Drainage Facility Design Big Sky Ranch, City of Simi Valley, California—Project Manager for the preparation of the Tentative Map drainage studies for the Big Sky Development. Work primarily included preparation of a master hydrology study including storm drain layout, debris basin design, and bulked-flow analysis utilizing Scott’s Method for estimating watershed debris potential. Work also included first flush water quality basin sizing utilizing Ventura County methodology, and detention basin analyses and design.
A channel protection feasibility analysis was also prepared to identify potential scour countermeasures for the project. HEC-RAS was used in the concept analysis and the design of scour countermeasures. Sediment continuity and equilibrium slope analysis were also prepared to assess scour potential. The project also required close coordination with the regulatory agencies, the City of Simi, and Ventura County.
Plum Canyon Development, City of Santa Clarita, California—Project Manager for the final design of the drainage improvements associated with the Plum Canyon development project. The hydrologic analyses and designs were prepared per Los Angeles County Flood Control drainage criteria. Work primarily included processing of hydrologic and hydraulic reports, and the processing of a CLOMR/LOMR package through LACFC and FEMA.
Additionally, a channel protection feasibility analysis and design was also performed for the project. Moreover, a channel protection inline baffle impact basin design was also prepared to mitigate for potential downstream scour impacts, due to high flow velocities within the improved upstream channel. The project also required close coordination with the regulatory agencies, LACFC, and DPW.
Spring Mountain Ranch, Riverside County, California—Project Manager for the final design of the drainage improvements associated with the 1,500 unit Spring Mountain Ranch development project. The hydrologic analyses and drainage system designs were prepared, per Riverside County Flood Control and Water Conservation District drainage criteria. Project debris basin sediment volumes were developed using the document entitled, “Army Corp of Engineers-LA District Method for the Prediction of Debris Yield-updated February 2000.”
The project also included the design of an environmental mitigation channel, which was used to provide flood protection for this development and Pigeon Pass Road, i.e., a major arterial associated with the project. Design features included 7-8 drops structures that allowed for the construction of flat channel bed slopes, relative to the existing channel profile. This design approach was used to mitigate scour potential within the channel by reducing scouring velocities. Moreover, a scour countermeasure feasibility study was also prepared to address the type(s) of measures that would be most appropriate for the project from both an engineering and cost perspective. The HEC-RAS was used in the design of these improvements as well as in the design of two long-span culverts. Bulked flow analyses were prepared to develop the channel design discharges.
Caltrans State Route 76- San Luis Rey River Sediment Transport Analysis, San Diego County—Project Manager for the HEC-6 hydraulic sediment transport analysis of the San Luis Rey River. The analysis was used to determine the entrenchment depth for the design of scour-counter measures within the river due to the widening of SR 76. The project also included feasibility studies and preliminary cost estimates for a variety of scour countermeasures to identify the most cost-effective design solution, since sour depths along the river bend were in excess of 20 feet. The analysis required close coordination with the County of San Diego and Caltrans Bridge Hydraulic Division.
Dennery Ranch Units 3A and 3B, City of San Diego—Project Manager for the preliminary and final design of the site storm drain and Otay River scour analysis. Work included Rational Method hydrologic and hydraulic analyses for the design of the onsite storm drainpipe improvements. Key features of the project were: 1) a fluvial-12 scour analysis, which was used to evaluate potential scour impacts associated with a relocated 30- inch trunk sewer line, and 2) the design of two Con-Arch culverts with Armor Flex protection. The sewer line was relocated within the development slope located along the floodplain fringe.
San Elijo Phase 2, City of San Marcos—Project Manager for the preliminary and final design of the storm drain and Copper Canyon Creek improvements, associated with Phase 2 of the San Elijo project. Work included Rational Method hydrologic and hydraulic analyses for the design of the onsite storm drainpipe improvements and erosion control facilities such as desilting basins. A key feature of the project were the design of a number of large downdrains impact structures that were used to decrease incoming discharge velocities in excess of 50 to 60 feet per second (fps) to 6-8 fps. Specific to the creek, approximately 2.0 miles of creek was improved to provide flood hazard protection for this new community. The channel improvements were designed using HEC-RAS to determine: 1) the new channel geometries and grades, and roadway culvert sizes, and 2) the type and extent of the scour protection measures.
University Commons Planning Area 11 Tentative Subdivision Map, City of Carlsbad—Project Manager for the preliminary design of drainage improvements for the proposed residential development. Work included hydraulic and hydrologic analyses for the design of the onsite storm drain improvements. The hydrologic analysis was performed per City of Carlsbad and County of San Diego drainage criteria and methodology.
