1. Backbone Engineering Clark Larsen, Kendrick Shepherd, and Brett Thomas

2. Background Information  Bartholomew Culinary Water Tank is located up Hobble Creek Canyon.  The current tank is a 1.4 million gallon steel tank.

3. Problem Statement  The current water tank was deemed structurally unsound.  A new tank needs to be designed.

4. Design Requirements  Determine optimal sizing for the tank. Based on the water users needs.  Determine new location of tank near the existing tank.  Design new tank to withstand avalanche and earthquake loads.

5. Overall Product

6. Geotechnical Design  Not completed due to snow cover  Neglect settlement and bearing capacity Uphill excavation approximately 25 feet Downhill excavation approximately 15 feet Preconsolidation pressure greater than overburden pressure  Neglect heaving due to French drain  Alluvial deposits Friction angle – 45° Unit weight – 125 pcf

7. Hydraulic Design  Overflow Structure Must allow more than the max inflow of (15,000 gpm) to flow out.  Piping Checked to ensure adequate head  Venting Must meet venting requirements according to API 2000.

8. Structural Design  Walls Used vertical and horizontal prestressing. 12 inch thick core wall and 2 inches of shotcrete covering.  Foundation 2 foot thick and 5 foot wide ring foundation. 7 inch thick base slab in the middle. Temperature and shrinkage reinforcement.

9. Structural Design  Domed roof Circumferential and radial reinforcing. Horizontal prestressing around the rim of the roof.  Seismic Designed according to ACI 350.3-01 and ACI 350.3R-01 Conservative estimates were made when necessary.

10. Construction/Cost  Transition Disrupt water flow as little as possible.  French drain  Difficult construction because of limited space.  3 – 3.75 million dollars

11. Conclusions  The avalanche load caused excessive reinforcing and concrete to be used.  Possible different site location.  Geotechnical analysis should be completed for more accurate results.

12. Questions?