Peter Yee Tony Eberhardt Dave Strelchuk Frank Quinn Bill Daley
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REPORT ON POTENTIAL MEASURES TO ALLEVIATE PROBLEMS CREATED BY CURRENT HIGH LAKE LEVELS TASK 4 NIAGARA RIVER TO INTERNATIONAL JOINT COMMISSION FROM TASK GROUP MEMBERS PETER YEE TONY EBERHARDT DAVE STRELCHUK FRANK QUINN BILL DALEY OCTOBER 1987 Niagara River, 1925. EXECUTIVE SUMMARY The Niagara River is the natural outlet of Lake Erie. It is also a bottleneck in the Great Lakes system with the problem compounded to some extent by placement of structures in the river. This study examines a number of potential short-term measures to increase the Niagara River flows in order to lower Lake Erie's water levels at times of extreme high water supplies. Construction of a Squaw Island diversion channel, equipped with a control gate, would increase the river's flow carrying capacity by about 10,000 cubic feet per record (cf s) . Similarly, a channel deepening in the vicinity of the Peace Bridge would also bring about the same capacity increase. A twoyear construction period would be required for either project. Maximum lowering impact' on Lake Erie due to either measure is about 0.4 foot. The operation of the existing butterfly valves and culverts at the Black Rock Lock would increase the Niagara River flow by about 1,300 cfs, which would correspond to a maximum lowering impact on Lake Erie of about 0.06 foot. The control structure in the Chippawa-Grass Island Pool can be operated to maintain a slightly lower level when compared with the present operating procedure. Computer modelling and field measurements indicate that about 3,000 cfs flow increase may be possible if the Pool water level is lowered one foot. The estimated lowering impact on Lake Erie is about 0.13 foot. Both sides of the upper Niagara River have been infilled repeatedly in the past. The construction of the Peace Bridge, International Railway Bridge, the old water intake, etc, have caused further restriction to the flows. Of all the major obstructions examined in this study, it appears that the removal of the old intake structure and part of the filled area at Fort Erie just downstream of the Peace Bridge would be most practical and effective. Breaching the Bird Island Pier to allow a 100-foot opening would also increase the flow by about 2500 cfs. but this could adversely affect naviga- tion in the Black Rock Canal. Removal of the other obstructions would further increase the capacity of the river. However, these are not considered viable due to high costs and the extended time frame required. REPORT ON POTENTIAL MEASURES TO ALLEVIATE PROBLEMS CREATED BY CURRENT HIGH LAKE LEVELS Inside Cover: Energy, Mines and Resources (Canada), National Air Photo Library, 1925, "Image of the Upper Niagara River," TABLE OF CONTENTS Page EXECUTIVE SUMMARY Section 1 INTRODUCTION 1 Authority Membership Purpose and Scope Section 2 EMERGENCY MEASURES Squaw Island Diversion Description of Diversion Operational Constraints Cost Estimates Construction Schedule Niagara River Excavation Description of Excavation Operational Constraints Cost Estimates Construction Schedule Construktion Constraints TABLE OF CONTENTS (cont.) Page Black Rock Lock Culverts and Valves Operation of the Control Structure of the Chippawa - Grass Island Pool Description of Operations Operational Constraints Hydraulic Analysis Removal/Modification of Obstructions Identification of Obstructions Evaluation of Impacts Section 3 HYDROLOGIC IMPACT ON LAKE ERIE LEVELS Squaw Island Diversion Niagara River Excavation Black Rock Lock Culverts and Valves Operation of the Control Structure of the Chippawa - Grass Island Pool Removal/Modification of Obstructions Section 4 ENVIRONMENTAL, SOCIAL, AND OTHER CONSIDERATIONS Squaw Island Diversion Niagara River Excavation Black Rock Lock Culverts and Valves Operation of the Control Structure of the Chippawa - Grass Island Pool Removal/Modification of Obstructions Regulatory Considerations Section 5 FINDINGS BIBLIOGRAPHY LIST OF TABLES Flow Increases for Squaw Island Diversion Structure Flow Increases for Niagara River Excavation Estimated Impacts on Lake Erie due to Removal/Modification of Obstructions Hydrologic Impacts of Squaw Island Diversion LIST OF FIGURES Black Rock Canal-Squaw Island Diversion Structure Black Rock Canal-Squaw Island Diversion Cross Sections of Diversion Channel Black Rock Canal-Squaw Island Diversion Centerline Profile of Control Structure Location of Niagara.River Excavation Cross Section of Niagara River Excavation Obstructions in the Niagara River iii Section I Introduction 1.1 Authority On 1 August 1986, the governments of Canada and the United States requested the International Joint Commission (IJC) to examine and report on the subject of the record high Great Lakes water levels. The IJC subsequently established the Great Lakes Water Levels Task Force to investigate a number of emergency measures which could be taken within one year or less to reduce extremely high water levels. Eight task groups were established to examine the various aspects. Task Group No. 4 - Niagara River was assigned the investigation of possible emergency measures that could be taken in the Niagara River to increase its flows. This report is a summary of the findings of.the group. The investigations which were initiated in January 1987 were to be cmpleted by September of that year. Funding was limited to in-house appropriations by the participating agencies. 