TC WID Demo_Site Visit PPT_18-June-2024.pdf

TUTTLE CREEK

RESERVOIR WATER

INJECTION DREDGING

DEMONSTRATION

Laura Totten (USACE) John Shelley, Ph.D., P.E. (USACE)

18 June 2024

Tuttle Creek Lake prior to filling.

“The views, opinions and findings contained in this report are those of the authors(s) and should not be construed as an official Department of the Army position, policy or decision, unless so designated by other official documentation.”

Figure: Husic 2023

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Please ask questions on ProjNet, as indicated in the solicitation.

Anything we say at this meeting is non-binding.

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• Project Overview

• Tuttle Creek Reservoir Multipurpose Pool Sedimentation

• Water Injection Dredging

• Tuttle Creek Reservoir Water Injection Dredging Demonstration

• Location

• Dredging Areas

• Access and Staging

• Debris

• CLINS

• Dredge Plans

AGENDA

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Authorization: Flood Control Act of 1938

Funding: Consolidated Appropriations Act FY22 and FY23 Operations and Maintenance – Water Supply (WS) and State of Kansas contributed funds

Collaborator: State of Kansas - Kansas Water Office

Project Manager: Laura Totten (USACE)

Technical Lead: Dr. John Shelley (USACE)

PROJECT OVERVIEW

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TUTTLE CREEK RESERVOIR

MULTIPURPOSE POOL SEDIMENTATION

• 49% full of sediment (multipurpose pool)

• 3,794 ac-ft / year (6.1 M CY / year) sedimentation

(multipurpose pool)

• On par with original projections

• Future without action: near total loss of multipurpose pool

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WATER INJECTION DREDGING

WID is an innovative type of dredging where the dredger injects a large volume of water at low pressure into the sediment layer to fluidize the layer and transport it to deeper water by gravity.

WID at the Port of North Carolina

• WID has been used in ports, harbors, and channels

• This project will be the first time WID is used in a lake

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TUTTLE CREEK RESERVOIR

WATER INJECTION DREDGING DEMONSTRATION

Test of the technology– not a “typical” dredging project

• Goal: Answer questions

• Not: Dredge to a certain elevation or volume

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The project is located at Tuttle Creek Lake, north-west of Manhattan, KS (Figure A.1)

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DREDGING AREAS

3.1.9 Dredging Area

The Water Injection Dredge (WID) will operate within 11 miles from the dam as shown in Appendix A. Most dredging will occur in the primary dredging area, within 4 miles from the dam. In this area both the submerged floodplain and submerged channel will be dredged.

The secondary dredging area consists of the submerged channel from 4 to 11 miles from the dam.

This area will be dredged in order to test the distance the turbidity current can travel.

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ACCESS AND STAGING

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ALTERNATIVE MOORING AREA

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Trees and other submerged debris may be present. Figure C.1 indicated the locations of timber stands, digitized from pre-impoundment aerial photography. Whether this timber was left in place prior to lake filling is not known.

USACE will provide a multibeam survey of the reservoir bottom prior to the start of dredging.

During dredging, the Contractor will collect multibeam and/or other data to ascertain and avoid submerged debris. Any delays due to submerged debris are not credible towards the active dredging hours. The shapefile digitized from the historic pre-impoundment aerial photography will be provided at Contract Award.

DEBRIS

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Type of Contract: Construction – Request for Proposal (RFP)

• CLIN 0001: WID Demonstration 2025 - Spring o Dredge design, construction and all other activities necessary to provide 100 hours of active dredging during Spring 2025. Includes all costs related to dredge assembly, mobilization, dredging operation for a five-day period in the Spring, and demobilization. Period of performance: Award through 31 May 2025.

• CLIN 0002 (Option): WID Demonstration 2025 - Summer o Dredge storage and all other activities to provide 100 hours of active dredging during Summer

2025. Includes all costs related to 5 additional total dredging days in Summer 2025. CLIN 0002 may be exercised without exercising CLINs 0003, 0004, & 0005. Option will be exercised at time of award or within 60 days ADC. Period of performance: 1 June through 31 August 2025.

• CLIN 0003 (option): WID Demonstration 2025 - Fall o Dredge storage and all other activities to provide 100 hours of active dredging during Fall 2025.

Includes all costs related to 5 additional total dredging days in Fall 2025. CLIN 0003 may only be exercised if CLIN 0002 is exercised. Option will be exercised at time of award or within 60 days ADC. Period of performance: 1 September through 20 December 2025.

CONTRACTING

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Type of Contract: Construction – Request for Proposal (RFP)

• CLIN 0004 (Option): Additional WID Demonstration Days 2025 o Additional 300 hours of active dredging (100 in Spring, 100 in Summer, 100 in Fall of 2025).

Includes all costs related to 15 additional total dredging days in 2025 (separated into the Spring, Summer, and Fall of 2025). The award of CLIN 0004 will be performed during the same period of performance as the base CLIN plus option CLINs 0002 and 0003 and will not extend the contract completion date. CLIN 0004 may only be exercised if CLINs 0002 & 0003 are exercised. Option will be exercised at time of award or within 90 days ADC. Period of performance: Award through 20 December 2025.

• CLIN 0005 (Option): WID Demonstration 2026 o Additional 600 hours of active dredging (200 in Spring, 200 in Summer, 200 in Fall of 2026).

Includes all costs related to mobilization, dredging operation for three ten-day periods (separated into Spring, Summer, and Fall of 2026), and demobilization. CLIN 0005 may only be exercised if CLINs 0002 and 0003 are exercised. Option will be exercised at time of award or no later than 30 June 2025. Period of performance: 21 December 2025 through 19 December 2026.

CONTRACTING (cont.)

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Other Specifications

• The Contractor shall supply, assemble, operate, and maintain the dredge and all supporting equipment to complete the dredging according to the RFP at Tuttle Creek Lake, KS.

• Contractor must construct any facilities needed for dredge assembly, maintenance, fueling and operations and any waiting periods in-between seasons. No dock or harbor facilities are available. Other locations may be available with prior Contracting Officer approval.

• USACE owns and operates a boat ramp and parking lot in Tuttle Cove (approximately 2.5 miles from the dam) which will be available to the Contractor. This site has access to the lake and is situated near the principle dredging area, as shown in Appendix B Figure 1. An existing rock ledge runs along the south side of Tuttle Cove which could provide a potential staging area from which to work with access to the water.

• Staging area is within the flood control pool.

CONTRACTING

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OPERATING DREDGING PLAN

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DREDGE PLAN (SPRING 2025)

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Please ask questions on ProjNet, as indicated in the solicitation.

Anything we say at this meeting is non-binding.

QUESTIONS