Stream Restoration and
Upper Guadalupe River Flood Control
Project. For Moffatt & Nichol Engineers, Inc., 2002?2004. Hydroikos
is assisting Moffatt & Nichol in their design of this Corps?funded project.
This has included review of design drawings, evaluation of potential fish
passage problems, and evaluation of the feasibility of a "geomorphic approach"
to redesigning the project. Using an ecologically-desirable reach of the river
as a geomorphic template, Coats developed a conceptual geomorphic design for
the degraded reach 10B, of the river, and worked with the design team to bring
the design to the 65 percent completion level.
review of flood control alternatives. For the Santa Clara Valley Water
District, San Jose, CA, 2003-2004. The District has developed a detailed design
for a flood control bypass channel for the Guadalupe River. As part of a
3-person Independent Review Panel Coats is assisting the District in a review
of the flood control project from a geomorphic and ecological perspective.
Evaluation of historic water quality impacts at Sulphur Creek,
Napa Co. For the Gray Carey law firm, San Francisco, 2000. Historic
gravel mining and placement of concrete on the bed and banks of Sulphur Creek
were alleged to have damaged water quality and fish passage opportunities.
Hydroikos determined the line of "Ordinary High Water", and the liklihood of
effects of concrete on pH of the stream. For the concrete company, defendants
in the now-settled lawsuit, he is helped to design a stream crossing that is
more "fish friendly".
Creek Protection Permits and Creek
Assessment Reports. For various clients, 2002-present. Cities in the
Bay Area are increasingly adopting programs and permit requirements to protect
aquatic resources within city limits. Hydroikos has helped homeowners and lot
owners in Oakland and Orinda to navigate the permit process and to develop
plans that are consistent with the cities objective of protecting their
creeks. This has involved assessment of streamside vegetation and erosion
problems, and calculation of expected stream stage and discharge.
Permit Compliance at a Solano County Vineyard. For D. Sattui
Vineyard, 1999. In the process of installing a vineyard, the owner had put some
jurisdictional creeks (or gullies) into culverts. Hydroikos analyzed the extent
of the impacts, and proposed a solution that helped bring the site back into
compliance with the Water Board regulations.
Environmental Impact Reports (Cache Creek),Yolo County, California. For
Lilburn Corporation and the County of Yolo, 1996. Coats supervised a project to
provide hydrologic expertise to evaluate the impacts of three proposed
aggregate mining projects on Cache Creek. The project proposed off-channel
mining from both deep and shallow excavations, with reclamation to agriculture,
wetlands, and open ponds. The EIR considered project impacts from flooding,
potential "capture" of the terrace excavations by Cache Creek floods, changes
in rainfall infiltration, changes in direction and rate of round water flow,
evaporation from the reclaimed ponds, and potential surface and ground water
Pilarcitos Watershed Management
Plan. For the California Department of Fish and Game and Regional Water
Quality Control Board, 1995-96. Pilarcitos Creek in San Mateo County drains a
watershed of 30 mi2. The aquatic and riparian habitats have been damaged by
water diversions for municipal and agricultural uses, overgrazing, erosion and
sedimentation, clearing of riparian corridors, use of agricultural chemicals,
etc. Coats was Principal-in Charge of a project to develop a plan for spending
about $900,000 on enhancement and restoration in the watershed. The project
included outreach to the local farmers, and coordination with a Technical
Adobe Creek Restoration and Access
Plan. For the City of Los Altos, 1989. As part of a team of planners,
biologists and hydrologists, Coats helped to develop plans for riparian
restoration and trail alignment along a seven mile reach of Adobe Creek near
Castro Valley Creek Restoration Alternatives
Study. For the Alameda County Flood Control District, 1989. Coats
evaluated a series of channel design alternatives for flood control, bank
stabilization, and riparian corridor enhancement to restore a section of Castro
Valley Creek. The project team prepared design drawings and cost estimates for
construction of channel improvements, which included a series of redwood
log-cribwalls for streambank stabilization. This project has been constructed
and is used by the ACFCD as a demonstration for environmentally sensitive
Instream Flow Requirements for Zayante
Creek, Santa Cruz Co. For the State Water Resources Control Board,
1981-82. Through the John Muir Institute, Coats conducted studies to determine
the flow regime required for sediment transport to maintain or enhance
beneficial uses. Results were published in Environmental Management.