Professional Project Defense: Ryan Weiss

Fluvial Geomorphic Response to In-Stream Structures: The Effects of Design, Planning and Restoration of the Comanche Creek Catchment, New Mexico, USA

Date: November 12, 2008
Time: 11:00 AM
Location: SAAP, RM. 327

College: School of Architecture and Planning and University College
Department: Community and Regional Planning and Water Resources

Abstract

Anthropogenic impacts to the Comanche Creek catchment of northern New Mexico have resulted in impaired water quality and aquatic habitat for Rio Grande cutthroat trout. Federal and state policies promulgating collaborative, multi-stakeholder watershed-based restoration endeavors have driven the implementation of in-stream, riparian and upland treatments in the catchment. This research addresses restoration endeavors through a review of stream channel and watershed planning, policy and restoration. Drawing upon case studies from current literature, policies driving watershed restoration and the use of in-stream structures to improve aquatic habitat and water quality were reviewed. A stream hydrograph was extrapolated utilizing streamflow evaluations from a hydrologically similar gaged catchment. Analysis of fluvial geomorphic trends was completed through field observations and channel geometry surveys of cross-section, longitudinal profile and substrate throughout reaches impacted by in-stream structures. Trends in fluvial form and processes at discrete locations indicate response to present flow and sediment regimes. Downstream trends in channel geometry suggest overall disequilibrium within the catchment. Data does not reveal whether goals and objectives of in-stream structures and overall catchment restoration endeavors have been achieved. Monitoring over multiple spatial and temporal scales and a post-project appraisal are recommended for objective determination of success or failure of restoration endeavors. Critical data analysis and reporting to funding agencies by both restoration practitioners and scientists is proposed for policy review and development at federal and state levels to further refine collaborative watershed-based restoration endeavors.