RGA's Drainage and Hydrology Experience
Return to Drainage and Hydrology main page.
20-Mile Regional Storm Facility
Client: Town of Parker and Urban Drainage and Flood Control District (UDFCD)
Description: RGA designed two (2) cell inter-connected regional detention ponds along Plaza Drive adjacent to Cherry Creek. The project involved evaluation of the alignment and hydraulics, approvals from federal, state and local agencies, and construction management. RGA provided the design and construction management for the installation of a 40.5 acre-feet regional detention facility. The basin analysis for the 395 tributary acres was modeled using CUHP and SWMM hydrology for the existing and proposed land uses as dictated by the Newlin & Baldwin Gulches and Basin 4600-09 Outfall System Planning Study. The regional facility consisted of hydraulically connected dual detention ponds with sediment collection cells and 10.0 acre-feet of controlled release water quality storage. The design of this facility also included several box culverts and a 54-inch storm sewer system. The 570 cubic-feet per second released into an environmentally sensitive area of Cherry Creek from the detention facility is controlled by a concrete multi-staged weir and a grouted sloping boulder drop structure.
Description: RGA designed two (2) cell inter-connected regional detention ponds along Plaza Drive adjacent to Cherry Creek. The project involved evaluation of the alignment and hydraulics, approvals from federal, state and local agencies, and construction management. RGA provided the design and construction management for the installation of a 40.5 acre-feet regional detention facility. The basin analysis for the 395 tributary acres was modeled using CUHP and SWMM hydrology for the existing and proposed land uses as dictated by the Newlin & Baldwin Gulches and Basin 4600-09 Outfall System Planning Study. The regional facility consisted of hydraulically connected dual detention ponds with sediment collection cells and 10.0 acre-feet of controlled release water quality storage. The design of this facility also included several box culverts and a 54-inch storm sewer system. The 570 cubic-feet per second released into an environmentally sensitive area of Cherry Creek from the detention facility is controlled by a concrete multi-staged weir and a grouted sloping boulder drop structure.
20th Street Bus/HOV Corridor, Chestnut to Downtown
Location: Denver, Colorado
Description: As a subconsultant, RGA was retained by the Denver Regional Transportation District (RTD) to provide drainage and traffic engineering design services for the improvement of 20th Street from Chestnut to Arapahoe near the Denver Central Business District. Improvements in the 20th Street corridor included roadway widening, drainage improvements and bridge construction to accommodate a proposed exclusive bus/HOV lane from downtown to I-25. Unique project elements included advance signing plans for the reversible bus/HOV ramps and coordination with vehicle/pedestrian planning for the proposed major league baseball stadium located immediately adjacent to the project site.
Description: As a subconsultant, RGA was retained by the Denver Regional Transportation District (RTD) to provide drainage and traffic engineering design services for the improvement of 20th Street from Chestnut to Arapahoe near the Denver Central Business District. Improvements in the 20th Street corridor included roadway widening, drainage improvements and bridge construction to accommodate a proposed exclusive bus/HOV lane from downtown to I-25. Unique project elements included advance signing plans for the reversible bus/HOV ramps and coordination with vehicle/pedestrian planning for the proposed major league baseball stadium located immediately adjacent to the project site.
Betts Ranch
Location: Douglas County, Colorado
Description: The RGA team performed hydrology analysis and prepared master storm drain plan for this 2,500-acre proposed development near Parker, Colorado. The plan and accompanying report presented preliminary design and cost estimates for the major drainage facilities.
Description: The RGA team performed hydrology analysis and prepared master storm drain plan for this 2,500-acre proposed development near Parker, Colorado. The plan and accompanying report presented preliminary design and cost estimates for the major drainage facilities.
Bond Park Phases I and III
Client: Town of Estes Park, Colorado
Description: RGA assisted the design team with the reconstruction of Bond Park upgrades and improvements. This project included: storm sewer, channelization and infiltration system to eliminate existing pond of water and other drainage problems; underground conduit bank for irrigation control wires, utilities, fiber options, and electrical system; replacing asphalt pavement with decorative stones; incorporating parking delineation in decorative stone pattern to eliminate typical painted stripes; eliminating curb and gutter; 3-foot high rock boulder bollards to replace typical parking blocks; and flowing curvilinear roadway, sidewalks and planter beds.
