Embedded Files
Survey Work
Survey Work
As of 12/16, the Terrific Trout team has entered the analysis and design stage of our project. This semester, we completed two trips to our project site. On the first trip, we familiarized ourselves with the site and observed the problems posed by the existing stream crossing, a low water ford. We also collected some preliminary hydraulic geometry data, completing two cross-section and long-profile surveys with a laser level. This survey data, shown below, allowed us to deepen our understanding of the section of river and the natural state we would like to restore it to.
Our second visit to the site we completed a 3D survey of the existing road crossing, surrounding area, and a stretch of river we plan to use as a "reference reach" for our design. The data from this surveying session was input into Civil3D where it is being turned from a point cloud into distinct surfaces that can be used to compute construction requirements and flood flows. A sample of the preliminary survey data is shown below.
Proposed Structure Idea
Proposed Structure Idea
In addition to field work, our team completed extensive literature review this semester, familiarizing ourselves with specifications, requirements, and best practices for stream restoration and crossings. This background reading helped us to narrow down potential solutions for our site. After thorough analysis of 4 potential solutions, we decided on proceeding with a bottomless culvert. The bottomless culvert allows for vehicles to pass over a stream while providing aquatic organism minimally obstructed habitat and passage beneath the culvert. Moving forward, we will be using the traditional bottomless culvert profile, shown below, and applying it to our section of river utilizing Civil3D. Once designed in Civil3D, we were able to perform hydraulic analysis in HEC-RAS and ensure our structure will be able to handle flows under any conditions.
Hydrologic Analysis
Hydrologic Analysis
Used USGS gages (in image to the left) related to our own location to generate graphs to determine our design flows for the area.
Stream Stats was used to help with gage analysis
Flood potential portal shows how we do not have to worry about climate change for our stream specifically
Final values are shown below
Streambed Analysis
Streambed Analysis
During the survey day, a pebble count was taken to determine the streambed particle size distribution, seen below. It was taken at both the ford design reach location and our model stream segment, the reference reach.
AutoCAD Civil 3D Drawings
AutoCAD Civil 3D Drawings
Using AutoCAD Civil3D and the survey data collected, we created an existing condition surface and a proposed design surface, seen below. The final cross section and measurements are also included below. The sizing is based on different designs provided by Contech as well as U.S. Forest Service Standards.
HEC-RAS Modeling
HEC-RAS Modeling
With flows determined from hydrologic analysis, we modeled potential culvert structures in HEC-RAS. Multiple cross sections were created and a design cross section is shown below.
3D Print Design
3D Print Design
Using the exiting and proposed Civil3D surfaces, we were able to create a 3D printed design to help present our information.
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