- Project Background
- Project Tasks
- Project Management
- Design Alternative and Decision Matrix
- Photo Gallery & References
Project BackGround
The goal of this project is to improve the Low-Water Crossing at the intersection of Fanning Wash and Soliere Avenue next to the I-40 in east Flagstaff, AZ. Soliere Avenue provides the connection from the residential area made up of multiple apartment complexes and neighborhoods to businesses such as grocery stores, banks, and more. The low water crossing at this intersection poses a public safety risk for vehicles, bicycles, and pedestrians. Existing conditions at the crossing allow stormwater runoff from upstream flow into Fanning Wash through the box culverts beneath the I-40E and I-40W and floods across the highly trafficked Soliere road.
To mitigate all flooding a culvert design is to be considered to allow the runoff to flow under the road and into the basin on the other side. Extensive research of hydrology in the area, geotechnical properties of the site, and hydraulic calculations of the culvert will be performed to create a design that can withhold peak flooding at the 100-year flood interval on the site and safely transport water to the other side of the road.
Project Location
Project Location in relation to Flagstaff
Project Location on Soliere Ave
Project Constraints
The scope of this project is limited by the knowledge of the team members due to the project requiring knowledge of classes team members are either enrolled in or will take next semester. In person meetings and site visitations have also been limited to the pandemic caused by COVID-19.
Scope of Services
See the link below for all tasks and subtasks that have been completed over the scope of this project
Scope of ServicesProject Gantt Chart
In the Project Gantt Chart below is the overall schedule with dates and durations of all tasks. The critical path is denoted by the redline in the flow path on the right.
Project Gantt ChartProject Staffing
In the Staffing link below an estimated amount of work hours for each of the four positions was estimated based on each task and its duration to be compiled into a table.
Project Staffing HoursCost of Engineering Services
In the Cost of Services link below the estimated cost of the project has been broken down by rates, personnel and equipment. Additonally, the Cost of Construction is also provided.
Cost of Engineering ServicesDesign Alternatives
Based on common culvert types found in Flagstaff four different culverts were analyzed to be potentially used to convey the 50yr storm interval required by the City of Flagstaff (COF) code. As depicted in the table below pipes made of corrugated metal and concrete, arches and box culverts were purposed for the final design. These potential solutions were modeled in HEC-RAS and CulvertMaster to determine which one best meets all the requirements specified by the COF. The main requirements called for the flow to be subcritical, unpressurized, under inlet control and have a minimum pipe diameter of 18in.
While each of the models were designed to meet this criteria, the Outlet Velocity, Constructablity and Cost of each design was considered to determine the best potential solution. As depicted below, each of the critera were weighted with Outlet Velocity being the greatest to try and mitigate issues with high energy water coming out into the Rio de Flag. The other two were given half that weight due to having equal importance. By rating each of the designs 1 through 3 for each category weighted scores were found and summed together to find the design having the greatest score which is highlighted in green.
Existing Channel Conditions
I40E Box Culvert Exit
Existing Culvert Entrance
Existing Culvert Outlet
Rio de Flag Wash
Paved Pullout between Soliere Rd & Rio de Flag