Description: RGA assisted the design team with the reconstruction of Bond Park upgrades and improvements. This project included: storm sewer, channelization and infiltration system to eliminate existing pond of water and other drainage problems; underground conduit bank for irrigation control wires, utilities, fiber options, and electrical system; replacing asphalt pavement with decorative stones; incorporating parking delineation in decorative stone pattern to eliminate typical painted stripes; eliminating curb and gutter; 3-foot high rock boulder bollards to replace typical parking blocks; and flowing curvilinear roadway, sidewalks and planter beds.
Cherry Creek Diversion Facility
Client: Parker Water and Sanitation District
Description: The firm designed a structure on Cherry Creek to divert water to a pump station supplying the Rueter-Hess Reservoir. The final structure has a wide foundation constructed perpendicular to the flow of Cherry Creek with retaining walls along each bank. The project utilized 2,340 CY of reinforced concrete and required a major dewatering effort. The RGA team also completed all construction management and administration for the project.
Description: The firm designed a structure on Cherry Creek to divert water to a pump station supplying the Rueter-Hess Reservoir. The final structure has a wide foundation constructed perpendicular to the flow of Cherry Creek with retaining walls along each bank. The project utilized 2,340 CY of reinforced concrete and required a major dewatering effort. The RGA team also completed all construction management and administration for the project.
City of Edgewater, Colorado
22nd Avenue
Designed curb and gutter, crosspans, inlets, and underground drainage collection system in conjunction with the reconstruction of one-half mile of street.
Ashland Drain Line
Coordinated T.V. investigation of 4,000 feet of old storm drain, and developed a program for replacing or sliplining damaged portions of the line. Provided design and construction administration for sliplining a portion of the line.
North Reach Sloan's Lake Drainage
As the City of Edgewater's City Engineer, coordinated UD&FCD design of improvements for the North Reach of the Sloan's Lake drainage through Edgewater. Originated concept of utilizing Citizen's Park for a detention basin to remove commercial area along Sheridan from the 100-year flood plain.
South Reach of Sloan's Lake Channel
Coordinated regrading and rehabilitation of the Sloan's Lake Channel through the new Edgewater Marketplace development.
Designed curb and gutter, crosspans, inlets, and underground drainage collection system in conjunction with the reconstruction of one-half mile of street.
Ashland Drain Line
Coordinated T.V. investigation of 4,000 feet of old storm drain, and developed a program for replacing or sliplining damaged portions of the line. Provided design and construction administration for sliplining a portion of the line.
North Reach Sloan's Lake Drainage
As the City of Edgewater's City Engineer, coordinated UD&FCD design of improvements for the North Reach of the Sloan's Lake drainage through Edgewater. Originated concept of utilizing Citizen's Park for a detention basin to remove commercial area along Sheridan from the 100-year flood plain.
South Reach of Sloan's Lake Channel
Coordinated regrading and rehabilitation of the Sloan's Lake Channel through the new Edgewater Marketplace development.
Clarke Farms
Location: Parker, Colorado
Description: The RGA team completed design of all grading, drainage and landscaping work for the Clarke Farms Wellhouse and Pump Station.
Description: The RGA team completed design of all grading, drainage and landscaping work for the Clarke Farms Wellhouse and Pump Station.
Drainage Study - City of Blackhawk, Colorado
Description: The RGA team prepared hydrological and hydraulics analysis for the entire city, including 100-year flood boundaries and proposed drainage improvements.
Drainage Study - Highlands Ranch, Colorado
Description: The RGA team prepared the final drainage studies for approximately 5,000 single-family lots, including inlet and storm sewer sizing and design, as well as sizing of major drainageway culverts for Mission Viejo.
E-470 Public Highway Authority
Location: Englewood, Colorado
Description: Performed hydrology analysis for 800-acre future multi-use development area, contributing storm flows which required conveyance under a portion of the E-470 freeway. Designed three major storm water detention facilities, including channelization, inlet and outlet structures, and landscaping. One detention pond was designed to maintain a permanent water pool of 1.5 acres. The resultant pond, containing a fountain and surrounded by sod and landscaping, doubled as a project amenity.
