miles with emphasis placed on the navigation channel and coastal littoral zones. Due to the complex nature of the system and spatial distribution of deposition, both cohesive and non-cohesive sediment types were modeled to more accurately predict impacts. Additionally, since the navigation channel spans both estuary and offshore environments, pure current and littoral processes were simulated. Using the calibrated and validated model, cbec effectively provided feedback and guidance to inform dredging actions and initial planning for larger infrastructure projects.

Butano Creek Channel Reconnection and Resilience Project

This multi-objective project addresses critical fish passage, water quality and flood risk challenges affecting Butano Creek, Pescadero Marsh and Lagoon and the surrounding community of Pescadero in unincorporated San Mateo County. Anthropogenic disturbances to the watershed have significantly increased sediment delivery to Butano Creek and the Pescadero Marsh.

Lower American River Salmonid Habitat Enhancement Program

This ongoing salmonid gravel augmentation and side-channel habitat establishment program effort is made possible by continued collaboration with the Water Forum, US Bureau of Reclamation, and the US Fish & Wildlife Service.