Tenny Creek Emergency Repair

December 23, 2015

Otak responded to an emergency for long time client Clark Regional Wastewater District (CRWWD).
On Dec 8th, Clark County was inundated with a terrific rainstorm that caused flooding and damage. During the event a small landslide broke a sewer line pipe along Tenny Creek. On Dec. 9 Otak acted quickly to stabilize the situation and provided immediate support with survey crews, hydraulic analysis, stream design, slope stabilization design, restoration planting design. Design documents and permitting were completed by Dec. 15th and construction began on Dec. 16. Currently, the contractor has cleared the area, installed the temporary stream bypass, repaired the broken sewer line, and has begun excavation for the stabilization work. The project is expected to be complete before the end of the year.

Otak’s design of the repair involved the following items: 

  • Stabilizing and repairing the broken sewer line
  • Moving the creek laterally and reconstructing the slide area
  • Providing a streambed design that met fish passage requirements (gradients, streambed gravels and wood drop structures)
  • Providing a robust and stable streambed section that will resist the headcutting of the the stream
  • Restoring the area with upland plantings as it in a habitat buffer area.
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