Description: Performed hydrology analysis for 800-acre future multi-use development area, contributing storm flows which required conveyance under a portion of the E-470 freeway. Designed three major storm water detention facilities, including channelization, inlet and outlet structures, and landscaping. One detention pond was designed to maintain a permanent water pool of 1.5 acres. The resultant pond, containing a fountain and surrounded by sod and landscaping, doubled as a project amenity.
Floodplain Modification Study - Eagle Creek
Location: Arapahoe County, Colorado
Description: The RGA team prepared a floodplain modification study, including HEC 2 analysis for Arapahoe Road Industrial Park, to remove a portion of the site from the Cherry Creek floodplain. A FEMA LOMR was obtained for this site.
Description: The RGA team prepared a floodplain modification study, including HEC 2 analysis for Arapahoe Road Industrial Park, to remove a portion of the site from the Cherry Creek floodplain. A FEMA LOMR was obtained for this site.
Four Lakes Drainageway
Location: Arapahoe County, Colorado
Description: RGA was retained by the Urban Drainage and Flood Control District to design the rehabilitation of 2,300 feet of an existing channel, including regrading, seven drop structures approximately 2.5 feet in height, access road, and concrete and rock trickle channel.
Description: RGA was retained by the Urban Drainage and Flood Control District to design the rehabilitation of 2,300 feet of an existing channel, including regrading, seven drop structures approximately 2.5 feet in height, access road, and concrete and rock trickle channel.
I-25 and 38th Avenue/Fox Street Interchange
Location: Denver, Colorado
Description: As part of a freeway corridor improvement project of the Colorado Department of Transportation, RGA was retained, as a subconsultant, to provide conceptual, preliminary and final design reports and plans for the reconstruction of this major interchange. The selected design, provided for highway widening to accommodate HOV lanes, a braided ramp and collector-distributor road system, and provision for a 2,500-foot "flyover" ramp from southbound I-25 into downtown Denver. The project scope included a complete drainage report for the interchange, including all ramps and infield area, earthwork studies, and the design of improvements to Fox Street and Globeville Road in the vicinity of the interchange.
Description: As part of a freeway corridor improvement project of the Colorado Department of Transportation, RGA was retained, as a subconsultant, to provide conceptual, preliminary and final design reports and plans for the reconstruction of this major interchange. The selected design, provided for highway widening to accommodate HOV lanes, a braided ramp and collector-distributor road system, and provision for a 2,500-foot "flyover" ramp from southbound I-25 into downtown Denver. The project scope included a complete drainage report for the interchange, including all ramps and infield area, earthwork studies, and the design of improvements to Fox Street and Globeville Road in the vicinity of the interchange.
I-25 and 58th Avenue Interchange Reconstruction
Location: Adams County, Colorado
Description: As a subconsultant, RGA was retained by the Colorado Department of Transportation, Region VI, to provide drainage and traffic engineering design services for the reconstruction of the I-25/58th interchange and the adjacent local arterial system. Services included the design of a local storm sewer system for 58th Avenue and Broadway, and the design of traffic signals at 58th/Logan Court, 58th/East Ramp, 58th/West Ramp, 58th/Broadway and 53rd/Bannock.
Description: As a subconsultant, RGA was retained by the Colorado Department of Transportation, Region VI, to provide drainage and traffic engineering design services for the reconstruction of the I-25/58th interchange and the adjacent local arterial system. Services included the design of a local storm sewer system for 58th Avenue and Broadway, and the design of traffic signals at 58th/Logan Court, 58th/East Ramp, 58th/West Ramp, 58th/Broadway and 53rd/Bannock.
I-270 Drainage Design
Location: Adams County, Colorado
Description: The RGA team led the evaluation and design of drainage structures and systems for the extension of I-270 from I-76 to the I-25/U.S. 36 interchange. The I-270 extension is one of the most complex systems of consecutive interchanges in the State of Colorado. Design services included the conceptual drainage design for all phases of the project.
