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3. Two alternatives are being considered to supply water from a reservoir to a local community. Option A is a tunnel and Option B is on open channel (steel flume with concrete-lined canal) Alternative Construction cost Annual O&M Economic Life (years) Salvage A-Tunnel $8,000,000 $55,000 100 $0 $120,000 50 B-Open Channel Steel Flume Canal Canal Lining $0 $900,000 $1,000,000 $550,000 100 $0 20 $25,000 a. Draw the cash-flow diagrams. b. Assuming an interest rate of 6%, determine the present worth of each alternative. c. Which is the best alternative from an economic perspective