| # | Code | Description | Unit | Qty | Rate (₹) | Amount (₹) |
|---|---|---|---|---|---|---|
| 1 | 2.8.1 | ExcavationEarth work in excavation by mechanical means (Hydraulic excavator) / manual means in foundation trenches or drains (not exceeding 1.5 m in width or 10 sqm on plan), including dressing of sides and ramming of bottoms, for all lift, including getting out the excavated soil and disposal of surplus excavated soil as directed, within a lead of 50 m. — All kinds of soil. | Cum | 16.20 | 260.30 | 4,216.86 |
| 2 | 4.1.8 | Pcc BeddingProviding and laying in position cement concrete of specified grade excluding the cost of centering and shuttering - All work up to plinth level : — 1:4:8 (1 Cement : 4 coarse sand (zone-III) derived from natural sources : 8 graded stone aggregate 40 mm nominal size derived from natural sources) | Cum | 3.69 | 6,812.00 | 25,136.28 |
| 3 | 19.35.3 | Pipe Np3 900Providing and laying Non Pressure NP-3 class (Medium duty) R.C.C. pipes including collars/spigot jointed with stiff mixture of cement mortar in the proportion of 1:2 (1 cement : 2 fine sand) including testing of joints etc. complete — 900 mm dia RCC pipes. | Metre | 8.00 | 5,377.25 | 43,018.00 |
| 4 | 6.1.2 | Headwall FoundBrick work with common burnt clay F.P.S. (non modular) bricks of class designation 7.5 in foundation and plinth in: — Cement mortar 1:6 (1 cement : 6 coarse sand) | Cum | 3.10 | 7,132.25 | 22,109.98 |
| 5 | 6.4.2 | Headwall AboveBrick work with common burnt clay F.P.S. (non modular) bricks of class designation 7.5 in superstructure above plinth level up to floor V level in all shapes and sizes in : — Cement mortar 1:6 (1 cement : 6 coarse sand) | Cum | 4.97 | 9,105.95 | 45,256.57 |
| 6 | 2.25 | BackfillFilling available excavated earth (excluding rock) in trenches, plinth, sides of foundations etc. in layers not exceeding 20cm in depth, consolidating each deposited layer by ramming and watering, lead up to 50 and for all lift. | Cum | 9.31 | 196.00 | 1,824.76 |
| 7 | 6.4.2 | Wing WallsBrick work with common burnt clay F.P.S. (non modular) bricks of class designation 7.5 in superstructure above plinth level up to floor V level in all shapes and sizes in : — Cement mortar 1:6 (1 cement : 6 coarse sand) | Cum | 3.23 | 9,105.95 | 29,412.22 |
| 8 | 7.1.1 | Downstream ApronRandom rubble masonry with hard stone in foundation and plinth including levelling up with cement concrete 1:6:12 (1 cement : 6 coarse sand : 12 graded stone aggregate 20 mm nominal size) upto plinth level with : — Cement mortar 1:6 (1 cement : 6 coarse sand) | Cum | 0.90 | 7,311.25 | 6,580.13 |
| Your inputsCulvert length 8 m · Pipe int. ⌀ 900 mm · Pipe class NP3 medium duty · Pipe-invert depth 1.2 m · Headwall ht 1.2 m · Wing wall length each 1.5 m · Downstream apron length 2 m | TOTAL | ₹1,77,555 | ||||
- NP3 medium duty (DSR 19.35) is appropriate for rural roads (PMGSY, panchayat, farm). NP4 heavy duty (DSR 19.36) is mandatory under NH/SH carriageway, district roads, urban arterials.
- Pipe diameter selection: rule-of-thumb is catchment area × design rainfall ÷ Manning hydraulic capacity. PMGSY default = 600 mm pipe in plain terrain, 900 mm in sloped/forested terrain. Always verify via hydrological assessment for design.
- PCC cradle bedding: 25% of pipe diameter bedding cradle (haunch fill) is added to the base 150 mm PCC bed. For NP4 + heavy loading, increase to 50% cradle and refer IRC SP 13 Cl. 5.3.
- Headwalls are full 1-brick (230 mm) F.P.S. brick masonry per CPWD standard. For NH/SH culverts, swap to RCC headwall (5.2.2) — more durable, takes wheel-impact load.
- Backfill rate 2.25 (filling excavated earth) is used; the available excavated earth is normally sufficient for re-fill since the pipe + PCC together occupy ~25% of trench volume.
- Excludes: wing walls (typically 45° splayed brick masonry, 1-2 m long each end, 4 nos total) — add separately under 6.4.2; apron/cushion concrete on inlet/outlet bed (IRC SP 13 Cl. 8.3); stone pitching on side slopes (DSR 7.X random rubble); guard stones at headwall ends; reflective markers + signage.
**Hume pipe culverts** are the single largest category of cross-drainage structure built in rural India — PMGSY road specifications mandate at least one culvert every 500-1000 m of road. The CPWD standard configuration is a single-line NP3 or NP4 class RCC pipe (per IS 458) laid on 150 mm PCC bedding with 25% pipe-diameter cradle fill, brick masonry headwalls at both ends, and excavated-earth backfill. Pipe diameter 450-1200 mm depending on catchment area + traffic class. This BOQ Builder generates the complete cost per CPWD DSR 2023 — excavation, PCC bedding, pipe, headwalls, backfill — for any diameter / class / length combination.
NP3 vs NP4 — when to use which
**NP3 medium-duty** (DSR 19.35) is rated for occasional vehicular loading up to IRC Class B + 1.2 m earth cover above pipe crown. Use for: PMGSY rural roads, village internal roads, panchayat roads, farm-access roads, residential colony storm drains. **NP4 heavy-duty** (DSR 19.36) is rated for IRC Class A + AA wheel loads and full 70R tracked-vehicle loading. Use for: NH / SH carriageway crossings, district roads, urban arterial roads, industrial corridors, any culvert under cover < 1 m. Cost difference: NP4 is roughly 12-20% more expensive than NP3 for the same diameter. Specifying NP4 unnecessarily on rural roads is a common over-design that inflates BOQ by ~10%.
Pipe diameter sizing — quick rules
**PMGSY default** for plain-terrain rural roads: 600 mm. **For high-rainfall + sloped catchment**: 900 mm. **For NH/SH crossings**: 1000-1200 mm depending on hydrology. Detailed sizing uses the **Manning rational method**: Q = (1/n) × A × R^(2/3) × S^(1/2). For NP3 pipe with n=0.013 and 2% gradient: 600 mm pipe carries ~1.1 m³/s; 900 mm carries ~3.1 m³/s; 1200 mm carries ~6.8 m³/s. Compare against design discharge Q = C × i × A (Rational formula) using a 25-year-return design rainfall. Always upsize one nominal step for safety + future road widening.
What's included and excluded
**Included**: trench excavation, 150 mm PCC bed + 25% diameter cradle, pipe (single line), brick masonry headwalls at both ends (full external width), earth backfill. **Excluded**: wing walls (45° splayed, 4 nos × ~1-2 m × ₹15,000-25,000 each — quote separately under 6.4.2); apron concrete on inlet/outlet (IRC SP 13 Cl. 8 specs); stone pitching on slopes (DSR 7.X); curtain wall / cut-off wall at scour-prone inlets; weep holes through headwall (~₹150 each); guard-rail / parapet (only required if depth-to-invert > 1.5 m); reflective markers at headwall corners. The minimum honest culvert quote on PMGSY is ~25-40% more than this Builder shows because of the excluded items — factor that into your tender estimate.