Ground water pore-pressure influences on stream restoration

J. A. Magner, O. Baird, K. J. Kuehner

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Ground water exchange with stream channel beds can produce unique restoration challenges. Ground water flow into alluvial substrate stream channels can weaken boundary shear strength of the channel bed. Bed instability limits the quality of aquatic habitat. Channel stability was evaluated on the lower reach of Seven Mile Creek, an 86-km2 trout stream in south-central Minnesota. Based on assessment a 330-m was restored in a county park using natural channel design techniques. Detailed geomorphic data was collected from the incised stream to flatten channel grade, create pools, and establish a meander bend point bar. A track-hoe was used to excavate bed and bank materials, and place large natural rock and root wades for channel and habitat restoration. For less than $50 per linear meter the restoration activities were generally successful for infrastructure protection based on post storm channel inspection. A before-and-after trout survey indicates that trout populations may have improved with increased percent of pools and enhanced riffle quality. Designed pool depths were not achievable because ground water pore-pressures collapsed pool side-walls when the depth exceeded more than 1.06-m or a side-wall angle greater than 11.4 degrees. Placement of footer rock below cross-vanes and "J"-hook rock vanes was limited to one boulder because sub-bed material collapsed into the excavation within seconds of track-hoe bucket removal. The consideration of ground water pore-pressure should be included in stream restoration designs that interact with ground water discharge zones.

Original languageEnglish (US)
Title of host publicationSelf-Sustaining Solutions for Streams, Westlands, and Watersheds - Proceedings of the 2004 Conference
EditorsJ.L. D'Ambrosio
Pages42-47
Number of pages6
StatePublished - Dec 1 2004
Event2004 Self-Sustaining Solutions for Streams, Westlands, and Watersheds Conference - St Paul, MN, United States
Duration: Sep 12 2004Sep 15 2004

Other

Other2004 Self-Sustaining Solutions for Streams, Westlands, and Watersheds Conference
CountryUnited States
CitySt Paul, MN
Period9/12/049/15/04

Keywords

  • Fish Habitat
  • Ground water
  • River Restoration

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  • Cite this

    Magner, J. A., Baird, O., & Kuehner, K. J. (2004). Ground water pore-pressure influences on stream restoration. In J. L. D'Ambrosio (Ed.), Self-Sustaining Solutions for Streams, Westlands, and Watersheds - Proceedings of the 2004 Conference (pp. 42-47)