Three alternative designs were chosen to model and choose from. Each design should address the issues found with the current design, above.
Only headwater elevation and downstream velocities calculated from CulvertMaster were used in the decision matrix. Control type and flow regime were recorded for design information only. Flow rate was used to determine if the culvert was undersized. An undersized culvert will not be able to convey the entire storm event, as seen in the corrected effective culvert.
- Water surface elevation meets 100 year water surface elevation, but this alternative had the highest water surface elevation
- This alternative had the second highest downstream velocity
- Water surface elevation meets 100 year water surface elevation, and this alternative had the lowest water surface elevation
- This alternative had the highest downstream velocity
- Water surface elevation meets 100 year water surface elevation, and this alternative had the second lowest water surface elevation
- This alternative had the lowest downstream velocity
This alternative is the least expensive.
This alternative is the second most expensive option
This alternative is the most expensive due to the cost of the wing walls.
All cost was estimated from the ADOT Historical Bid Tabulations in Arizona.
Red Rock Engineering made the following decision matrix to determine the final design. For more details and justification of scores please see the Final Report.
DOCUMENTS AND PHOTOS