- 2082 Baisakh · 4 marks
Why estimate before execution (water supply)
Short answer
For a municipal water supply project, estimating is essential to secure council approval and budget allocation, choose the most economical scheme, provide a reference for tendering, plan procurement of pipes and materials, schedule labour and equipment, determine user tariffs, and control costs during execution.
Why is estimating done before execution of a project? Explain in the context of a water supply project to be undertaken by a local municipal authority.
An estimate is prepared before execution because no project can be approved, financed, tendered or managed without knowing its probable cost, quantities and time. For a municipal water supply project it matters for the following reasons.
- Approval and budget: the municipal council must approve the programme and allocate funds (from its own revenue, provincial or federal grants, or a loan). The estimate gives the figure for the annual programme and budget.
- Feasibility and choice of option: the estimate for the source, intake, transmission main, reservoir and distribution network allows comparing gravity versus pumping, or pipe materials (HDPE, GI, DI), and selecting the economical one.
- Tendering: the engineer's estimate is the reference for tender evaluation under the Public Procurement Act, 2063. Bids much below or above it are examined.
- Quantities of materials: pipes, fittings, valves, cement, steel and so on can be listed and procured in time, since pipes often have long delivery times.
- Manpower, equipment and time: trenching, pipe laying and tank construction need planned labour and machines and a realistic schedule.
- Cost sharing and tariff: the user committee's contribution and the water tariff are fixed from the capital cost.
- Cost control: after award, progress payments and variations are checked against the estimate.
✓ Answer checked by Claude Opus 5.5 (high effort)
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