Linden Ravine Drainage Improvements

Linden Ravine Drainage Improvements


Vermillion, SD

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Linden Ravine in Vermillion, known locally as Skunk Hollow, conveys a significant amount of storm water from the upstream drainage basin. Over time, the drainage way became overgrown with trees and shrubs and started to experience significant erosion: the eroded inslopes inched closer and closer to nearby structures. The City asked Banner to complete a hydraulic analysis and design the ravine to convey water by both underground storm pipe and overland through a drainage swale. The underground pipe was designed for a 5-year storm event, and the swale was designed to handle the 100-year event. To reduce further impact on the area, Banner specified HDPE storm pipe and PVC inlets rather than concrete, as the lighter materials could be carried to site by hand instead of multiple vehicle passes for concrete. The drainage way displays a significant elevation difference from upstream to downstream so multiple forms of erosion control were used to help establish the vegetation both in the drainage swale bottom and the inslopes. At times the construction limits were so narrow that the contractor used a buggy to haul bedding material from the street to the pipe installation location.

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Project Goal # 1

Provide underground conveyance for storm water from the upstream drainage basin

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Project Goal # 2

Stop erosion of the existing inslopes and channel bottom

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Project Goal #3

Provide a clear area for City forces to maintain the drainage route

Project Features

  • 728 LF of 15" and 18" Diameter HDPE Storm Sewer Pipe
  • 5 - 24" and 30" Diameter PVC Area Inlets
  • 3 - 48" Concrete Storm Manholes
  • 950 SY - Turf Reinforcement Mat
  • 1000 SY - Erosion Control Blanket
  • 0.5 Acres - Hydroseeding

Services Provided

  • Topographic Survey
  • Preliminary and Final Design
  • Hydraulic Analysis
  • Construction Contract Administration
  • Construction Staking

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