Aliso Creek Sediment Discharge and Stream Mechanics


Stream stabilization and sedimentation study of Aliso Creek in Southern Orange County, California.






Lobecks Pass Flood Hazard, Hydrology and Sedimentation

  Hydrology, Hydraulic and Sedimentation Study in San Bernardino County, California.

Rivertech Inc. provided expert witness services to the San Bernardino office of Caltrans. The areas of expertise include hydrology, hydraulics and sediment transport. A large private gas and electric utility company alleged that Caltrans caused damage to their property in Lobecks Pass, located near Needles, California, and sued for compensation.

At issue was the construction of a levee system that Caltrans installed to protect Highway 95 from being washed away by flood flows in Lobecks Pass. Rivertech Inc. performed analysis in hydrology, hydraulics and sediment transport to demonstrate that the levee system did not cause flood damage to the utility pipeline that traverses the pass.

In addition to the several analyses, Rivertech Inc. provided court testimony and forensic analysis of historical records and photographs. The final ruling, in appellate court, was in favor of the defendant, Caltrans.

Desert Knolls Wash Hydraulics and Sedimentation Study

 Apple Valley, San Bernardino County, California

Rivertech Inc. conducted hydraulic, sediment transport and scour modeling analysis for 2-year, 5-year, 10-year, 100-year, and FIS FEMA flow rates for Desert Knolls Wash using HEC-RAS/HEC-6 programs. The modeling analysis was from the Wash confluence with Mojave River (downstream) to Tao Road (upstream), and identified the following: a) Existing conditions (hydraulic, sediment, scour) for flow rates as stated above. b) Post-project conditions (hydraulic, sediment, scour), for flow rates, as stated above, for each Alternative. Each HEC-RAS/HEC-6 run modeled a continuous Alternative which includes a Reach 1 design scenario, (including any modifications to the concrete channel) and Reaches 2 & 3 design scenarios. Reach 1 of Desert Knolls Wash includes the receiving area of the Mojave River to the upstream limits of the existing concrete channel. Reach 2 is from Apple Valley Road to upstream of Tuscola Road, and Reach 3, includes the Wash from upstream of Tuscola Road to downstream of Tao Road.


Atascadero Hydrology, Hydraulics and Floodplain Study

 Atascadero, San Luis Obispo County, California

The purpose of this study was to provide a floodplain delineation report to the California Department of Water Resources (CDWR) for a study reach along Atascadero Creek, within the City of Atascadero, San Luis Obispo County, California. This study was designed by the US Army Corps of Engineers LA District (Client) to provide technical data and floodplain mapping which was sufficient to meet the Federal Emergency Management Agency's (FEMA) technical guidelines. At the conclusion of the study, after review by the City of Atascadero and CDWR, the materials will be turned over to the city for their final disposition. Rivertech performed hydrologic and hydraulic analyses of the 10-square mile Atascadero Creek watershed and delineated the resulting 100-year floodplain.