Torrey Highlands, City of San Diego—Project Manager for the preliminary design of drainage improvements for the proposed residential development. Work included hydraulic and hydrologic analyses for the design of the onsite storm drain improvements. The hydrologic analysis was performed per City of San Diego drainage criteria and methodology.
San Elijo Ranch, San Marcos—Project Manager/Project Engineer for the design of the drainage facilities for the 3,300-lot planned residential community. Work included: 1) design of large diameter storm drain systems and box culverts, 2) design (using HEC-2) of channel improvements for the mitigation of wetlands, 3) design of detention facilities, and 4) design of erosion control measures within the Cooper canyon Creek and all drainage facilities. Scour analyses were prepared using regime equation, i.e., Blanch’s equation, to evaluate scours depths and scour counter- measures over the County Water Authority’s 110-inch diameter aqueduct.
Monte Vista Ranch Tentative Map Drainage Study, County of San Diego—Project Manager for the Hec-1 hydrologic analysis of San Vicente Creek. The hydrology was performed to determine preliminary flood boundaries for the proposed Monte Vista Ranch development. The 4,325 acre project is located upstream of the San Vicente Reservoir and is situated within the 22,000 acre watershed that drains into the reservoir. The County of San Diego’s Soil Conservation Service (SCS) curve number and unit hydrograph methods were used in the analysis.
San Diego Padres Ballpark, City of San Diego—Project Manager/Project Engineer for the design of the drainage facilities associated with the development of the downtown ballpark and adjacent retail commercial center. Coordination with the City of San Diego's engineering consultant was required to tie into the surrounding public facilities. Special attention in the hydraulic design was necessary due to the facility's close proximity to the San Diego Bay.
Flood Control/Environmental San Elijo Phase 1 and 2, City of San Marcos, California—Project Manager for the preliminary and final design of the Copper Canyon Creek mitigation improvements associated with Phase 2 of the San Elijo development project. The goal of the project was to provide a creek/channel designs that: 1) provide flood hazard mitigation, 2) comply with environmental resource agency permit requirements, 3) comply with San Diego County Flood Control and Regional Water Quality Control Board design criteria, and 4) protect County Water Authority and the Vallecitos Water District potable water pipelines that cross the creek.
The Army Corp of Engineers HEC-RAS computer model was used in both the preliminary and final engineering phases of the project to determine the appropriate creek geometries and profile grades and the type and extent of the scour protection measures. Scour protection measures that were evaluated for the creek included riprap, grouted riprap, Armorflec, Ajacs, and vegetation. Bureau of Reclamation scour methodology was used to determine the scour depth for the design of the scour protection entrenchment.
Rancho Santa Fe Road, City of Carlsbad—Project Manager for the Rancho Santa Fe Roadway project. Work included hydrologic and hydraulic investigations were used to evaluate existing storm drain facility capacities and, in the preliminary and final design of the projects, storm drain facilities. HEC-2 analyses of Encinitas Creek were also performed: 1) to evaluate flood impacts upstream and downstream of Rancho Santa Fe Road, 2) to design two new culverts beneath Rancho Santa Fe Road, and 3) to evaluate the need for and the design of scour countermeasures along the roadway and development fill slopes that extend into the creek. A key feature of the analysis was the development of two HEC-2 models, which were used to analyze culverts that at one point were hydraulically connected upstream of the roadway. Additionally, the HEC-2 analysis was used in the design of soft and hard scale scour protection measures commensurate with the environmental permit.
Lemoncrest Drainage Master Plan, County of San Diego—Project Manager for the Lemoncrest Drive Master Drainage Plan Study that was prepared for the County of San Diego. The focal point of the study was the evaluation and mitigation of flooding at Woodside Avenue and Lemoncrest Drive. Work included: 1) site investigations to verify existing drainage facility locations, sizes, physical condition, and area drainage patterns, 2) utility research, 3) hydrologic and hydraulic analyses to assess existing drainage facility capacity, 4) the design of new facilities, or rehabilitation/improvement of existing facilities, and 5) preparation of cost estimates. Hydrology for the project was performed using the County’s SCS table method and Modified Rational Method. The hydraulic analysis was performed using the WSPG hydraulic model.
