Storm Sewer System Analysis And Design

US-287 from SH 1 to La Porte Bypass Storm Sewer System

Colorado Department of Transportation, Region 4
Fort Collins, Colorado
La Porte Bypass

This 2-mile highway in urban settings required the design of a complex storm sewer system due to Right of Way constraints. Due to unavailability of land for conventional water quality ponds, in-line water quality vaults were recommended.

Project Highlights:
Objective:
  • Roadway widening project to improve traffic efficiency
Important features:
  • Major utility relocates
  • Major right-of-way constraints
  • Total of 3 storm sewer systems consisting of approximately 8000 feet of trunk line, 4500 feet of laterals, 50 manholes and inlets, and 5 water quality vaults
  • Used UD SEWER and In Roads Storm and Sanitary to complete storm sewer analysis
  • Preliminary design has been completed
a Porte Bypass US-287 from SH 1 to La Porte Bypass Storm Sewer System
INVESCO Field INVESCO Field at Mile High Stormwater Utilities

US-287 from SH 1 to La Porte Bypass Storm Sewer System

Colorado Department of Transportation, Region 4
Fort Collins, Colorado
La Porte Bypass

This 2-mile highway in urban settings required the design of a complex storm sewer system due to Right of Way constraints. Due to unavailability of land for conventional water quality ponds, in-line water quality vaults were recommended.

Project Highlights:
Objective:
  • Roadway widening project to improve traffic efficiency
Important features:
  • Major utility relocates
  • Major right-of-way constraints
  • Total of 3 storm sewer systems consisting of approximately 8000 feet of trunk line, 4500 feet of laterals, 50 manholes and inlets, and 5 water quality vaults
  • Used UD SEWER and In Roads Storm and Sanitary to complete storm sewer analysis
  • Preliminary design has been completed

INVESCO Field at Mile High Stormwater Utilities

HNTB Architects
Denver, Colorado
INVESCO Field

The project site is located in a heavily urbanized area adjacent to a major river at the confluence of three floodplain boundaries and is directly impacted by large volumes of runoff from two urban watersheds.

Project Highlights:
  • 2 separate storm drain systems
  • Realignment and replacement of 15 storm drain inlets
  • Installation of more than 3,000 feet of new storm sewer
  • 2 large non-conventional inlets/vaults and 2 concrete box culverts
  • Recommendations of non-structural and structural best management practices (BMPs)
  • Control system, within the stadium, to regulate between gray water discharge and stormwater runoff discharge
  • 8 water quality detention ponds and appurtenant outlet control structures