Graduation Date

Fall 2016

Document Type

Dissertation/Thesis

Program

Master of Science degree with a major in Environmental Systems, option Environmental Resources Engineering

First Committee Member Name

Brad Finney

First Committee Member Email

brad.finney@humboldt.edu

First Committee Member Affililation

HSU Faculty or Staff

Second Committee Member Name

Margaret Lang

Second Committee Member Email

margaret.lang@humboldt.edu

Second Committee Member Affililation

HSU Faculty or Staff

Third Committee Member Name

Eileen Cashman

Third Committee Member Email

eileen.cashman@humboldt.edu

Third Committee Member Affililation

HSU Faculty or Staff

Abstract

The Warm Springs National Fish Hatchery located in Warm Springs Oregon, is hampered with many issues that impact its effectiveness. In an effort to improve the effectiveness of the hatchery, United States Fish and Wildlife Services (USFWS) has expressed interest in modifying the existing intake to address a number of specific concerns. Five specific objectives have been identified to define the overall project scope. USFWS desires to provide a means to prevent frazil ice from forming on and around the hatchery intake screens, prevent sediment from collecting behind the weir and entering the hatchery intake, provide effective hatchery screening to prevent sediment, debris, and fish from entering the hatchery intake, decrease intake water temperatures during summer months, improve the intake screen cleaning system, and provide a means for effective water quality treatment to limit spikes in turbidity and therefore improving the effectiveness of the existing ultraviolet treatment.

Concept level improvements were developed to address the objectives. Site visits, interviews with hatchery staff, water quality sampling, hydrologic and hydraulic analysis were completed and record construction drawings of the hatchery were reviewed to confirm concept level improvement feasibility.

Three concept level design alternatives were developed to address the first four objectives while only preliminary water quality sampling was conducted so that separate concepts could be developed in the future to address the fifth objective, effectiveness of the existing sand filters. The concepts developed and evaluated included installation of rotary drum screens or vertical fixed plate screens to replace the existing static drum screens. In addition, the concepts included an a la carte of other options that address the objectives. Those a la carte items include; construction of a rock groin structure, weir improvements to provide an adjustable spillway, and miscellaneous utility upgrades.

From this analysis, Concept 3 - relocating the hatchery intake upstream was identified as most likely to address the objectives and is feasible given the site constraints. More analysis is needed before a recommendation can be made including collection of in-stream water temperature data and a quantification of the amount of sediment expected to accumulate near the proposed intake structure. However, it is also recommended that additional and consistent operation and maintenance at the existing intake could also provide significant improvements to address the objectives in the short term.

Citation Style

APA

Download

Share

 
COinS