Stormwater Projects

Overview

Stormwater
Service Overview

West Yost provides a complete range of stormwater engineering services on projects ranging from drainage studies for small individual sites through regional solutions for large watersheds. Our stormwater planning and design engineers have a strong history of delivering projects that demonstrate value through innovative thinking, and significantly reduced capital costs of solutions and alternatives. Our expertise includes technical depth in storm drainage master planning, facility design; preparation of environmental impact reports addressing storm drainage, water quality, wetlands, water rights, and soil erosion; and hydrologic and hydraulic drainage system modeling.

Our stormwater expertise includes the following:

  • Master Planning
  • Storage and Conveyance Facilities Planning and Design
  • Permitting and Regulatory Compliance
  • Stormwater Quality Management
  • Hydraulic Modeling for Stormwater Systems
  • Hydrologic Modeling and Floodplain Mapping
  • Habitat Restoration
  • Engineering Support for Environmental Impact Analyses
  • Funding Strategies
  • Infrastructure Rehabilitation
  • GIS/Mapping and Surveying
  • Program Management
  • Construction Management
Overview

Stormwater

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

Dry Creek Levee Relocation
City of Roseville, California

West Yost provided planning, analysis, environmental review, permitting, design, and construction management services for the Dry Creek Wastewater Treatment Plant Pond Levee Relocation. This project included the hydrologic and hydraulic evaluations of setting the pond levees 100 feet back from the Dry Creek bank in order to provide 100-year protection of the wastewater storage ponds while enhancing the flow-carrying capacity of Dry Creek in an environmentally sensitive manner.

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

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

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

Sterling Chateau #5 FEMA LOMR Application
City of Vacaville

Using Flo-2D modeling software, West Yost developed a 2-dimensional hydraulic model to route Alamo Creek overflows through a residential neighborhoods for several miles and back into Alamo Creek. Staff also prepared a FEMA LOMR application for a portion of the floodplain. 

Project

Willey Restoration Project
Sacramento County, California

West Yost under contract to an environmental services firm, provided engineering design and construction period  services for converting 217 acres of rice farmland into a wetlands and endangered giant garter snake habitat. The wetland will rely on two water sources: agricultural delivery and an onsite supplemental groundwater well.

Project

Soscol Gateway Interior Drainage Improvement
City of Napa, California

West Yost reviewed previously prepared technical studies and schematic-level designs of two design alternatives to handle overland drainage in the Soscol Gateway area of Napa. Following this review, West Yost developed an alternative drainage plan that had an estimated cost of about $6.4 million, nearly a 50% cost savings from the previously developed project (at about $12 million). In addition, the performance of this alternative, low cost approach was verified as better than the performance of the previous plan.

Project

Newcastle Road and North Little Johns Creek Stormwater Pump Station
Stockton, California

West Yost designed a stormwater pump station serving the Opus Logistics Center in east Stockton. The project consists of the construction of a below grade stormwater pump station with a rated capacity of 44 cfs.

Overview

Construction Management
Stormwater

Project

Construction Management for Valley Glen Stormwater Pump Station
City of Dixon, California

West Yost provided construction management/inspection under an accelerated construction schedule for this 156 cfs stormwater pump station, which included trench style concrete wetwell, mechanical “flexrake” trash rack, four propeller duty pumps with low speed motors, and one low flow pump. Construction was completed 10 weeks after breaking ground to provided the interim stormwater pumping facilities needed to accept stormwater.

Project

Dry Creek Levee Relocation
City of Roseville, California

West Yost provided planning, analysis, environmental review, permitting, design, and construction management services for the Dry Creek Wastewater Treatment Plant Pond Levee Relocation. This project included the hydrologic and hydraulic evaluations of setting the pond levees 100 feet back from the Dry Creek bank in order to provide 100-year protection of the wastewater storage ponds while enhancing the flow-carrying capacity of Dry Creek in an environmentally sensitive manner.

Project

Stormwater Engineering Services in Support of Transportation Projects
Various Clients

West Yost staff members routinely provide stormwater engineering services in support of transportation projects. These services include: hydrologic and hydraulic analyses to define drainage and stormwater quality treatment facilities; design of pump stations to evacuate storm runoff; and hydraulic and scour potential for bridges and overcrossings.

Commands