I/I Studies

Hydraulic Modeling

Design & Construction

Operation & Maintenance

cMOM Compliance

Master Planning

Pipedream©

Arizona

PROJECTS:  Sanitary Sewer Hydraulic Modeling
                             CMOM Risk Assessment, Asset Management & Master Plan
                             Hydraulic Model Validation & Update Projects
                             SSES & I/I Pilot Study
LOCATION: City of Phoenix, Arizona
SCHEDULE: 1993 - present
PROJECT BACKGROUND:
Faced with a current hydraulic model that was difficult to use, awkward to update, and provided only questionable results, the City of Phoenix issued a request for proposals to replace it. Officials reviewed various modeling proposals and selected Wade & Associates, Inc. to provide modeling engineering and software. The firm proposed use of the hydraulic modeling software, Pipedream© that they developed to address modeling problems and complexities that cities and wastewater agencies typically encounter.

PROJECT SCOPE:
Wade & Associates developed the initial hydraulic model in association with the prime consultant who was responsible for the overall collection system master plan.

Beginning in 1993, Wade & Associates was responsible for the development, calibration, and implementation of a long-term hydraulic model of the City’s 23.0 million feet of sanitary sewer. As part of the model development phase, Wade selected and installed temporary wastewater flow monitors at 104 key locations in the system. Results of the flow monitoring work were used to calibrate the initial model to current flow conditions. The model currently includes all publicly owned sewer pipe, manholes, pump stations and diversion structures for the City. In addition to flow data, the project team collected several types of infrastructure data, including information from City-owned (permanent) meters, pump station data, network information from utility quarter-section maps, as-built record drawings and limited field surveys.

In 2003, Wade was selected to be part of a larger consultant team to help implement the City’s CMOM Risk Assessment, Baseline Asset Management Assessment & Master Plan. The program included a data audit and data gap analysis of existing wastewater data components including GIS/database systems, maintenance records, and records of Sanitary Sewer Overflows (SSOs).  As a key component of their CMOM objective, the City also addressed system capacity assurance. An evaluation of previous SSO causes and locations was conducted and identifed areas of future concern within the system and within the computerized hydraulic model.

As part of the City’s Phase I CMOM Capacity Assurance Program, Wade & Associates again (in 2003) deployed 91 temporary flow monitors throughout the collection system in lines ranging from 12” to 72” in diameter. Flow data was compiled and analyzed from the temporary meters and pumping stations, as well as multiple permanent customer city meters that included identified major flow contributors from industry and institutions. The City’s hydraulic model was recalibrated to identify lines with existing peak daily flow exceeding 80% of existing pipe capacity. Where system bottlenecks were identified, Wade & Associates (using GPS methods), field verified the accuracy of as-built data used to construct the hydraulic model. The surveying program included approximately 700 nodes. This verification process exposed an unusually high number of errors from as-built data (approximately 50% error). It was decided that the remaining interceptor sewers (lines 10” in diameter or larger) should also be surveyed. As a result, the City of Phoenix has contracted Wade to conduct a comprehensive GPS survey validation and corresponding hydraulic model update as part of the City’s SSES and Inflow/Infiltration Pilot Study. Wade is implementing a GPS fixed signaling methodology to capture x,y coordinates and z elevations to assure survey level accuracy for approximately 15,200 interceptor manholes. The hydraulic model will be updated with the new accurate physical structure elements.

In addition to the GPS survey validation, Wade & Associates is conducting a sanitary sewer evaluation in basins A03 and N03 of the City’s collection system to analyze wet-weather inflow/infiltration storm response identified in the 2003 flow monitoring program.  Wade deployed 171 temporary flow monitors in December, 2005, at key locations in the basins for a 120 day period in an effort to quantify system I/I. Other SSES services provided by Wade for the pilot study include approximately 1,650 manhole inspections, corresponding visual pipe inspections, smoke testing of approximately 400,000 lf of sanitary sewer, and approximately 36,000 lf of pipeline cleaning and CCTV inspections. Peak I/I rates and I/I source rankings will be determined for the study area. A cost-effectiveness analysis will be conducted identifying a least-cost plan for I/I elimination and submitted to the City with recommendations for rehabilitation and improvements to the collection system.

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PROJECT: Flow Monitoring Program for
                             Water and Wastewater Asset and Capacity Management Program
LOCATION: Scottsdale, Arizona
SCHEDULE: 2006
PROJECT SCOPE:
Wade & Associates, working with Carollo Engineers, is implementing a flow monitoring program as part of the City of Scottsdale, Arizona's Water and Wastewater Asset and Capacity Management Program.  Wade will assist in site assessment for 35 flow monitoring sites throughout the City's wastewater collection system; deploy, calibrate, and monitor 35 flow meters for a 9-day period; and prepare the data for analysis.  Recommendations will be submitted for permanent flow monitoring locations as may be required to identify ongoing infiltration and inflow into the City's collection system.   

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PROJECT: Hydraulic Modeling and Model Updates
LOCATION: Tempe, Arizona
SCHEDULE: 1998, 2001, 2005
PROJECT SCOPE:
Wade & Associates and Wilson & Company were retained by Malcolm-Pirnie to provide software and technical assistance in the development of a sanitary sewer hydraulic model for the City. The model was incorporated as part of a wastewater master plan and included the evaluation of current and future capacity needs within the service area. Pipedream©, was selected by the prime consultant because of its versatility, accuracy, and user-friendly application. The original hydraulic model was first developed in 1998 by Wade and Wilson with updates in 2001 and again in 2005. The intial Pipedream© model included 10,371 sewer lines in 40 modeling basins. The updated 2005 hydraulic model currently includes 11,603 sewer lines. In addition, seven new modeling basins were created.

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PROJECT: Hydraulic Modeling and Model Updates
LOCATION: Pima County, Arizona
SCHEDULE: 1994, 1995, 2002
PROJECT SCOPE:
Wade & Associates assisted in the initial development of a hydraulic model of 15.0 million feet of sanitary sewer system for Pima County, Arizona.  Scope of work included preliminary data collection and project coordination; basin review and modifications, flow monitoring and data analysis; development of a hydraulic network; hydrodynamic model calibration; and Pipedream© software license, transfer and training.

In 2002, Wade & Associates was retained by Brown and Caldwell to assist in the development of a comprehensive update to the hydraulic model. Services included an update of the current wastewater hydraulic model, future growth analysis, GIS integration, CMOM compliance assistance, and on-site Pipedream© software training and support.

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PROJECT: Flow Monitoring Program
LOCATION: Kingman, Arizona
SCHEDULE: 2002
PROJECT SCOPE:
Wade & Associates provided wastewater flow monitoring services to the City of Kingman as part of a comprehensive master plan developed by the City’s prime consultant, Burgess & Niple. The project included the installation, service, and analysis of wastewater flow from 6 key locations in the City’s sanitary sewer system.

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