|      |   

Go To Search
I Want To...
Click to Home

Project Updates 2014
Inner Basin Pipeline (2011 - 2012)

IN Pipeline Reconstruction ProjectOctober 25, 2012: This project has been completed! Click on the logo at the left or the booklet link below for more information on the history of the Inner Basin pipeline, Inner Basin water supply, Schultz Fire specifics, the reconstruction and relocation project, how the Cinder Lake Landfill was involved in post-fire flood mitigation, the geology and hydrology of the Inner Basin, and before and after photographs and specific site details.
 

Inner Basin Pipeline Reconstruction & Realignment Project Booklet
(This 40-page document may take a minute to download. 10K Megabytes.)


The Schultz fire of June 20, 2010, burned 15,075 acres of overgrown forest and, more importantly, completely destroyed a 1-3 foot layer of forest duff that had exceptional water absorbing qualities. The first major and subsequent monsoon storms during the summer of 2010 created severe runoff and powerful erosion effects on the mountainside, damaging the Inner Basin pipeline in a number of locations. The pipeline was severed in two sections and damaged to some degree along a six mile run of the pipeline from the Inner Basin to Weatherford Canyon. Hunter Contracting Co., Jacobs Engineering, Shephard-Wesnitzer, Inc., and City Staff worked closely with the USDA Forest Service, Federal Emergency Management Agency and Arizona Division of Emergency Management to repair the pipeline and to assure an expeditious completion of the project. Because of the high altitudes and rugged terrain the construction season is short. All of the agencies involved have expressed support for preserving the Inner Basin water source as a potable water supply and getting the work done in one season if at all possible. It‘s crucial that the Inner Basin pipeline be repaired as it’s the City of Flagstaff’s first and still the most economical water source. It costs $6,000 a day in the summer months to get water from other sources, such as wells, to make up for the lost Inner Basin supply source. It also provides 15 - 20% of the daily demand during peak summertime use.

Annual Water and Sewer Line Replacement Program (Ongoing)
In 2011 the City of Flagstaff Water implemented a water and sewer main replacement and rehabilitation program. The City of Flagstaff’s Water Main Replacement Program is designed to replace and rehabilitate aged and deteriorating water mains throughout the city. Many of the pipes in the system were installed in the early 1900s and are small in comparison to modern standards in water mains. The small size and age of the pipes, coupled with corrosion and sediment accumulation over the years, has affected the flow rate and quality of water in our community.

The program consists of annual projects that replace or rehabilitate pipe that has exceeded the useful service life, improve available fire flows, and remove corrosion by-products from the inside of the pipe improving water quality and reducing the potential for creation of biofilms and bacteriological activity that can impair the quality of potable water. The objective is to replace pipe when the condition warrants replacement, or to clean and line unlined cast iron pipe provided the pipe is in sound condition. Also, when the pipe is replaced, the replacement of appurtenances, such as valves, fire hydrants and house service lines in public space are included in this project. 

The locations where  water main and sewer main replacement work is to be performed are determined based upon an evaluation using water main break data, maintenance repair information provided by operations staff, GIS data (diameter, install date, material, etc.); hydraulic model results; and existing street pavement condition assessments. The evaluation criteria helps accurately prioritize candidates for main replacement within the City in an effort to avoid multiple pavement cuts. The City's goal is to replace 2.5 miles of water main and 1 mile of sewer main each year.

Replacing water and sewer mains is necessary business. If your house was built prior to 1950, chances are we will come to your neighborhood.


Presidio Water Tank (2011 - 2012)

This project will complete the installation of a new 1 million gallon (MG) welded steel potable drinking water tank reservoir, associated piping and appurtenances located at the existing Railroad Springs tank site. A contractor, BEC Southwest, has been selected to construct the tank. The construction schedule for this project is slated to begin March 1, 2012, and will run through August 30, 2102. If you would like more information, please go to the Presidio Water Tank Reservoir Tank link.