Miramar Landfill Creek Improvement Project, City of San Diego—Project Manager for the creek improvement feasibility study associated with the Miramar Landfill. Work included HEC-1 hydrologic analysis to determine the 100-year design discharge and the development of creek improvement options, which were presented to City staff. Also, a number of field visits were conducted with scour protection manufacturers and City staff to determine the scour protection application that best fit actual site conditions. Gabion mattresses/baskets, Armorflex, and Ajacs were evaluated for the project. Concerning the hydrology, the County of San Diego’s Soil Conservation Service (SCS) curve number and unit hydrograph methods were used in the HEC-1 analysis.
Escondido Creek Hydraulic Design Concept Analysis, Escondido—Project Engineer for the Escondido wetland mitigation project associated with the Hale Avenue Resource Recovery Facility. The work included development of five creek improvement alternatives (using HEC-2) to mitigate for current flood conditions and environmental related impacts (vegetation). Work also included a qualitative evaluation of creek geomorphology and fluvial processes, the preparation of cost estimates, utility research, civil site grading, and final hydraulic report. The project required close coordination with City staff, environmental consultant, and resource agencies, which included the Federal Emergency Management Agency, Army Corps of Engineers, and California Department of Fish & Game.
Mission Valley West Trolley Extension, San Diego—Project Engineer for preliminary design of riverine wetland enhancement improvements within the San Diego River. Work included developing a mitigation site plan that involved the design of channel and erosion protection improvements. HEC-2 analyses were performed on various mitigation site plan options and trolley alignment alternatives to mitigate local and resource agency environmental concerns and to provide flood hazard protection, due to the construction of the trolley within the floodplain. Work also included the development of creek improvement alternatives that would preclude an increase in FEMA documented flood elevations so as to prohibit any increase in flood impacts within surrounding residential and commercial developments that discharge via storm drain into the river.
Otay Lakes Roads, Chula Vista—Project Engineer for the design of channel and drainage improvements for 2.5 miles of roadway. HEC-2 was used to evaluate the need for and design of erosion protective measures commensurate with resource agency permit design criteria. The channel was ultimately designed to accommodate a riparian environment.
Forester Creek Flood Control Channel, San Diego—Project Engineer for hydraulic design of channel improvements for a 1.2-mile segment of the creek. HEC-2 and STORMPLUS were used for the hydraulic analyses, design of the channel improvements, and the evaluation of floodplain modifications/impacts due to the project. A complex channel configuration was required to accommodate tight right-of-way constraints, FEMA-established flood elevations, and the presence of several existing bridges, tributaries, and sewer crossings. Project required close coordination with MTDB and structural and environmental subconsultants.
Cypress Canyon Creek Flood Control, San Diego—Project Engineer for hydraulic design of the flood control improvements within Cypress Canyon Creek. This creek is located just easterly of the Interstate 15/Poway Road intersection and is a tributary to Poway Creek. HEC-2 was used for the hydraulic flood impact analyses and design of channel improvements along the proposed access roadway that runs along the creek overbank. The roadway was designed to provide service access to the City’s Penasquitos sewer pump station. The project required close coordination with the City of San Diego, Army Corps of Engineers, and the environmental subconsultant. A mix of gabions and Armorflex was used to protect the creek and to promote the growth of vegetation.
South Santa Fe Roadway Creek Improvements, County of San Diego—Project Engineer for the hydraulic analysis of the Buena and Agua Hedionda Creeks, due to the proposed South Santa Fe roadway project. The work included HEC-RAS feasibly analyses for the evaluation of flood impacts, due to various grading alternatives. Of significant importance was the development of creek alternatives that would preclude an increase in FEMA-documented flood elevations. Eventually, the hydraulic analysis would be used in the preparation of a CLOMR/LOMR for the County of San Diego.
Scripps Poway Parkway, Poway—Project Engineer for the design of drainage improvements associated with the 4.5-mile roadway extension. Work included hydrologic and hydraulic investigations to evaluate existing storm drain facility capacities and preliminary and final design of storm drain facilities. HEC-2 analyses were performed to evaluate the need for and design of erosion protection measures for the large fill slopes that extend into various creeks and swales.
Telegraph Canyon Creek, Chula Vista—Project Engineer for the channelization of 2.5 miles of Telegraph Canyon Creek. HEC-2 was used: 1) to evaluate flood impacts due to the improvement of Telegraph Canyon Road, 2) set channel freeboard requirements commensurate with 100-year storm roadway design criteria, and 3) to determine the need for and extent of channel scour protection measures. The project required close coordination with the biologist to provide channel improvements that would satisfy resource agency environmental concerns.
FEMA Documentation Mojave County Flood Insurance Study—Project Engineer for the review of the hydrologic analysis approach and methodology used in the Mojave County Flood Insurance study (FIS). Work also included the review of previous hydrologic work performed by the Army Corp of Engineers for the project area and review of analysis methods developed by the Arizona Department of Transportation and Maricopa Flood Control.
Plum Canyon Development LOMR/CLOMR, City of Santa Clarita, California—Project Manager for the final design of the drainage improvements associated with the Plum Canyon development project. The hydrologic analyses and designs were prepared per Los Angeles County Flood Control drainage criteria. Work primarily included processing of hydrologic and hydraulic reports, and the processing of a CLOMR/LOMR package through LACFC and FEMA.
Menlo Park FEMA Study, Menlo Park—Project Manager for the hydraulic analysis of San Francisquito Creek associated with FEMA's Limited Map Maintenance Program. FEMA documentation was prepared on behalf of the City of Menlo Park. Work included: 1) hydraulic field investigations, 2) HEC-2 analyses to determine the base flood elevations (BFEs), 3) preparation of documentation for submittal to FEMA, and 4) participation in a City Council meeting to address questions from those citizens affected by the flood boundaries.
Escondido Creek Hydraulic Design and FEMA Floodplain Concept Analysis, City Escondido—Project Engineer for the preliminary analysis of Escondido Creek associated with the Hale Avenue Resource Recovery Facility. The work included development of five creek improvement alternatives (using HEC-2) to mitigate for current flood conditions and environmental related impacts (vegetation). Work also included a qualitative evaluation of creek geomorphology and fluvial processes, the preparation of cost estimates, utility research, civil site grading, and final hydraulic report. The project required close coordination with City staff, environmental consultant, and resource agencies, which included the Federal Emergency Management Agency, Army Corps of Engineers, and California Department of Fish & Game.
The improvements were also evaluated in light of a future CLOMR/LOMR submittal to FEMA by the City of Escondido, since the improvements would include grading into an existing floodway that is bound by levees, and the Hale Avenue Bridge and Escondido Creek concrete channel just easterly of the project.
Monte Vista Ranch-San Vicente Creek Floodway Study, San Diego County—Project Manager for the floodplain and floodway study associated with the development of the Monte Vista Ranch Bed and Breakfast Commercial Site. The site will be constructed along the overbank of the San Vicente River, which has a discharge of approximately 15,000 cfs. The analysis was used to satisfy County of San Diego flood control and environmental permitting requirements.
Cottonwood Creek LOMR, San Diego County—Project Engineer for the floodway analysis of Cottonwood Creek in San Diego County. Work included the use of the hydraulic HEC-2 model to evaluate the 100-year storm flood plain and floodway boundaries. The work was performed in anticipation of the submittal of a Letter of Map Revision to FEMA.
Sediment Transport and Bridge Scour Studies Escondido Creek HARRF Land Sewer Outfall Alignment Study—Project Manager for the Fluvial-12 and HEC-RAS analysis of 3 miles of Escondido Creek. This work was performed in support of a master plan study for the realignment and protection of the City of Escondido's main trunk sewer line. Additional work includes the preparation of cost estimates, coordination with resource agency and community outreach, and close coordination with City and County staff.
Bridge Scour Studies, Calaveras County—Project Manager for the study of Woods Creek in Jamestown, California. Work included field investigations, hydraulic analyses using HEC-2, scour analysis using FHWA methodology, and evaluation of scour countermeasures. An existing and proposed bridge conditions HEC-2 analysis was performed to satisfy FEMA flood impacts. Special construction of the new structure and creek improvements was also required due to stringent right-of-way constraints and adjacent structures.
Southline Drainage and Sedimentation Study, Metropolitan Transit Development Board, San Ysidro—Project Engineer for the development of remedial mitigation measures for the protection MTDB’s trolley track ballast. Work included field investigations associated with the hydrologic and hydraulic evaluation of various drainage facilities, as well as the development of sediment yield estimates at a number of the trolley track cross culverts.
Bridge Scour Studies, Colusa County—Project Manager for the hydraulic study of the Funks and Freshwater Lateral creeks in Colusa County. Work included field investigations, hydraulic analysis using HEC-RAS, scour analysis using FHWA methodology, and the evaluation and design of scour countermeasures. A FHWA Design Exception was prepared for those projects concerning the hydrology, since the creek could not convey the 100-year storm discharge due to the low riverbanks and perched bridge design.
