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Sewer Modeling Case Studies: How Customers Have Used HYDRA

Municipal engineers use HYDRA® software on hundreds of sewer modeling projects every year. Following are descriptions of a few recent sewer modeling projects using HYDRA. In these articles you can read descriptions of the challenges involved in the modeling projects, and resulting solutions.


Marine Terminal Drainage System Project
Client: Port Authority of New York and New Jersey
Consultant: DMJM Architects and Engineers, Newark, NJ

As part of redevelopment of the Elizabeth Port Authority Marine Terminal, including rail expansion and relocation, Port Authority engineers needed to develop an improved drainage system. They developed a HYDRA model to evaluate the drainage area during a 25-year storm and to determine the feasibility of a proposed pumping station to remove water from a street section to be lowered. The entire modeling project and report was completed in less than 80 hours.


Rehabilitation and Repair Project
Client: City of Beverly Hills, CA
Consultant: 3-Waters Technical Services, Solana Beach, CA

Project engineers used HYDRA to identify reaches in the collection system that were hydraulically overloaded. Because of the sensitivity of community relations issues related to pipeline replacements in the almost "built-out" condition of the City of Beverly Hills, rehabilitation was the preferred alternative to pipeline replacement to restore capacity. HYDRA's ability to individually track infiltration and inflow as separate components of a hydrograph helped to locate areas where rehabilitation efforts would result in needing the least amount of replacement piping. It is possible this aggressive rehabilitation program will eliminate the need for any pipeline replacements.


Capital Improvement Plan
Client: City of Sacramento, CA
Consultant: Carollo Engineers, Sacramento, CA

The City of Sacramento was experiencing severe surcharging, caused by a combination of undersized sewer mains and extensive infiltration from tree root invasion of pipes laid in back yards. As part of a systematic evaluation of its sanitary sewer, the City of Sacramento developed a HYDRA sewer model of one of its most problematic basins. Project engineers tested out several different scenarios, including rehabilitation and bypass pipeline alternative options. They compared costs and benefits in order to determine the most cost-effective improvements to perform over the next 3 years.


Naval Base Facility Rehabilitation Plan
Client: National Naval Medical Center, Bethesda, MD
Consultant: Michael Baker Jr., Inc., Alexandria, VA

The sewer system at the National Naval Medical Center needed to accomadate 10 years of growth at the least cost and with the least amount of disruption to hospital activities. Using a HYDRA sewer model, project engineers were able to create a plan to eliminate bottlenecks and adequately restore system capacity using trenchless system rehabilitation.
  Sanitary Sewer Modeling Project
Client: City of Surrey, BC
Consultant: Kerr Wood Leidal, Vancouver, BC

A HYDRA model was developed for the fast-growing city of Surrey, British, Columbia, to monitor the effect of growth on the operation of the sanitary sewer system and avoid backups or overflows. Project engineers used parcel data from the GIS and population data from the census to load the model. Two different growth scenarios were model, and it was determined that a planned new sewer would not be needed for another 5 years.


Comprehensive Land Use Planning
Client: City of Nampa, ID
Consultant: J-U-B Engineers, Boise, ID

As part of a periodic review of their land use plan, the City Council of Nampa, Idaho, developed a HYDRA sewer model to determine how their land use decisions would impact the sanitary sewer system. Using the sewer model, policy-makers were able to readily understand the ramifications of their land use decisions on long-term infrastructure costs. The model showed, for example, that new development on the east side of the city would have required large-scale improvements to the trunk system. The City Council instead opted to put the new land use in another area of the city, preventing costly infrastructure improvements in the future.


Sanitary Sewer Master Plan and Development Impact Fee Study
Client: New Braunfels Utilities, New Braunfels, TX
Consultants: Camp Dresser & McKee and Rimrock Consultants

As part of a sanitary sewer master plan for the fast-growing community of New Braunfels, Texas, project engineers did a capacity analysis using HYDRA to distinguish between the portion of improvements required to serve existing residents and those attributed to new developments. As a related process, an impact fee study will be used by an advisory committee to make recommendations to the city council on the fees to be adopted by the utilities board.
See the article


Infiltration and Inflow Study
Client: City of South Fan Francisco, CA
Consultant: Carollo Engineers, Fresno, CA

As part of an order from the State Regional Water Quality Control Broad, the city conducted a study to evalutate the hydraulic capacity of the existing sewer collection system and recommended ways to mitigate the surcharge and overflows caused during rainfall events. The HYDRA model was used to identify and prioritize bottlenecks, so early modifications would have the greatest effect on reducing overflows.
 


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