City of greencastle flood protection plan
Download
1 / 27

City of Greencastle Flood Protection Plan - PowerPoint PPT Presentation


  • 78 Views
  • Uploaded on

City of Greencastle Flood Protection Plan. Presented by, United Geotech, LTD. Introduction. Team Overview Project Overview Design Requirements Project Approach Final Design Questions. Team Overview. Sarah Bireley– Project Manager Amee Wicks – Project Engineer

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' City of Greencastle Flood Protection Plan' - bern


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
City of greencastle flood protection plan

City of GreencastleFlood Protection Plan

Presented by,

United Geotech, LTD


Introduction
Introduction

  • Team Overview

  • Project Overview

  • Design Requirements

  • Project Approach

  • Final Design

  • Questions


Team overview
Team Overview

  • Sarah Bireley– Project Manager

  • Amee Wicks – Project Engineer

  • Brad Pickering – Project Engineer

  • Troy Cunat – Project Engineer


Project overview
Project Overview

  • Greencastle Water Treatment Plant

    • Located in Greencastle, Indiana south of Big Walnut Creek

    • Six wells provide 4,000 gpm peak

    • Serves population of 10,000

  • Site subject to flooding

    • Located in the flood plain

    • Rains on Labor Day flooded site


Project overview cont
Project Overview (cont.)

Big Walnut Creek

Well field

Lagoon

Filter Facility

US-231


Project overview cont1
Project Overview (cont.)

Taken September 16, 2003

Taken September 2, 2003


Design requirements
Design Requirements

  • Confirm finished floor elevation of filter facility

  • Confirm base flood elevation

  • Investigate flood protection options

  • Investigate security options

  • Deliverables

    • Proposal

    • Progress report

    • Final report


Project approach
Project Approach

  • Site assessment

  • Codes and regulations

  • Research design options

    • Flood protection

    • Security

  • Choose final design

  • Complete final design


Site assessment
Site Assessment

  • Topographic map

    • Finished floor elevation = 688.54 feet (MSL)

Big Walnut Creek

Lagoon

Filter Facility


Site assessment cont
Site Assessment (cont.)

  • Watershed area obtained

    • 216 mi2

  • Determined base flood elevation

    • Obtained Big Walnut Creek topographic map

    • 100-year flow determined

      • Q = 21,400 cfs

    • Maximum flows used in HEC-RAS to determine base flood elevation

      • 690.0 feet (MSL)



Site assessment cont2
Site Assessment (cont.)

Finished floor elevation

Low head dam


Codes and regulations
Codes and Regulations

  • Cannot raise base flood elevation more than 0.15 feet

  • Water tower must be enclosed in fence

  • Maximum levee side slope of 1:2.5

  • No levee construction restrictions


Design options
Design Options

  • Flood control options

Levee under construction

Floodwall under construction


Design options cont
Design Options (cont.)

  • Flood control options (cont.)

Dry floodproofing

Elevated structure


Design options cont1
Design Options (cont.)

  • Decision based on four criteria

    • Initial cost

    • Lifespan

    • Maintenance

    • Constructability


Levee design
Levee Design

  • Obtained soil borings & performed tests

B6

B5

B3

B2

B4

B1

  • Clay (CH), silt (MH), and sand (SW) present

    • Suitable for levee


Levee design cont
Levee Design (cont.)

Lagoon Expansion

Filter Facility


Levee design cont1
Levee Design (cont.)

  • Levee cross sections


Seepage analysis
Seepage Analysis

  • Used SefDam to calculate seepage

Elev. 692’

Elev. 690’

13’

  • Total seepage is 0.0244 ft3/day



Slope stability cont
Slope Stability (cont.)

  • XSTABL utilized to analyze slope stability

  • Eroding slope improved by Greencastle

    • Additional load from levee analyzed

      • Additional load does not cause failure


Security
Security

  • Fencing, lighting, and cameras investigated

  • Lighting and cameras may be added in future


Security cont
Security (cont.)

Filter Facility


Cost

  • R.S. Means Manual used to estimate costs

  • Levee

    • $71,500

  • Security

    • $24,000

  • Total cost

    • $95,500


Conclusion
Conclusion

  • Flood levels warrant need for flood protection

  • Levee chosen as protection option

    • Seepage and slope stability not a problem

  • Fencing with barbed wire chosen for security

    • Cameras and lighting may be added

  • Total cost of $95,500

    • Levee - $71,500

    • Security - $24,000



ad