Last Chance Diversion Dam


Design of the RCC dam included stability calculations for sliding and uplift. The RCC dam was capped with conventional concrete and the downstream face was formed to have steps; design of stilling basin which included design of concrete apron, concrete training walls, concrete baffles, and concrete end sill. The stilling basin was designed using the guidelines presented by the U.S. Bureau of Reclamation (USBR) and a 3-D model of the stilling basin was made to ensure that hydraulics were acceptable.

The scope of the project included the following items:

Preparation of bid documents and specifications;
Bid opening and preparation of contract documents;
Removal of existing Timber Crib Dam which was about 180 feet wide and 16 feet tall;
•   Removal of existing concrete diversion structure;
•   Design of new concrete diversion structure with a capacity of 1,000 cfs that included two large radial gates and a small slide gate for required return flows; 
•  Design of a 26 feet tall 80 feet wide concrete head wall, also designing concrete training walls, concrete canal walls, and other concrete structures all in accordance with ACI 350; and 
  Design of 180 feet wide and 24 feet tall Roller-Compacted Concrete (RCC) Dam with a vertical upstream face and a 1:1 downstream sloped face.

FCE performed construction observation of all major work including removal of existing structures, construction of all concrete structures, and RCC placement which involved 24-hour shifts; review of submittals and pay requests; coordination with the Federal Energy Regulatory Committee (FERC), PacifiCorp, the USBR, the State of Idaho, the Contractor, and the Client. The project was completed over a very tight schedule through winter and early spring during, at times, harsh weather conditions and water was delivered to irrigators on time.


Gila River Investigations - Emery Pipeline Project

FCE investigated water supplies and delivery methods for the terms of the Indian Water Rights Settlement of the Gila River in Gila Valley, Arizona. Preliminary analyses were performed of the water supply data and water quality data for the valley. A summary of problems and needs was prepared with an approach for meeting the objectives of the study. Conceptual delivery methods in both quantity and quality were performed.

Design work included gathering historical water quality data, preparing right-of-way documents for easements, obtaining permits for agency crossings, design of the pipeline alignments, hydraulic modeling to size the pipeline and inlet/outlet structures, compiling cost estimates, and preparing construction drawings and design specifications.

The Emery Pipeline Project was identified to improve water availability in the Gila Valley. Completed work on Phase A consisted of a water delivery system including an inlet structure, 6,000 linear feet of 36-inch HDPE pipe, 8,400 linear feet of 30-inch HDPE pipe, outlet structure, collection system pipes from wells, and measuring equipment. Work has involved project investigations; pipeline drawings, technical specifications, cost estimates, and construction review; and SCADA system design and installation. Phase A completed in 2014.

KID Sanitary Sewer Lines CM


Franson Civil Engineers assisted Kearns Improvement District with the construction of two sanitary sewer lines. The project consisted of the construction of 3,800 feet of 24-inch sanitary sewer line and 3,800 feet of 8-inch sewer line within existing streets. Franson Civil staff also assisted with the preparation of specifications and bid documents. FCE assisted with construction management and construction observation during construction efforts.

Weber River Diversion Structure

FCE was retained by the South Weber Irrigation Company to assist in the rehabilitation of an aging diversion on the Weber River. Professional engineering services include: pipeline design, fish screen design, fish passage facilities, and NEPA compliance. Diversion and intake designs from both sides of Weber River was also performed.

The project was funded by a compilation of irrigation companies, Weber Basin Water Conservancy District, Trout Unlimited, State of Utah, and Reclamation under the Water for America initiative.

FCE prepared design drawings and specifications, which included hydraulic and concrete design of a rehabilitated diversion dam structure, two separate fish screen structures, a fish bypass channel to allow sensitive species to travel upstream, and pipelines to connect to existing pipe systems.

Construction review services were performed. During construction many obstacles had to be overcome due to extremely rare weather events and extreme high spring run-off flows in 2011.

Gunnison City Sewer System

FCE began consulting with Gunnison City in 2002 regarding odor problems emanating from the sewer system south of the Central Utah Correctional Facility (CUCF). FCE assisted Gunnison City and its attorney in meetings with CUCF to discuss the process of obtaining funding for improvements and upgrades to the city's sewer system. A cost sharing analysis between the City and CUCF for the improvements was conducted. Alternatives for restricting flow in the sewer pipe were also analyzed.

Over the subsequent few years, FCE worked with Gunnison City on the planning, design, and construction of the sewer system upgrade. FCE assisted the City in attaining $900,000 of cost share funding from CUCF for sewer collection system expansion from the correctional facility to the city's sewer lagoons. The project included design of a new pipeline to take water from CUCF to 300 West 500 South. Design drawings and specifications were produced. FCE assisted the City through Bid & Award and provided daily construction observation. Through weekly progress meetings and good communication with the contractor, issues with utilities and neighbors were handled effectively.

In 2006, as a follow-up to the sewer system upgrade, FCE assisted the City in conducting air quality tests to address the reoccurrence of odor issues in the sewer lines.