- 2082 Bhadra · 5 marks
Project estimate for water supply project
Short answer
Estimate all components from design, apply District Rates and DUDBC norms, and add contingency 5%, supervision 3% and VAT 13%. For an illustrative small gravity scheme serving 1,000 people, the total project cost is NPR 18,842,976, about NPR 18,843 per person.
Prepare a project estimate for water supply project.
The estimate of a water supply project is prepared by finding the quantities of all works from the design, applying rates, and adding the other charges.
Steps
- Data: population (design year, 20 years ahead), demand (about 45–135 lpcd depending on the scheme), source discharge, topographic survey, pipe-network design and drawings.
- Components to be estimated: intake and source protection; transmission main; sedimentation/filtration and chlorination; reservoir tank; distribution network; valve and break-pressure chambers; tap stands or house connections; land and compensation; survey, design and supervision.
- Quantities of excavation, pipe, masonry, concrete, backfilling and fittings are measured from the drawings.
- Rates from District Rates and DUDBC norms, with lead and lift for pipes and materials.
- Abstract of cost with contingency 5%, supervision, VAT 13% (and price escalation if the period is long).
Illustrative estimate for a small gravity scheme
Assumptions: 25 public taps for about 1,000 people, quantities and rates are illustrative.
| S.N. | Item | Qty | Unit | Rate (NPR) | Amount (NPR) |
|---|---|---|---|---|---|
| 1 | Survey, design and investigation (lump) | 1 | LS | 250,000 | 250,000 |
| 2 | Intake structure with spring box (lump) | 1 | LS | 450,000 | 450,000 |
| 3 | Excavation in trench for pipelines | 3,200 | m³ | 600 | 1,920,000 |
| 4 | 110 mm HDPE pipe PN10, laid (transmission) | 2,500 | m | 1,800 | 4,500,000 |
| 5 | 63 mm HDPE pipe PN10, laid (distribution) | 4,000 | m | 950 | 3,800,000 |
| 6 | Backfilling | 2,900 | m³ | 300 | 870,000 |
| 7 | 50 m³ RCC reservoir tank (lump) | 1 | LS | 1,800,000 | 1,800,000 |
| 8 | Valve chambers, air valves, wash-outs | 15 | no | 25,000 | 375,000 |
| 9 | Public tap stands | 25 | no | 35,000 | 875,000 |
| 10 | Chlorination and sedimentation unit (lump) | 1 | LS | 600,000 | 600,000 |
| Sub-total | 15,440,000 | ||||
| Physical contingency 5% | 772,000 | ||||
| Supervision and administration 3% | 463,200 | ||||
| VAT 13% | 2,167,776 | ||||
| Total project cost | 18,842,976 |
Total estimated cost = NPR 18,842,976 (about NPR 18,843 per person).
✓ Answer checked by Claude Opus 5.5 (high effort)
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