1.2 Membership Membership of Task Group No. 4 - Niagara River consists of: United States Canada A. J. Eberhardt, Chairman P. P. Yee, Chairman U.S. Army Corps of Engineers, Environment Canada, Buffalo District, Buffalo, NY Burlington, Ontario F. He Quinn; PhD Dm L. Strelchuk Great Lakes Environmental Research Ontario Natural Resources Laboratory Toronto, Ontario NOAA, Ann Arbor, Michigan We Daley New York State Department of Environmental Conservation Albany, New York W. P. Erdle (thru April 1987) U.S. Army Corps ,'of Engineers, Buffalo District, Buffalo, NY 1.3 Purpose and Scope This report discusses several possible emergency measures which could be implemented in one year or less to increase Niagara River flows. It also outlines some preliminary cost estimates, time-frames for implementation, &d likely constraints, associated wlth these emergency measures. The ' evaluation of hydrologic impacts does not include the implementation of other possible emergency measures being examined by other task groups. Task Group No. 8 will car:yout systemic evaluations which will take into account the Niagara River measres along with other concurrent measures. The nature and scope of this report is limited by resources and due to the short time frame necessitated by the emergency nature of the situation. As such previous studies were used wherever possible, (see "Bibliography"). No socio-economic evaluation was carried out regarding the impacts of changing levels on Great Lakes interests due to these measures. Findings of the group are intended to serve as an indicator of the viability of the measures. Before any measure is to be implemented, a more extensive review as well as a more detailed design and plan of operation would be required. For a description of the Niagara River and the Great Lakes system, readers are referred to the recent IJC report on the subject of lake levels. Section 2 Emergency Measures 2.1 Squaw Island Diversion 2.1.1 Description of Diversion The structure considered is a slight modification of the Plan S2-75 structure studied in the Lake Erie Water Level Study, and is herein referred to in this report as the Modified S2-75 Control Structure. The structure would consist of 3 - 25' wide fixed-wheel roller gates. Plan and section views of the diversion channel and a detail of the gates are shown on Figures 1 through 3. The depth of concrete into bedrock and the overall structural dimensions have been updated compared to the original design in the Lake Erie Study. 2.1.2 Operational Constraints It is assumed that the operating schedule of the diversion structure to accommodate operation of the Black Rock Canal and Lock would be the same as that used in the Lake Erie Water Level Study for S-alternatives. The schedule was developed to permit usage of the lock and canal by boats and commercial vessels. The operating schedule results in the effective flow being 62.5% of the design flow. For the Modified S2-75 Structure, the design and effective flows increase with Lake Erie outflow as shown in Table 1. Table 1 - Flow Increases for Squaw Island Diversion Structure Lake Erie Increased Discharge (cfs) Outflow ( cf s) Design Effective- R : 200,000 . 15,400 9,620 248,000 18,500 11,560 2.1.3 Cost Estimates The construction cost of the Modified S2-75 Structure is $20.9 million based on October 1986 price levels. The-cost components are essentially the same as those incorporated in the Lake Erie Water Levels Study with the following exceptions: a. where applicable, an Engineering News Record (EM) index factor of 1.632 was applied to bring component values up from December 1977 to current price levels; b. the quantity of concrete required increased by 1,700 cubic yards due to the addition of piers between gates; c. the quantity of rock excavation required decreased by 4,500 cubic yards due to the smaller structure size and higher foundation elevation; d. current cost of 3 - fixed-wheel roller gates is slightly less than 1979 cost of single tainter gate; and e. "damage" factors have been eliminated (real estate values were retained and assumed to be the same). In the Lake Erie Study estimate, "damages due to the project were assessed to compensate the City of Buffalo for the additional costs that would be incurred to dispose of a volume of material equal to the disposal area volume lost during the remaining 10-year life of the affected area". The city no longer uses this land for disposal purposes. The estimate includes $2.7 million in indirect costs which consist of the cost of detailed design, field investigations including geotechnical and environmental evaluations, environmental impact statements, and miscellaneous actions related to project implementation.