IS 1200 (Part 1) : 2000Methods of measurement of building and civil engineering works, Part 1: Earthwork

IS 1200 (Part 1) specifies the methods of measurement of building and civil engineering works — earthwork. The IS 1200 multi-part series is the foundational reference for measuring quantities of construction work for billing, BOQ preparation, and project cost estimation in India. Part 1 specifically covers earthwork (cut, fill, excavation, embankment).

Use IS 1200 Part 1 for: - BOQ preparation for any earthwork-heavy project (highways, dams, building basements) - Bill verification + measurement at site - Contract claim resolution (extra work, variation orders) - Tender quantity reconciliation - Standard measurement protocol for quantity surveyors

IS 1200 has multiple Parts covering different work categories: - Part 1: Earthwork (this code) - Part 2: Concrete work - Part 3: Brickwork - Part 4: Stone work - Part 5: Form-work - Part 6: Refractory work - Part 7: Hardware - Part 8: Plastering and pointing - Part 9: Roof covering - Part 10: Ceiling and lining - Part 11: Paving, floor finishing, dado, skirting - Part 12: Plumbing - Part 13: White washing, colour washing, distempering, painting of buildings - Part 14: Painting of metal works - Part 15: Painting of woodwork - Part 16-29: more specialised measurements

For public works contracts (PWD, NHAI, MoRTH, MES, Railways), the IS 1200 series is the agreed measurement standard — disputes over quantities are resolved by reference to Part X of IS 1200.

General principles: - Volume by Cross-section method: average area × length of work - For long works (highway, canal): cross-sections at 100 m or per change of ground - For local works (foundation pit): direct dimension measurement - Volume in m³ (commonly cubic metre) or m² × depth

Categories of earthwork measured: - Excavation in earth (loose, ordinary, dense, hard) - Excavation in soft rock / hard rock (separate rates) - Filling (return fill from cut, borrow fill, embankment) - Spreading + dressing of excavated material - Compaction (separate item OR included in fill — per contract) - Disposal of surplus (lead distance + lift) - Dewatering (separate item if specified)

Classification of soil for excavation: - Loose / ordinary soil: sandy / gravelly soil, easy to dig with shovel - Hard / dense soil / murrum: requires pickaxe + spade - Soft rock: weathered / loose rock; can be dug with crowbar / chisel - Hard rock requiring blasting: rock that needs explosives - Hard rock not requiring blasting: rock that can be removed by chiselling, wedging

Different rates per soil class (per State SOR / contract).

Lead + lift: - Lead: horizontal distance of disposal from excavation; usually paid in 30 m / 50 m / 100 m increments - Lift: vertical distance for raising material above natural ground; paid per metre or per stage - Standard rates assume lead = 30-50 m; extra lead paid separately

Initial vs final levels: - Pre-work survey: original ground level (OGL) - Post-work survey: finished ground level (FGL) - Volume = (OGL − FGL) × area for cut; reverse for fill

Earthwork measurement units:

| Item | Unit | |---|---| | Excavation in soil | m³ | | Excavation in rock | m³ | | Filling (compacted) | m³ | | Dressing of surfaces | m² | | Lead | m³ × 30 m unit (extra over 50 m) | | Lift | m³ × m vertical | | Disposal | m³ | | Dewatering | per HP × hour OR lump-sum |

Earthwork shrinkage / swell factors: - Soft / loose soil: 10-15 % shrinkage from loose to compacted (i.e., 1.15 m³ loose = 1 m³ compacted) - Cohesive (clay) soil: 15-25 % shrinkage - Rock fill: 10-20 % swell from in-situ to broken (1 m³ rock in-place = 1.15-1.25 m³ broken)

Typical bid rates (for reference, varies by region + year): - Excavation in ordinary soil: ₹150-300 per m³ - Excavation in hard rock (blasting): ₹500-1500 per m³ - Embankment fill (selected granular): ₹250-450 per m³ - Lead 50-100 m (extra): ₹50-100 per m³ - Compaction at 95-98 % MDD: ₹50-150 per m³

For highway / NHAI contracts: - MoRTH Specifications for Road and Bridge Works (5th Revision) Section 300 — earthwork specifications align with IS 1200 Part 1 for measurement - State PWD SOR — uses IS 1200 measurement methodology

Cross-section spacing: - Highway: 100 m (less in cuttings / fillings) - Canal: 50 m - Railway: 100 m - Building footprint: per pit dimensions (for rectangular)

