Whitewater River/CRA Siphon Erosion Protection

The Whitewater River project included demolition of an existing concrete roadway, removal of rip-rap lined earthen berms, and the design-build of a River Diversion Plan which included construction of earthen channel and berms to divert an active river away from the project site.

Project highlights

  • Constructed and reinforced a concrete access road and cutoff wall
  • Batched and poured 4,700 CY of light weight cellular concrete to protect an existing 13-foot diameter water supply line
Challenge

Extreme caution was mandated in order to protect this critical piece of infrastructure as we excavated and operated heavy equipment adjacent to the existing pipeline.

Challenge
Solution
Solution

RockForce constructed a drop structure consisting of 2,335 gabion baskets and mattresses filled rock, which RockForce derived by selectively grading, hauling, crushing, and screening to achieve the specified gradation and engineering properties. The project further involved the placement of shotcrete over the exposed gabion structure as further protection from water erosion. The Drop Structure was cut and filled on a 2:1 slope at 15-feet below existing grade. Construction of two each 10,000 CY earthen berms consisting of 4” minus screened material using native soil. We placed 1,490 Gabion mattress boxes below grade and up the water side slope of each berm, which created a key that was lined with 1-ton rip-rap and sand fill. The berms were constructed with a final grade of slope at a 2:1 slope. Each berm was constructed with a 12-inch thick crushed aggregate based access road. Dewatering of ground water was required and conducted. Onsite screening and quality control of all processed soil and rock materials. Materials and quantities include - 1-ton Class rip-rap per Caltrans, 19,000 tons, 12” minus soil, 24,850 tons, 4” – 6” gabion rock, 13,500 tons, 4” minus, 5,100 tons, and 3” minus, 2,300 tons.

Outcome

The Whitewater Project received recognition and was nominated by the MWD as its most impressive engineering project for 2018.

Outcome

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