Bridge Scour Study, Nevada County. Project Manager—Work included field investigations, hydrologic and hydraulic analyses, scour analysis using FHWA methodology, and the evaluation of and design of bridge scour countermeasures. Three methods of hydrologic analyses were performed for the 100-square-mile watershed. These methods included flood frequency analysis using stream gage information, regional regression equating, and SCS methods. An existing and proposed bridge condition HEC-RAS analysis was performed to evaluate flood impacts per FEMA criteria.
Mobley Canyon 16-Inch Gas Line Creek Remediation Project for SDG&E, San Diego—Project Manager for the development of creek remediation alternatives for the protection of SDG&E's 16-inch gas line. Work included: 1) a qualitative evaluation of creek geomorphology and fluvial process, 2) extensive fieldwork to determine the type of and placement of scour countermeasures in environmentally sensitive creek habitat, and 3) preparation of cost estimates, and field meetings with Gabion and Armorflex manufacturer's representatives and SDG&E's natural resource biologist.
NPDES Documentation Kelly Ranch Development Project, San Diego—Project Manager for the preparation of a NPDES documentation associated with County of San Diego Municipal Permit (Permit) compliance. The jurisdictional agencies include the City of Carlsbad and Coastal Commission. A water quality plan was prepared for this primarily residential development to address City and Coastal Commission storm water quality discharge into Agua Hedionda Lagoon. Contained in the plan were: 1) a BMP water quality scheme that showed the project specific BMPs, 2) flow- and volume-based support calculations (per the Permit) used to quantify and locate the BMPs, 3) manufactures BMP information, and 4) cost analysis.
Mission City North, San Diego—Project Manager for the preparation of a NPDES documentation associated with County of San Diego Municipal Permit (Permit) compliance. A preliminary water quality plan was prepared for Shea and Continental Homes to address potential water quality impacts to the project. The plan included: 1) a BMP water quality scheme that showed projects specific BMPs, 2) flow- and volume-based support calculations (per the Permit) used to quantify and locate the BMPs, 3) manufactures BMP information, and 4) cost analysis.
Bressi Ranch Development, San Diego—Project Manager for the preparation of a NPDES documentation associated with County of San Diego Municipal Permit (Permit) compliance. A preliminary water quality plan was prepared for Shea and Continental Homes to address potential water quality impacts to the project. The plan included: 1) a BMP water quality scheme that showed projects specific BMPs, 2) flow- and volume-based support calculations (per the Permit) used to quantify and locate the BMPs, 3) manufactures BMP information, and 4) cost analysis.
Construction SWPPP Preparation for Various Redevelopment Projects in San Diego County:· 1st and Robinson
· 5th and Redwood
· 10th and Market
· Entrada
· Kaiser Permanente Administration
· Carmel Ranch Neighborhood 10 Development, City of San Diego
· Black Mountain Development, City of San Diego
· Waters End Development, City of San Marcos
· Olive Hills Development, City of San Marcos
· Mission City North Development, City of San Diego
· The Bishop Schools Redevelopment Project, City of San Diego
· City of Chula Vista Civic Center Remodel
· Santa Fe Depot Development Project
· 4S Ranch Development Project, County of San Diego
Industrial SWPPP Preparation in San Diego County: · Legoland, Carlsbad: Project Manager/Project Engineer for the preparation of NPDES industrial/municipal Storm Water Pollution Prevention Plans.
· MTDB Bus and Trolley Maintenance Facilities: Project Manager/Project Engineer for the preparation of NPDES industrial/municipal Storm Water Pollution Prevention Plans.
Exponent Project Experience
Drainage Facility Design
Central Valley Business Park Drainage and Flood Control Study, Coachella Valley, CA—Project Manager/consultant for the design and hydraulic analysis of the flood control and detention improvements that were proposed for the Coachella Valley Business Park Development. Work included providing technical support in the areas of planning/design, and in the preparation and evaluation of the HEC-RAS analyses used in the design of the project’s detention basin, and channel improvements. A key feature of the project was the design of a spreading basin, which was used to release project flows in a manner consistent with existing downstream drainage patterns.
Desert Dunes Sediment Transport Evaluation and Design, Coachella Valley, CA—Project Manager for the design of the flood control improvements for the proposed Pulte Homes Desert Dunes single-family and golf course projects. The project site is located in the desert region of Coachella Valley in Riverside, California.