Description: The RGA team led the evaluation and design of drainage structures and systems for the extension of I-270 from I-76 to the I-25/U.S. 36 interchange. The I-270 extension is one of the most complex systems of consecutive interchanges in the State of Colorado. Design services included the conceptual drainage design for all phases of the project.
Jewish Community Center
Location: Denver, Colorado
Description: The RGA team analyzed drainage problems on-site for rehabilitation to be done with construction of building additions. Work included identification of problem areas, recommendation of solutions, cost estimates, and construction plans for the selected rehabilitation.
Description: The RGA team analyzed drainage problems on-site for rehabilitation to be done with construction of building additions. Work included identification of problem areas, recommendation of solutions, cost estimates, and construction plans for the selected rehabilitation.
Master Drainage Plan - Bromley Park Metropolitan District
Location: Brighton, Colorado
Description: RGA was retained by the Bromley Park Metropolitan District to prepare a Master Drainage Plan for the 3,000-acre Bromley Park Development within the City of Brighton. This plan is being utilized to design all storm drainage facilities within the District. The plan was complicated by the necessity of accommodating two major irrigation canals, Interstate I-76, and the Burlington Railroad. All of the facilities traversed the Development. the Master Plan also addressed and set requirements for designing water quality measures.
Description: RGA was retained by the Bromley Park Metropolitan District to prepare a Master Drainage Plan for the 3,000-acre Bromley Park Development within the City of Brighton. This plan is being utilized to design all storm drainage facilities within the District. The plan was complicated by the necessity of accommodating two major irrigation canals, Interstate I-76, and the Burlington Railroad. All of the facilities traversed the Development. the Master Plan also addressed and set requirements for designing water quality measures.
Master Drainage Plan - City of Trinidad, Colorado
Description: This Master Drainage Plan included mapping and inventory of existing conditions and computer modeling to develop a plan for relieving existing deficiencies and guiding future development within the City. Concurrent with preparation of the Master Drainage Plan, RGA prepared drainage design and construction standards for development within the City.
Master Drainage Plan - Town of Estes Park, Colorado
Client: Town of Estes Park, Colorado
Description: The Estes Park Drainage Master Plan provides an overall guide for the regionalized study areas to aid in the planning of future actions and improvements. The Plan coordinates the use of open spaces, rights of way, drainage tracts and easements in order to recommend environmentally conscious hydraulic design to remedy existing problems and areas where problems occur. The study area was 1,400 acres and planned for open spaces, transportation, water quality, water storage, flood plain mitigation, wildlife and other emerging urban/commercial considerations.
Description: The Estes Park Drainage Master Plan provides an overall guide for the regionalized study areas to aid in the planning of future actions and improvements. The Plan coordinates the use of open spaces, rights of way, drainage tracts and easements in order to recommend environmentally conscious hydraulic design to remedy existing problems and areas where problems occur. The study area was 1,400 acres and planned for open spaces, transportation, water quality, water storage, flood plain mitigation, wildlife and other emerging urban/commercial considerations.
Meadows Town Center
Client: Castle Rock Development Company
Description: This project included approximately 420 single-family and 2,402 multi-family dwelling units with 23 acres of commercial development. RGA provided engineering services for all civil design, from sketch plan through construction document approval. Design challenges included balancing earthwork activities over 1,200,000 cubic yards of material, connection of major infrastructure utilities through the property and incorporating a meandering drainageway. Drainage improvements included piping the 100-year upstream contributions through the property.
Description: This project included approximately 420 single-family and 2,402 multi-family dwelling units with 23 acres of commercial development. RGA provided engineering services for all civil design, from sketch plan through construction document approval. Design challenges included balancing earthwork activities over 1,200,000 cubic yards of material, connection of major infrastructure utilities through the property and incorporating a meandering drainageway. Drainage improvements included piping the 100-year upstream contributions through the property.
Niver Creek Rehabilitation and Maintenance Project
Location: Thornton, Colorado
Description: For the Urban Drainage and Flood Control District (UDFCD), RGA prepared the design for the rehabilitation of 3,000 feet of an existing channel. The design included grading, channel protection, and numerous hydraulic drop structures ranging from 3 to 15 feet in height.