Sample measurement record:

| Chainage | OGL (m) | FGL (m) | Cut depth (m) | Cross-section area | Length (m) | Volume (m³) | |---|---|---|---|---|---|---| | 0+000 | 102.50 | 100.00 | 2.50 | A1 = 25 m² | — | — | | 0+100 | 103.00 | 100.50 | 2.50 | A2 = 30 m² | 100 | (A1+A2)/2 × 100 = 2750 m³ | | ... | ... | ... | ... | ... | ... | ... |

Pit / footing measurement: - Length × width × depth (rectangular) - For battered sides: average between top + bottom dimensions × depth - Round columns: π × r² × depth

• IS 1200 Part 2-29 — measurement methods for other work categories (concrete, brickwork, plaster, etc.).
• IRC:36:2010 — earth embankment construction (defines earthwork practice).
• IS 2720 series — soil testing methods.
• IS 2720 Part 7 / 8 — Proctor compaction.
• IS 1080:1985 — design of shallow foundations.
• IS 4081 — code of safety for blasting in mines and quarries.
• IS 1129 — recommendation for dressing of natural building stones.
• Indian Railways General Conditions of Contract (GCC) — use IS 1200 Part 1 for earthwork measurement.
• MoRTH Specifications for Road and Bridge Works (5th Revision).
• NHAI Standard Bid Document — measurement per IS 1200.
• State PWD SOR (Schedule of Rates) — built on IS 1200 measurement methodology.
• CPWD Schedule of Rates — uses IS 1200 measurement.
• Indian Standard Practice for Quantity Surveying (separate practice document).

1. Disagreement on soil class at site. Soil classification (loose/hard/rock) is contractor-vs-client subjective; rates differ 3-5×. Document with photo + supervisor sign-off at each soil change. 2. Lead distance over-claimed. Contractor claims long leads; client disputes. Mark spoil dump area on alignment plan; measure actual hauled distance. 3. No before-and-after surveys. Quantities computed from drawings, not actual ground; client / contractor each stake claims. Demand pre-work + post-work survey. 4. Measurement of compacted vs loose volume confused. Contractor measures loose (more); pays compacted (less). Apply shrinkage factor per soil class. 5. Disposal vs spread. Spreading on site (no disposal cost) vs disposal off-site (with lead) — confused; client disputes. Document. 6. Dewatering costs not measured separately. Contractor includes in unit rate; client argues separate. Specify in BOQ as separate item if known to be needed. 7. Rock excavation classification. 'Hard rock requiring blasting' vs 'hard rock not requiring blasting' has 30-50 % rate difference. Geological survey before excavation; document type. 8. Cross-section spacing too coarse. 200 m spacing on undulating terrain misses pockets of cut/fill; quantity wrong by 20 %. Use 100 m spacing in variable terrain. 9. No deduction for backfill within excavation. Foundation pit excavated 100 m³, backfilled 50 m³ around foundation; net 50 m³ surplus. Specify net measurement. 10. Borrow material + return fill not differentiated. Different rates apply (borrow includes haul; return fill from cut is cheaper). Specify. 11. No standard for 'extra over' rates. Lead beyond standard, vibration compaction, soil stabilisation — each needs explicit rate. Schedule of unit rates required. 12. Dispute resolution clause vague. When measurement disputed, who decides? Reference IS 1200 Part 1 + arbitration clause.

Quantity surveying cascade:

1. BOQ preparation: - Designer + QS works through drawings + specifications - Quantities per IS 1200 Part 1 (earthwork) + Parts 2+ (other) - Unit rates per State SOR / project market rates - Total project cost estimate 2. Tender + award — contractor bids on quantities × rates. 3. Site execution: - Pre-work survey for OGL - Daily / weekly progress measurement (contractor + client representative joint check) - Volumes computed from cross-sections (highway / canal) OR direct (building pit) - Soil classification recorded with photo + sign-off 4. Bill submission + verification: - Contractor submits monthly bill: quantity × rate - Client QS verifies measurement against IS 1200 Part 1 - Variations from BOQ noted (extra work / less work) 5. Variation orders — for changes from original scope; rates per BOQ or new rate negotiation. 6. Final bill — total work done × agreed rates. 7. Defect-liability period — final bill held back; released after DLP.

Typical earthwork project elements: - Highway: 60-80 % of total contract value can be earthwork (especially in hilly / cut sections) - Canal / dam: 50-70 % earthwork - Building basement: 5-15 % of contract value - Foundation: 2-5 % of contract value

Given earthwork's share of contract value, accurate measurement per IS 1200 Part 1 directly affects project economics. Disputes over earthwork quantities are the #1 source of construction litigation in India.