07040-015 Saylor Creek Watershed Final Report

(2011) 07040-015 Saylor Creek Watershed Final Report. Agriculture and Land Stewardship

pdf
Preview
PDF
7040_015 Saylor Creek Sub-Watershed FINAL combined report.pdf

File Size:2MB

Abstract

Phase 2 of the Saylor Creek Improvement Project is focused on channel restoration. The existing stream channel is generally incised, running through areas primarily covered with heavy trees, brush and weeds. The ravine ranges from 6 to 20 feet deep through the corridor with very steep slopes in several areas. In two areas storm outlets are undercut or suspended above the channel. Tall undercut, eroded banks exist along several of the outside bends. Sediment deposition on the inside bends limits the cross-section of the channel, increasing flow velocity and forcing this faster flow toward the eroded outside bank. A wide array of practices will need to be implemented to address channel erosion. Improvements will be specifically tailored to address problems observed at each bend. The result will be a channel with a more natural appearance, and reduced use of hard armor and revetment. Some sections will require minimal grading with removal of underbrush for improved maintenance access and more sun exposure, better allowing deep­ rooted plants and flowers to establish to provide further erosion protection. Straight sections with steep banks will require grading to pull back slopes, increasing the creek's capacity to convey storm flows at slower velocities. Sections with sharp bends will require slope pull back and armor protection. A constructed wetland will collect and treat runoff from a small sub-watershed, before being discharged into the main tributary.

Item Type: Departmental Report
Keywords: Watershed Improvement Review Board, WIRB, water quality, watershed, City of Ankeny, Iowa, Middle Des Moines, Saylor Creek Sub-watershed
Subjects: Natural resources and environment > Water resources > Water quality
Natural resources and environment > Water resources > Watersheds
ID Code: 21299
Deposited By: Jerome Neppel
Deposited On: 29 Feb 2016 13:09
Last Modified: 29 Feb 2016 13:09
URI: http://publications.iowa.gov/id/eprint/21299