Icicle Workgroup Presentation Eight-Mile Lake Appraisal Study - PowerPoint PPT Presentation

Sep 07, 2023 •188 likes •304 views

Icicle Workgroup Presentation Eight-Mile Lake Appraisal Study December 6, 2013 Mike Kaputa Dan Haller, PE Dave Rice, PE OCR Grant Overview Eight-Mile Lake Restoration / Expansion Appraisal Study: Build on TU reconnaissance / site

Icicle Workgroup Presentation Eight-Mile Lake Appraisal Study December 6, 2013 Mike Kaputa Dan Haller, PE Dave Rice, PE
OCR Grant Overview Eight-Mile Lake Restoration / Expansion Appraisal Study:  Build on TU reconnaissance / site investigation  Evaluate structural, operational, permitting, future use, and costs for four lake levels:  1,827 acre-feet  2,000 acre-feet  2,500 acre-feet  5,000 acre-feet Icicle Creek Water Resources Strategy Workgroup #7
Icicle Creek Water Resources Strategy Workgroup #7
Eight-Mile Lake Structural / Operational Overview  Masonry Rock/Concrete Wall and Earthen Embankment Dam  Earthen Embankment has Eroded at Masonry Rock/Concrete Wall  Masonry Rock/Concrete Wall is Partially Deteriorated  Spillway  Was Historically Controlled by Flash Boards at Opening in Masonry Rock / Concrete Wall  No Longer Controlled by Flash Boards, Debris in Spillway  Primary Spillway Well Appears to be Connected to Discharge Pipeline Icicle Creek Water Resources Strategy Workgroup #7
Eight-Mile Lake Structural / Operational Overview  Overflow Spillway Channel  Filled with Large Rock, Boulders  Cutoff Walls Downstream of Dam  Outlet Gate (Controls Flow to Discharge Pipeline)  Original Operator Damaged, Removed  Currently Operated by Inserting Come Along into Steel Piece Attached to Stem  Rock Above, Against Gate  Difficult to Operate and Fully Close Icicle Creek Water Resources Strategy Workgroup #7
Eight-Mile Lake Structural / Operational Overview  Discharge Pipeline  ~36” Corrugated Metal Pipe (CMP)  Submerged at Outlet, Rocks and Boulders  Unable to inspect submerged Inlet  Rough Measurements  ~10 Feet from Top of Wall to Spillway Inlet Crest  ~5 Feet from Spillway Inlet Crest to Water Surface  Outlet Pipe Invert ~8 to 9 Feet Below Water Surface Icicle Creek Water Resources Strategy Workgroup #7
Icicle Creek Water Resources Strategy Workgroup #7
Icicle Creek Water Resources Strategy Workgroup #7
Icicle Creek Water Resources Strategy Workgroup #7
Permitting Investigation Current focus is data gathering:  District files / institutional knowledge  Ecology files (water rights, dam safety, topic, adjudication files)  Chelan County Auditor (parcel ownership) and Superior Court (adjudication files)  DNR files  USFS files  BLM files Icicle Creek Water Resources Strategy Workgroup #7
Next Steps  Develop restoration / expansion approach  Conceptual design and cost estimates  Documentation of existing permit authority  Identification of required permit authority for each option  Documentation of benefits / beneficial uses  Operational changes  Appraisal Report Icicle Creek Water Resources Strategy Workgroup #7

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