Utilities Integrated Master Plan (2011 - 2012)
The purpose of the overall master plan is to provide the City’s Utilities Division guidance for long-term planning, quantify the needs of water resources and determine the necessary water, wastewater and reclaimed water infrastructure needed over time. The objective of the master plan is to collect, analyze and provide information in one location in order to provide the most cost effective, reliable service to the City’s utility customers. The master plan will be broken into five chapters with the first discussing water resources and water production, identification of long-term water needs and providing recommended options and their respective costs for consideration. Only the first chapter is completed in draft form. Chapters Two through Four are planned to describe the existing water, wastewater and reclaimed infrastructure systems, develop performance criteria based upon hydraulic modeling and, lastly, to project the necessary infrastructure needed over time and at build-out (i.e., pipelines and treatment capacity). Chapter Five is planned to consist of a comprehensive set of formal water policies adopted by the City Council. View the Executive Summary draft of the report. View a draft of the full report. You can also see a presentation of the Utilities Integrated Master Plan. (This presentation may take a minute to download.)

Water Resources Sustainability Study (2011)
Economic vitality and community sustainability starts with a reliable, long-term water supply. The purpose of this study is to provide the City of Flagstaff and its decision makers an evaluation of its water supplies and their long-term sustainability and reliability for citizens here today and future generations. More simply put, the purpose of the study is to determine “what is Flagstaff’s bucket of water that it can objectively rely upon over the next 100-years?”

The criteria used to evaluate the sustainability and reliability of Flagstaff’s surface water, groundwater and reclaimed water supplies will be two fold. First, this study will attempt to identify what is the “sustainable yield” of groundwater pumping within the City’s well fields. The second criteria will be to evaluate the city’s water supplies against those criteria identified in the Arizona Department of Water Resources (ADWR) Adequate Water Supply program including its proposed revisions and Hydrologic Guidelines.

In order to better understand and predict the reliability of local groundwater supplies, a major aspect of this study will be to construct a numerical groundwater flow computer model of the Coconino Plateau aquifers in and around the City of Flagstaff. This tool will be based upon the U.S. Geological Survey’s regional northern Arizona groundwater flow model and will be used to determine the physical availability of groundwater in and around Flagstaff over the next 100-years. The results of this study should help the City and its decision makers to develop and implement sound water management programs and policies. View the Water Resources Sustainability Study and see a study area map.

Red Gap Ranch Pipeline (2008 – 2011)
The City hired JACOBS Engineering to conduct a feasibility study to analyze a variety of information associated with a possible pipeline from the City’s Red Gap Ranch located 40 miles east of the City. The study will define the most optimum pipeline alignment, conceptual design of the pipeline and associated facilities, right-of-way, federal, state & tribal environmental laws and estimated costs associated with the construction, operation and maintenance of the pipeline. Phase 1 of the three phase project is complete and Phase 2 is currently underway.

History
The City of Flagstaff purchased Red Gap Ranch in 2005, through a voter-approved bond process. Red Gap Ranch, located approximately 40 miles east of Flagstaff, lies above underground aquifers which can substantially increase the water supply available to Flagstaff. In addition to accommodating future water needs, Red Gap Ranch will diversify the sources of the existing water supply.

Pipeline Schedule
The City of Flagstaff is currently in Phase I of a Feasibility Study to determine the most constructable pipeline alignment. The results of the Feasibility Study will determine how to proceed with the Pipeline project. The next steps in the process are Phases II and III of the Feasibility Study, both of which involve more detailed study of a Recommended Alignment. See the Feasibility Study Schedule.

Feasibility Study Overview
The Red Gap Ranch Pipeline Feasibility Study seeks to identify the best pipeline alignment for further study. The Feasibility Study has identified four goals : Lowest Cost, Least Community Impact, Least Environmental Impact, and Least Project Risk. The final recommendation of the Feasibility Study will serve as a guide for achieving these goals in design and construction phases. View the most recent project information. (Meeting Takehome 1_8_09.PDF)

Public Involvement
In order to best understand public sentiment regarding possible issues associated with the Recommended Alignment. The Red Gap Ranch Pipeline Feasibility Study project team is accepting all public comment for consideration.

Please take the opportunity to click the link below and email the project team your questions, comments, and concerns. All submissions will be included in the Public Record of the project. To leave a comment regarding the project.

Project Documents

The following links contain useful project information: