• San Dieguito River Restoration; Del Mar, California
  

Southern California Edison
Prepared two-dimensional hydraulic modeling of the San Dieguito River using FESWMS. A finite-element grid was developed based on topographic mapping of the 100-year floodplain. A FESWMS analysis was then performed to determine the ineffective flow areas and a 2-D representation of the flow velocities, flow patterns, and water surface elevations.

• Pala Borrow Site; San Diego, California
  

H.G. Fenton Company
Prepared hydraulic and sedimentation analyses of an in-stream sand mining pit on the San Luis Rey River. HEC-2 analyses were performed for both the 100-year and probable maximum precipitation storm events. The HEC-2 analyses were also used to design a riprap-lined dike to protect the pit from the active river flow. The FLUVIAL-12 analyses were performed to ensure that the dike design would minimize negative impacts from aggradation and degradation in the adjacent river reaches. In particular, the project was required to minimize channel bed degradation over a downstream aqueduct crossing and encourage channel bed aggradation within an upstream property. The project was processed through the County of San Diego for a Major Use Permit, and the US Army Corps of Engineers and US Fish & Wildlife Service for a Clean Water Act Section 404 Permit.

• Birch Restoration Plan; San Diego, California
  

Future Mountain Development Trust
Prepared sedimentation analyses to develop a physical restoration plan for an in-stream sand mining pit on the San Luis Rey River. The FLUVIAL-12 analyses were used to determine the historic and post-mining sedimentation impacts within the 100-year floodplain. In addition, a restoration plan was developed to allow the site to naturally restore to historic conditions. The restoration plan was processed through the US Environmental Protection Agency.

• La Costa Golf Course Bridges; La Costa, California
  

La Costa Resort and Spa
Prepared hydraulic and sedimentation analyses to design four bridge crossings within the La Costa Golf Course. A HEC-2 analysis was performed to design bridges that would minimize impacts on the existing 100-year water surface elevations and a FLUVIAL-12 analysis was used to predict the general and contraction scour at the bridges. The local scour calculations were performed to determine the abutment scour at the bridges.

• Bonita Road Bridge; San Diego, California
  

County of San Diego
Prepared hydraulic analyses to design a replacement bridge for the Bonita Road crossing of the Sweetwater River. The HEC-2 analyses were performed to establish the bridge span, bridge height, and pier spacing. The bridge design was required to prevent adverse floodplain impacts on adjacent properties during a 100-year storm event. The abutment and pier scour calculations were performed to design protection for the bridge abutments and to determine the pier embedment depths. The bridge design was processed through both the County of San Diego and Caltrans. Consequently, all of the analyses were performed in English and metric units.

• Loma Alta Creek; Oceanside, California
  

City of Oceanside
Prepared hydrologic and hydraulic analyses of Loma Alta Creek within the city of Oceanside. The HEC-1 analyses were used to determine the 10-, 50-, 100-, and 500-year flow rates within the creek, and to design six in-stream detention basins. The HEC-2 analyses were used to design a flood control channel, a bridge crossing, and a culvert crossing. These improvements minimized the 100-year inundation in an existing mobile home park and commercial areas. A Conditional Letter of Map Revision (CLOMR) was prepared for the revised floodplain and floodway. The project was coordinated with the North County Transit District, San Diego Gas & Electric, the California Department of Fish and Game, the US Fish & Wildlife Service, and the US Army Corps of Engineers.

• Rancho Carlsbad Mobile Home Park; Carlsbad, California
  

City of Carlsbad
Prepared hydrologic and hydraulic analyses to design drainage improvements to minimize the 100-year inundation within the existing mobile home park. The Aqua Hedionda and Calavera Creek are located within the mobile home park, and do not have capacity for the 100-year storm event. Four detention basins were designed for the project, which included two flow-through and two flow-by basins. In addition, channel improvements were designed for both creeks. Additionally, a Conditional Letter of Map Revision (CLOMR) was processed through the City of Carlsbad and the Federal Emergency Management Agency.

