Project Lead

Pasadena Water & Power Department


Carollo Engineers' team was assembled to bring together experienced and local professionals who have successfully worked on projects with similar issues and challenges in the past. This team has specific expertise in local water resources.

Carollo Engineers

Sub consultants include GEOSCIENCE for hydrological and hydrogeological analysis, Bonterra for environmental compliance, GEI for geotechnical consulting and Questa Engineering for the restoration portion of the project. Questa specializes in resource-based design, including stream, fish passage, wetlands restoration, habitat enhancement, biotechnical bank stabilization, bicycle and pedestrian pathway planning, and wastewater and stormwater management.

Bonterra Psomas

Questa Engineering Corporation

Planning Documents and Studies Supporting the Arroyo Seco Canyon Project

Final Feasibility Study Report, Proposed Percolation System, Leased East Parking Lot, Arroyo Seco Spreading Grounds
Converse Consultants West - 1995
Pasadena, CA

Hydrogeologic Investigation, Devil's Gate Water Collection Tunnel
Converse Consultants West - 1995
Pasadena, CA
The purpose of this investigation was to evaluate geologic and hydrogeologic information in the tunnel area and determine the amount of groundwater that can percolate into the tunnel considering various hydrogeologic scenarios

Analysis Flood Hazard, Sediment Management, and Water Feature Analyses, Hahamongna Watershed Park
Philip Williams & Associates - 2000
Pasadena, CA

Arroyo Seco Watershed Restoration Feasibility Study - 2002
The goal of the study was to develop a comprehensive, long-term plan to restore and enhance the Arroyo Seco. Major elements of the study considered flood and stream management, habitat restoration, water resources and recreational opportunities.

Habitat Restoration for the Arroyo Seco Watershed (ASWRFS Appendix F) - 2002
The Arroyo Seco watershed spans a diversity of habitat types and conditions. Restoration efforts must consider relatively intact, but threatened ecosystems within the Angeles National Forest as well as highly degraded habitats in urban areas.

Arroyo Seco Watershed Assessment - 2010
A comprehensive review of the state of the watershed and of projects to restore and enhance it. ASWA builds on the body of research, plans and reports that have been prepared in the last ten years to chart the course for an Arroyo Seco Greenway that will provide for restoration and better management of our local watershed.

Upper Arroyo Seco Watershed Integrated Spreading Grounds — 2011
A comphrensive plan prepared by CDM in 2011 for an integrated approach to the water diversion and percolation facilities in the Arroyo Seco canyon and the Hahamongna basin.