Major Drainage Planning and Design

Cottonwood Creek Stabilization

Urban Drainage and Flood Control District
Caley Avenue to Peoria, Denver, Colorado
Cottonwood Creek

Hydraulic studies of the area were performed by JFSA to determine problem areas. The proposed improvements included the implementation of drop structures, reducing bank side slopes, and the addition of vegetation. Bioengineering methods were recommended wherever possible in order to increase water quality and integrate the improvements into their natural surroundings, so as to combine smoothly with the existing recreational trail aesthetics.

Objective:
  • Stop massive destabilization caused by stormwater
  • Arrest receding bank lines
  • Improve safety concerns
  • Maintain aesthetics
Featured Design Solutions:
  • Addition of 100-year drop structures
  • Reduction of bank side slopes
  • Low water stream crossing and trail extension
  • Vegetation enhancement to blend with surroundings
  • Educational signage to increase awareness
Transmission Facility Cottonwood Creek Stabilization
Bergen Reservoir Tributary to Weaver Creek Outfall Systems Planning
Over The River Art Project Stormwater Planning and Design for I-70 near City of Burlington
Over The River Art Project Improvements to Dad Clark Gulch Downstream of Southpark Terrace
Over The River Art Project Happy Canyon Creek Restoration at Surry Ridge

Cottonwood Creek Stabilization

Urban Drainage and Flood Control District
Caley Avenue to Peoria, Denver, Colorado
Cottonwood Creek

Hydraulic studies of the area were performed by JFSA to determine problem areas. The proposed improvements included the implementation of drop structures, reducing bank side slopes, and the addition of vegetation. Bioengineering methods were recommended wherever possible in order to increase water quality and integrate the improvements into their natural surroundings, so as to combine smoothly with the existing recreational trail aesthetics.

Objective:
  • Stop massive destabilization caused by stormwater
  • Arrest receding bank lines
  • Improve safety concerns
  • Maintain aesthetics
Featured Design Solutions:
  • Addition of 100-year drop structures
  • Reduction of bank side slopes
  • Low water stream crossing and trail extension
  • Vegetation enhancement to blend with surroundings
  • Educational signage to increase awareness

Bergen Reservoir Tributary to Weaver Creek Outfall Systems Planning

Urban Drainage and Flood Control District
Jefferson County, Colorado

A master drainage planning project was completed by JFSA for an 820 acres watershed consisting mainly of residential building in Jefferson County Colorado. The projects consisted of a hydrologic and hydraulic analysis, developing a matrix of six alternatives, and preliminary design of the selected alternative. The major components of the recommended plan were a regional detention pond and conveyance elements in the urbanized portion of the watershed.

Objective:
  • Outfall systems planning for UDFCD
Important Features:
  • Hydrologic and hydraulic studies using CUHP and SWMM
  • Alternative selection and evaluation
  • Interactive meeting sessions with stakeholders
  • Preliminary design and cost estimate of selected alternative Hydrology and Preliminary Design Reports

Stormwater Planning and Design for I-70 near City of Burlington

Colorado Department of Transportation, Region 1
Colorado
Stormwater Planning and Design for I-70 near City of Burlington

JFSA prepared a SWMM5.0 model that covered the Town of Burlington consisting of about 670 acres. Alternative configurations of the drainage system were proposed and modeled. The alternatives included detention, addition of pipes, rerouting of flows, and upsizing of existing features. The recommended alternative removed the flooding issues by using new box culverts while avoiding issues associated with obtaining new Right of Way.

Objective:
  • Improvements to 4 miles of I-70 at City of Burlington
Important features:
  • Capacity analysis of 60 cross culverts
  • Development of CUHP and EPA-SWMM 5 to update drainage study of City of Burlington
  • Design of 10 replacement box culverts and 20 pipes, with wing walls, headwall, and energy dissipaters
  • Hydraulic analysis of approx. 3 miles of drainage channels
  • Used both HY-8 program and CULVERT MASTER to verify capacity of culverts

Improvements to Dad Clark Gulch Downstream of Southpark Terrace

Urban Drainage and Flood Control District
South Park Terrace, Douglas County, Colorado

The design of channel improvements consisted of replacement of culvert outlet end sections, a grouted sloping boulder drop structure, sheet pile cutoff check structures, channel modifications and armoring, and related details. Steep embankment along the southern edge of the channel required the development of a stacked boulder wall that provided embankment protection and a favorable aesthetic appearance while providing flood conveyance through a constricted section of channel.

Project Highlights:

Happy Canyon Creek Restoration at Surry Ridge

Urban Drainage and Flood Control District
Castle Rock, Douglas County, Colorado

Final design of improvements for creek rehabilitation including grade control structures, channel embankment protection and selective grading. Project involved coordination with US Army Corps of Engineers to obtain an Individual 404 Permit. Wetlands impacts were evaluated and a mitigation plan prepared. Floodplain mapping was done as part of this project. JFSA developed mapping and right-of-way plans. Drop structure design was developed to blend with character of surroundings using sculpted concrete.

Objective:
  • Restoration of recreational use alongside the creek
  • Protection from future flood events through a relatively narrow and erodible reach
  • Limited adverse impacts on ecological and habitat resources
  • Interaction with property owners to satisfy design objectives of residents
Featured Design Solutions:
  • Addition of 100-year sculpted concrete drop structures to mimic natural rock outcroppings of the capstone of Dawson Foundation
  • Eight grade control structures strategically located along the project reach
  • 100-year floodplain delineation for guidance to county to regulate flood conveyance along the project reach