Many rivers and creek are severely limited in reaches due to low summertime flows. These low flows have several negative impacts; limited fish passage, increased temperatures, reduction of water available to riparian vegetation and increased impacts from surface water runoff.

CES has extensive experience in the design and installation of effective diversion structures with appropriate fish passage and screening. CES and its associates have designed and installed a variety of structures ranging from instream screened vortex tubes, (inverted weir) to log or rock weirs and to pump stations. CES designs systems that meet NMFS and USFWS criteria for irrigation screening and incorporate the appropriate level of convenience and ease of use for the operator.

Streambank Stabilization
Rapid changes in watersheds are often due to a combination of many factors. These include increased runoff and sediment loading related to land use changes, differing stream alignment due to construction or someone else's stream stabilization, damaged riparian buffer zones, manipulation within the channel or a combination of these factors.

Sound, effective stream restoration requires attention to engineering, biology and social concerns and issues. CES and its associates have designed and have overseen construction of over 10 miles of streambank restoration. These projects have involved restoration systems that use combinations of vegetation, wood and rock. These projects have been shown to withstand high-energy flows while providing shade, structure and other aquatic benefits.

Fish Passage Improvements
Irrigation diversions and road culverts often cause fish passage and screening problems. CES and its associates have been providing solutions to these problems for over 20 years. CES and its associates have extensive experience in design and installation of fish screening systems using pressure backwash, gang wipers, channel bottom flat plates or combinations of these. Our design and installation experience in fish passage systems include fish ladders such as Alaska Steeppass, Denil and pool and weir structures.

CES and its associates' projects have included diversion structures from 5 to 200 cfs capacity. These projects that have provided screening and passage meet all State and Federal regulatory requirements. In addition, CES has a strong working relationship with NMFS and the USFW.

Click here to see examples of CES' Water Resources projects...