"D&A is committed to providing personal client service with innovative value"

Services: Flood Control/Stormwater Engineering

D&A has wide-ranging experience in flood control and stormwater studies and design.  Our projects range from  drainage masterplanning for communities to hydrology and hydraulic studies for bridge/roadway expansions to FEMA studies for large scale developments to design of stormwater improvements.  The information below provides and overview of the services we provide.  For more information and a list of references please contact us at 916-933-1997. Additional contact information can be found on our contacts page.

Planning Services include:

  • Drainage system masterplanning for large and small communities and new development projects
  • Drainage system modeling using XP-SWMMM and EPA-SWMMM
  • Open channel hydraulic modeling using HEC-RAS, HEC-2, UNET, River 2D 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
  • Dam Break Analysis
  • Feasibility studies
  • Infrastructure rehabilitation plans
  • GIS database preparation and updating


  • 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

Drainage and Flood Control Infrastructure Design Services include:

  • 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 include:

  • Central Valley Flood Protection Board (CVFPB)
  • CEQA/NEPA Environmental documentation
  • Exemption documentation (if applicable)
  • Encroachment permit documentation
  • Storm Water Pollution Prevention Plan (SWPPP) development and monitoring (using SMARTS)
  • Erosion and sediment control plan development
  • CalTrans permitting

Construction Services include:

  • Engineering services during construction
  • Submittal/RFI review
  • Change order review
  • Specialty inspection and testing services
  • Full Construction Management

Additional services include:

  • Grant writing and administration