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Lepper Brook Dam

Lepper Brook Dam, Town of Truro

Lepper Brook Dam provides potable water for the Town of Truro and flows into Salmon River, directly through the town.

The dam is an embankment dam, approximately twenty five (25) metes high and is equipped with a 7.5m long concrete ogee spillway for flood water discharge.

Meco’s responsibilities include the preparation of Hydrology & Hydraulic Assessments, OM&S Manuals and EPP. Develop drawing, tender documents and specifications for downstream filter, monitoring weir and to grout old intake pipe with the dam. Coordinate with a diving team to access and survey the old intake structure which is 25m underwater.

Modify and install a pressure plug to prevent the discharge of the reservoir downstream if the old cast iron intake pipe were to be damaged from heavy equipment and construction.  Design a monitoring weir to measure the flow through the dam that would notify the Town of any abnormal readings.

Used sophisticated software FLDWAV© to produce a flood inundation map and complete the EPP manual.  Efficiently communicate and coordinate with subcontractors to complete the job.

Flood Study & Inudation Mapping

Flood Study & Inundation Mapping, Snare Hydro System, NWT

The Snare Hydro System is located about 144 kilometres north-northwest of Yellowknife, NT on the Lower Snare River.

The system is comprised of a cascade of four (4) hydroelectric power generation facilities; Snare Rapids, Snare Falls, Snare Cascades and Snare Forks, each with a powerhouse and several water control structures including main dam, freeboard dykes, spillway, and intake.

The Lower Snare River stretches 145 kilometres from Big Spruce to Slave Lake from a moderate slope terrain to flat Lakeland.  The only community in the reach is Behchoko, located on Marian Lake.

Meco’s responsibilities included a potential failure modes analysis (PFMA) to define the likely failure modes, models of the failure scenarios to measure the incremental impact on the environment and residents, as well as major infrastructure, and an assessment of the consequences.

Using the results of the analysis, Meco prepared inundation maps for the reach, identifying archeological and cultural sensitive areas, life safety issues and quantified the potential economic losses.

In areas of life safety, the scale of the mapping was reduced so as to better delineate the high risk areas.  Meco also assigned a consequence classification to each dam and established the design criteria for flooding.