• Vista Master Drainage Plan and Map Revisions; Vista, California
  

City of Vista
Prepared hydrologic and hydraulic analyses of three major watercourses, Agua Hedionda Creek, Buena Creek, and Buena Vista Creek, within the city of Vista. The analyses were used to delineate the 100-year floodplain and floodway throughout each creek. This required modeling of all the existing bridges, culverts, drop structures, and channel improvements in each creek. In addition, the analyses were used to design a proposed detention basin and channel improvements in Buena Vista Creek. Both Conditional Letter of Map Revisions (CLOMR) and Letter of Map Revisions (LOMR) were prepared and processed through the City of Vista and the Federal Emergency Management Agency based on the analyses. Also involved in preparing a Master Drainage Plan for the entire city, the Master Drainage Plan identified the major drainage systems throughout the city, 100-year flow rates, system deficiencies, and system upgrade/replacement costs. In addition, a Geographic Information System (GIS), based on ArcInfo and ArcView, was developed for the Master Drainage Plan.

• Ocean Beach and Sunset Cliffs Master Drainage Plans; San Diego, California
  

City of San Diego
Prepared Master Drainage Plans for the Ocean Beach and Sunset Cliffs communities using a Geographic Information System (GIS). An AutoCAD drawing was created containing base information such as the drainage basin boundaries, flow paths, routing information, node numbers, and node elevations. The GIS “polygon processing” using ArcInfo was performed on the AutoCAD file, a digital soil coverage file, and a digital land use file to automate basin area, flow length, and runoff coefficient calculations. The polygon processing was much more efficient and accurate than traditional methods of determining these variables. Using a GIS, the final Master Drainage Plan could be queried using ArcView. In addition, a cost-benefit analysis for the required drainage improvements was prepared and several presentations to the Ocean Beach Town Council were given.

• Rancho Carrillo; Carlsbad, California
  

Continental Homes
Prepared hydrologic, hydraulic, and sedimentation analyses for this 1,200-lot residential subdivision. The HEC-1 analyses were performed to design three large flow-through detention basins. One basin was classified as a dam by the Division of Safety of Dams (DSOD) and had to be designed for the 25,000-year storm event. The remaining two basins had to be processed through DSOD to obtain certification that they were not classified as dams. The HEC-2 analyses were performed to delineate the 100-year floodplain and to design bank protection and drop structures within Carrillo Creek, which bisected the site. A FLUVIAL-12 analysis was performed to design scour protection for a pedestrian bridge crossing of Carrillo Creek. In addition, a Notice of Intent and several Storm Water Pollution Prevention Plans were prepared for the development.

• 4S Ranch Neighborhood 2, Unit 1; San Diego, California
  

4S Ranch Kelwood General Partnership
Prepared hydrologic and hydraulic analyses to design storm drain improvements for this 230-lot residential subdivision, which included curb inlet and pipe sizing. He also designed two bio-retention basins that were used to treat the initial site runoff, which were sized according to the San Diego Municipal Storm Water Permit’s numeric sizing criteria. Two junction structures were designed that directed the initial runoff to the bio-retention basins, while allowing larger flows to continue within the storm drain system. In addition, a Notice of Intent and Storm Water Pollution Prevention Plan were prepared for the development.

• Buie Murrieta; Murrieta, California
  

Buie Communities
Prepared hydrologic and hydraulic analyses for this residential subdivision. The Riverside County Flood Control and Water Conservation District’s synthetic hydrograph procedures were used to design three water quality basins and HEC-RAS was used to design a wetlands area with three gabion check dams. He coordinated closely with the Regional Water Quality Control Board to obtain a Clean Water Act Section 401 Permit for the project.

Professional Experience

Managing Consultant

Hromadka & Associates, Costa Mesa, California, October 2003-Present