Flood Control/Stormwater Services
Planning Services
- Drainage system masterplanning for large and small communities and new development projects
- Drainage system modeling using XPStorm, XP-SWMMM and EPA-SWMMM
- Open channel hydraulic modeling using HEC-RAS, HEC-2, UNET, and Culvert HY-8
- Hydrologic Modeling using HEC-HMS and HEC-1
- Bridge and culvert hydrologic and hydraulic analysis (H&H), including CalTrans Location Hydraulic Studies
- Bridge and culvert scour analysis
- Infrastructure rehabilitation plans
- GIS database preparation and updating
Studies
- Dam inundation studies using 2D software meeting DSOD 2017 requirements
- Conditional Letter of Map Revision (CLOMR) Application preparation
- Letter of Map Revision (LOMR) Application preparation
- Dam Break Analysis
- Feasibility studies
Drainage and Flood Control Infrastructure Design Services
- Drainage gravity and pressure pipeline design
- Drainage inlet design
- Rehabilitation of existing systems
- Storm Drain Pump Station Design
- Flood Control Storage reservoirs
- Weir overflow design
- Levee design
Permitting Services
- Central Valley Flood Protection Board (CVFPB)
- CEQA/NEPA Environmental documentation
- Exemption documentation
- Encroachment permit documentation
- Storm Water Pollution Prevention Plan (SWPPP)
- Erosion and sediment control plan development
- Caltrans permitting
Additional Services
- Grant writing and administration
- United States Department of Agriculture (USDA) Rural Development grant application preparation and administration
- Environmental Protection Agency (EPA) grant application preparation and administration
Flood Control/Stormwater Projects
Emergency Retention Basin (ERB), Harvey Place and Indian Creek Inundation Studies and EAPs – South Tahoe Public Utility District
Emergency Retention Basin (ERB), Harvey Place and Indian Creek Inundation Studies and EAPs – South Tahoe Public Utility District
Emergency Retention Basin (ERB), Harvey Place and Indian Creek Inundation Studies and EAPs – South Tahoe Public Utility District
Completed the Inundation map and studies for three dams. The ERB dam which is a “high hazard” dam with failure flows terminating in Lake Tahoe was approved by DSOD in the spring of 2020. The EAP was submitted later in the summer and has been reviewed by OES. The much larger Harvey Place and Indian Creek dams have recently been approved by
Completed the Inundation map and studies for three dams. The ERB dam which is a “high hazard” dam with failure flows terminating in Lake Tahoe was approved by DSOD in the spring of 2020. The EAP was submitted later in the summer and has been reviewed by OES. The much larger Harvey Place and Indian Creek dams have recently been approved by DSOD. These dams are located in Alpine County and inundate communities several miles away in (Minden area) Nevada.
Arden Service Area Improvements Implementation Plan – Sacramento County Water Agency
Emergency Retention Basin (ERB), Harvey Place and Indian Creek Inundation Studies and EAPs – South Tahoe Public Utility District
Emergency Retention Basin (ERB), Harvey Place and Indian Creek Inundation Studies and EAPs – South Tahoe Public Utility District
The project involved updating an existing system hydraulic model with existing system improvements and changes to well operation. The model was calibrated to existing conditions using a series of fire flow tests. Once calibrated, the model was used to determine areas of undersized piping not meeting fire suppression requirements. Proposed
The project involved updating an existing system hydraulic model with existing system improvements and changes to well operation. The model was calibrated to existing conditions using a series of fire flow tests. Once calibrated, the model was used to determine areas of undersized piping not meeting fire suppression requirements. Proposed pipelines were sized using the model. The model includes 12 wells and over 38 miles of pipelines. An implementation plan was developed for the area which outlines the design and permitting requirements for the overall pipeline and meter installation improvements.
Bridge Hydraulic Analysis and Scour Mitigation Projects San Joaquin County, CA
Emergency Retention Basin (ERB), Harvey Place and Indian Creek Inundation Studies and EAPs – South Tahoe Public Utility District
Bridge Hydraulic Analysis and Scour Mitigation Projects San Joaquin County, CA
Performed hydrologic and hydraulic and scour analyses for eight bridge replacement projects in San Joaquin County and currently under contract for seven more. Analyses include changes in water surface elevations and velocities using HEC-RAS, tidal hydraulic effects and scour depth calculations. Design for scour countermeasures were provided.
Flood Control for a Large Scale Development Stockton, CA
Fairchild Village Drainage System Improvement Project El Dorado Hills, CA
Bridge Hydraulic Analysis and Scour Mitigation Projects San Joaquin County, CA
D&A provided detailed watershed hydrology for a 430 square mile watershed including two reservoirs and five tributary streams. Stream hydraulics and floodplain mapping were provided for approximately 6000 feet of channel through an approximately 1500 acre development. D&A provided levee, pump station, and regional detention basin desig
D&A provided detailed watershed hydrology for a 430 square mile watershed including two reservoirs and five tributary streams. Stream hydraulics and floodplain mapping were provided for approximately 6000 feet of channel through an approximately 1500 acre development. D&A provided levee, pump station, and regional detention basin design along with coordination and negotiations with Army Corp of Engineers, San Joaquin County, Central Valley Flood Control Board, and City of Stockton regarding flood control improvements. This project also included three highway bridge crossings and two railroad bridge crossings. Three regional detention basins equaling 1600 acre-feet of storage were included in the project design.
Yountville Masterplan and Floodwall Yountville, CA
Fairchild Village Drainage System Improvement Project El Dorado Hills, CA
Fairchild Village Drainage System Improvement Project El Dorado Hills, CA
Provided final design of interior drainage facilities and construction management for approximately one mile of floodwall for the community of Yountville. The wall height ranges from two feet to nine feet. A new pump station and detention basin was part of the interior drainage system. Additionally, D&A provided HEC-RAS modeling of the
Provided final design of interior drainage facilities and construction management for approximately one mile of floodwall for the community of Yountville. The wall height ranges from two feet to nine feet. A new pump station and detention basin was part of the interior drainage system. Additionally, D&A provided HEC-RAS modeling of the Napa River and two main tributaries through the town of Yountville. Follow-up services included a CLOMR and LOMR to remap the floodplain limits for the town and preliminary design for channel improvements, detention facilities, and new drainage pipelines within the town limits.
Fairchild Village Drainage System Improvement Project El Dorado Hills, CA
Fairchild Village Drainage System Improvement Project El Dorado Hills, CA
Fairchild Village Drainage System Improvement Project El Dorado Hills, CA
D&A provided hydrology and hydraulic analysis for outfall facilities through a large housing development in the community of El Dorado Hills. Following significant flooding events, after identification of deficient facilities, D&A provided channel inlet structure and pipeline facility designs to remedy the flooding problems.