Master Planning and Modeling

Project

Storm Drainage Master Plan, GPS Surveys and GIS Mapping
Vallejo Sanitation & Flood Control District, California

West Yost developed a Storm Drain Master Plan for VSFCD with a focus on the evaluation, alternatives, and cost estimates for addressing existing flooding problems. To assist in the master planning process, West Yost  developed computer models of five watersheds within the District using the MOUSE hydrologic/hydraulic model package, and conducted GPS and Total Station field surveys of over 6,000 storm drain facilities. West Yost also evaluated the feasibility of redirecting the highly polluted first flush flows and dry weather flows from the District’s storm drain system into the District’s sanitary sewer system for treatment at the wastewater treatment plant, and assisted the District in public outreach for the master plan. 

Project

Citywide Storm Drain Master Plan
City of Vacaville, California

West Yost prepared a comprehensive storm drainage master plan and $16 million Capital Improvement Program for the City. Services included hydrologic and hydraulic analysis of major stream systems using the HEC-1 and HEC-2 computer models, and piping systems using the Storm computer model. Major on-line and off-line detention basin facilities were modeled and sized for integration into the overall stormwater plan. A financing and connection fee study was also completed.

Project

Live Oak Master Drainage Study
City of Live Oak / Reclamation District 777, California

West Yost jointly prepared a Master Drainage Study (MDS) for the City and the District. The goal for preparing a joint document was to ensure that the two agencies did not develop conflicting drainage plans. The purpose of the study was to allow the City to grow without causing upstream or downstream impacts to the agricultural areas or causing increased flooding within the City. West Yost developed design criteria for the City, developed an XP-SWMM hydraulic model, evaluated the adequacy of existing City drainage infrastructure and the District channel system, and analyzed four alternative drainage plans for buildout associated with the City’s new General Plan.

Project

Drainage Master Planning & Design Review for North Natomas
City of Sacramento, California

West Yost prepared design standards for drainage pump station design and provided on-call consulting services to the City for drainage master planning of the North Natomas development area. The design standards were used by various design engineers for the design of seven pump stations, numerous detention/water quality basins, and conveyance systems servicing the 5,000-acre development area.

Project

Dynamic 2-D Modeling
Various Clients

West Yost routinely conducts accurate hydrologic/hydraulic evaluations. This includes using dynamic 2-dimensional (2-D) surface flow modeling to more accurately predict results and to graphically demonstrate solutions. Recent projects include the Alamo Creek 2-D Flood Study for the City of Vacaville, and 2-D modeling for a 4,000 acre alluvial fan flooding analysis in the Mojave Desert for the Ivanpah Solar Facility project.

Project

Citywide Storm Drainage Master Plan
City of Elk Grove, California

West Yost assisted the City by preparing a comprehensive storm drainage master plan (SDMP) to address population growth and protect residents from flooding. 

Project

Redevelopment Area Drainage Master Plan
City of Folsom

West Yost prepared a comprehensive drainage master plan for the City’s historical downtown/redevelopment area that encompassed 970 acres in two major watersheds. The master planning effort included determining the capacity of existing drainage facilities, identifying existing deficiencies, evaluating impacts of future growth, determining required facilities to meet future needs and improve existing deficiencies, and determining maintenance needs.

Project

Storm Drain Master Plan
Town of Loomis

West Yost prepared a drainage master plan for the Town with three main objectives: evaluating existing flooding problems, identifying potential improvements, and preparing drainage utility maps. The Town did not have storm drain utility maps, therefore, significant effort was devoted to developing these maps. This project also included incorporating the 100-year floodplain into the utility mapping, developing flood control facilities, preparing facility cost estimates, and developing a storm drain maintenance program.

Project

Ivanpah Solar Electric Generating Facility Stormwater Runoff and Sediment Transport Analysis
BrightSource Energy, Inc., California

West Yost prepared a 2-dimensional storm drainage model for a proposed 400 MW solar power project covering 4,000 acres in the Ivanpah Valley in the Mojave Desert in California. The project is situated on an alluvial fan located at the base of the Clark Mountain Range. Flood flows from the mountains are initially confined in incised channels, but once arriving on the alluvial fan, the flood flows are less confined and can take random paths across the fan.

Project

Central Rocklin Drainage Master Plan
City of Rocklin

West Yost prepared the Downtown Drainage Master Plan for the City. The Downtown Drainage Master Plan quantified the present runoff from the study area to the creeks; identified drainage problems; determined the capacity of existing drainage facilities; and developed drainage policies and design criteria for the master plan.

Project

Storm Drain Master Plan
City of Napa

West Yost developed the first storm drain master plan for the City. The master plan included: the development of updated planning and design criteria for the development standards, preparation of hydrologic and hydraulic evaluations of existing drain facilities, evaluations of documented problem areas, preparation of cost estimates, development of recommended capital improvements, completion of a financial plan and preparation of the initial environmental study on the master plan recommendations.

Project

Ulatis System Drainage Study
Solano County Water Agency, California

West Yost updated the flood control master plan for the Ulatis Creek Watershed. The objectives were to determine the City of Vacaville’s (City’s) existing level of flood protection along the major creeks draining through the City, evaluate flood control alternatives to increase the City’s level of flood protection, and identify preferred projects for implementation within each watershed.

Project

Storm Drain Master Plan, Infrastructure Planning and Design
City of Dixon, California

West Yost performed a master drainage study for the City with complete review and analysis of applicable hydrologic models and development of a recommended Capital Improvement Program. West Yost also provided planning and design services for storm drainage infrastructure including detention ponds and pumping stations.

Project

Storm Drain Master Plan and Facility Designs
City of Manteca

West Yost prepared a Storm Drain Master Plan for the City and developed a $17.6 million Capital Improvement Program. West Yost also led a stormwater management utility fee study to identify the financial needs and revenues to operate and maintain the storm drain facilities, including the newly-identified stormwater quality improvement program according to the City’s NPDES Phase II permit.

Project

Storm Drain Master Plan
University of California, Davis

The University of California, Davis campus is the largest campus in the UC system, spanning over 5,500 acres across two counties (Yolo and Solano). West Yost prepared a campus-wide storm drainage master plan, that included a detailed capital improvement program to meet existing and planned growth.

Project

On-Call Modeling & Setterquist Park Design
Vallejo Sanitation & Flood Control District

After preparing the VSFCD Flood Control Master Plan, West Yost provided on-call modeling and design services on serveral projects for the District. This included preparing the design of a headwall, trash rack, and access road for an open channel within Setterquist Park, reviewing a Caltrans plan to enlarge three culverts under I-80, and developing a low-cost storm drainage improvement plan to address increased flows through the Caltrans culverts.

Project

EIR and General Plan Support
Various Clients, California

West Yost routinely provides support of Environmental Impact Report (EIR) and General Plan efforts for communities throughout California, specifically in the area of flood control and storm drainage.

Commands