Hyporheic Process Restoration: Design and Performance of an Engineered Streambed

By Paul D. Bakke, Michael Hrachovec, and Katherine D. Lynch

Stream restoration designed specifically to enhance hyporheic processes has seldom been contemplated. To gain experience with hyporheic restoration, an engineered streambed was built using a gravel mixture formulated to mimic natural streambed composition, filling an over-excavated channel to a minimum depth of 90 cm. Specially designed plunge-pool structures, built with subsurface gravel extending down to […]

Integrating Large Wood Jams into Hydraulic Models: Evaluating a Porous Plate Modeling Method

By Roby Ventres-Pake, Matt Nahorniak, Natalie Kramer, Jennifer O’Neal, and Tim Abbe

Large wood (LW) jams are key riverine habitat features that affect hydraulic processes and aquatic habitat. The hydraulic influence of LW jams is poorly understood due to the complexity of fluid dynamics around irregular, porous structures. Here we validated a method for two-dimensional hydraulic modeling of porous LW jams using the open-source modeling software Delft3D-FLOW. […]

The Physical and Biological Effects of Engineered Logjams (ELJs) in the Elwha River, Washington

By Michael McHenry, George Pess, Tim Abbe, Holly Coe, Jennifer Goldsmith, Martin Liermann, Randall McCoy, Sarah Morley, Roger Peters

This report summarizes the results of monitoring efforts on Elwha River Engineered Logjams (ELJs) for the period from 1999-2006. During this period, a total of 21 ELJs have been constructed in the Elwha River by the Lower Elwha Klallam Tribe. Since constructed (2000-2004), ELJs have proved to be stable with little significant change in position […]

Can Wood Placement in Degraded Channel Networks Result in Large-scale Water Retention?

By Dr. Tim Abbe, Dr. Susan Dickerson-Lange, Mike Kane, Pete Cruickshank, Mike Kaputa, and John Soden

In forested channel networks wood can be the dominant control on grade and shear stress partitioning. In these systems a loss of wood triggers channel incision that results in a lowering of alluvial groundwater tables and loss of water storage within a watershed. It also speeds up the routing of water out of channel network. […]

Engineered Log Jams: Recent Developments in Their Design and Placement, with examples from the Pacific Northwest, U.S.A.

By Dr. Tim Abbe, Mike 'Rocky' Hrachovec, and Steve Winter

Wood has been well-established as a material constituent of fluvial systems capable of altering channel morphology and fluvial processes. The published literature partially reflects humanity’s relationship with wood. It was widely acknowledged that in-stream wood, even in large rivers, was a serious threat to navigation and capable of influencing fluvial systems. In his treatise on […]

Chico Creek Watershed Assessment for the Identification of Protection and Restoration Actions

By Dr. Tim Abbe, Shawn Higgins, Greg Blair, and Torrey Luiting

The purpose of this assessment is to develop a plan that identifies protection and restoration strategies that prioritize specific actions to maintain and/or improve salmonid habitat conditions and ecological resilience in the Chico Creek watershed. For more information contact: Tim Abbe, PhD, PEG, PHG at Natural Systems Design — Email: Tim@naturaldes.com | Phone: (206) 834-8697

Flood Erosion Hazard Mitigation Evaluation, Upper Sandy River, Clackamas County, Oregon

By Dr. Tim Abbe, Mary Ann Reinhart, Shawn Higgins, David French, Jay Wilson

This report describes the current erosion and flood hazards, the factors influencing these hazards, and a restorative flood and erosion protection strategy for the Upper Sandy River valley. For more information contact: Tim Abbe, PhD, PEG, PHG at Natural Systems Design — Email: Tim@naturaldes.com | Phone: (206) 834-8697

Freshwater | Rivers Gone Wild — Mountain River Response to a Warming Climate in the Pacific Northwest

By Dr. Tim Abbe, Scott Beason, Paul Kennard and Jim Park

This publication focuses on the reality that rivers move. It illustrates how climate change disrupts the rivers balance by violently accelerating changes in river architecture. For more information contact: Tim Abbe, PhD, PEG, PHG at Natural Systems Design — Email: Tim@naturaldes.com | Phone: (206) 834-8697

Self Mitigating Protection for Pipeline Crossings in Degraded Streams: A Case Study from Woodward Creek, Washington

By Tim Abbe, PhD, PEG, PHG, Charley Miller, PE, and Michael Aubele

This case study from Woodward Creek, WA, provides insight into self mitigation protection for pipeline crossings in degraded streams. It outlines a unique approach which recognizes the processes threatening infrastructure and emulates natural structures to provide the necessary protection. For more information contact: Dr. Tim Abbe, PhD, PEG, PHG at Natural Systems Design — Email: Tim@naturaldes.com | Phone: […]

A Framework for Delineating Channel Migration Zones

By Cygnia F. Rapp and Dr. Tim Abbe

This publication offers a thorough and systematic procedure for identifying and delineating Channel Migration Zones (CMZ). For more information contact: Tim Abbe, PhD, PEG, PHG at Natural Systems Design — Email: Tim@naturaldes.com | Phone: (206) 834-8697

Geomorphic, Engineering, and Ecological Considerations When Using Wood in River Restoration

By Dr. Tim Abbe and Andrew Brooks

This chapter, part of the publication “Stream Restoration in Dynamic Fluvial Systems”, provides an overview of wood in rivers, focusing on wood stability in rivers and design considerations for the reintroduction of wood to larger alluvial channels. For more information contact: Tim Abbe, PhD, PEG, PHG at Natural Systems Design — Email: Tim@naturaldes.com | Phone: […]

Floodplain visualization using LiDAR derived relative elevation models

Created by Daniel Coe of  the Washington State Department of Natural Resources, Division of Geology and Earth Resources (www.dnr.wa.gov/geology), these maps provide a 3-D view of river processes in their geological setting. http://www.dnr.wa.gov/programs-and-services/geology/publications-and-data/presentation-archive  

Sandy River Floodplain Handbook

As part of a larger flood hazard mitigation study for Clackamas County Emergency Management Department and the Sandy River Basin Council (SRBWC), Natural Systems Design was hired to develop a pilot floodplain restoration project in the Upper Sandy River watershed. A component of this project produced this handbook to educate the community about risks associated […]

Large Wood National Manual, Developing a National Manual for Planning, Designing, and Implementing Large Wood Projects

Design of engineered logjams (ELJs) and placement of large wood (LW) have become key to river restoration strategies nationwide. NSD team members, Leif Embertson, Mike Hrachovec and Tim Abbe were primary authors of this manual to train and educate restoration practitioners on the planning, design, placement and maintenance of large wood with an emphasis of […]

A Methodology for Delineating Planning Level Channel Migration Zones

by Patricia L Olson and Nicholas T. Legg; Tim B Abbe and Mary Ann Reinhart, and Judith K. Radloff

The Washington Department of Ecology developed a planning-level CMZ delineation (pCMZ) method to support local communities’ updates and implementation of the SMA requirements. This document describes the pCMZ approach in context of Washington State regulations.