Description: For the Urban Drainage and Flood Control District (UDFCD), RGA prepared the design for the rehabilitation of 3,000 feet of an existing channel. The design included grading, channel protection, and numerous hydraulic drop structures ranging from 3 to 15 feet in height.
Red Hawk Channel Improvements
Client: Lennar Homes
Description: RGA provided the design of drainage channel improvements within the Red Hawk Development in Castle Rock, Colorado, which included channel realignment, channel grading, two (2) drainageway culverts, and three (3) drop structures. RGA prepared and received approvals for a CLOMR and LOMR for this project.
Description: RGA provided the design of drainage channel improvements within the Red Hawk Development in Castle Rock, Colorado, which included channel realignment, channel grading, two (2) drainageway culverts, and three (3) drop structures. RGA prepared and received approvals for a CLOMR and LOMR for this project.
Stonegate Developments, Inc.
Location: Douglas County, Colorado
Description: Preparation of a final drainage study for three single family filings, including sizing and design of inlets and storm sewer. The RGA team also prepared a Master Drainage Study for 500-acre, multi-use project. Used the CUHP computer model for runoff and UDSWM computer program for routing through series of detention facilities. Utilizing base data from an Army Corps of Engineers floodplain study, analyzed the capacity of Cherry Creek channel at the Lincoln Avenue bridge crossing in Douglas County. The study analyzed the effects of various storm flood frequencies on the existing bridge structure and explored alternative bridge configurations and possible channel alterations. A report was prepared which presented the potential flood limits and cost estimates for constructing the various alternatives.
Description: Preparation of a final drainage study for three single family filings, including sizing and design of inlets and storm sewer. The RGA team also prepared a Master Drainage Study for 500-acre, multi-use project. Used the CUHP computer model for runoff and UDSWM computer program for routing through series of detention facilities. Utilizing base data from an Army Corps of Engineers floodplain study, analyzed the capacity of Cherry Creek channel at the Lincoln Avenue bridge crossing in Douglas County. The study analyzed the effects of various storm flood frequencies on the existing bridge structure and explored alternative bridge configurations and possible channel alterations. A report was prepared which presented the potential flood limits and cost estimates for constructing the various alternatives.
Sulphur Gulch Channel Improvements
Client: Town of Parker and Urban Drainage and Flood Control District (UDFCD)
Description: RGA designed 850 LF of channel improvements along Sulphur Gulch adjacent to the Bar CCC Park. The project involved evaluation of the alignment, approvals from federal, state and local agencies and construction management. Channel improvements included a sculptured concrete drop structure, grouted riprap grade control structure and buried riprap channel revetment. Design parameters included design coordination with existing bridge abutments and piers, the connection and re-alignment of the Town of Parker Regional Trail System, access from the Bar CCC parking area, and the synchronization with the existing Parker Water and Sanitation District mixing station and associated outfall/channel improvements to Sulphur Gulch at the termination of this project.
Description: RGA designed 850 LF of channel improvements along Sulphur Gulch adjacent to the Bar CCC Park. The project involved evaluation of the alignment, approvals from federal, state and local agencies and construction management. Channel improvements included a sculptured concrete drop structure, grouted riprap grade control structure and buried riprap channel revetment. Design parameters included design coordination with existing bridge abutments and piers, the connection and re-alignment of the Town of Parker Regional Trail System, access from the Bar CCC parking area, and the synchronization with the existing Parker Water and Sanitation District mixing station and associated outfall/channel improvements to Sulphur Gulch at the termination of this project.
Thornton Trail and Niver Creek Drop Structure
Location: Thornton, Colorado
Description: RGA provided the design and construction administration for the replacement of a damaged drainage structure. The 15-foot-high concrete baffled chute structure also doubled as a stream crossing for a segment of the City's trail system. The walls at the top of the drop structure were designed to accommodate a 37-foot span steel truss bridge.
Description: RGA provided the design and construction administration for the replacement of a damaged drainage structure. The 15-foot-high concrete baffled chute structure also doubled as a stream crossing for a segment of the City's trail system. The walls at the top of the drop structure were designed to accommodate a 37-foot span steel truss bridge.
Return to Drainage and Hydrology main page.
