| # | 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 | 63.00 | 260.30 | 16,398.90 |
| 2 | 4.1.8 | Pcc BedProviding 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 | 5.25 | 6,812.00 | 35,763.00 |
| 3 | 5.1.2 | Rcc RaftProviding and laying in position specified grade of reinforced cement concrete, excluding the cost of centering, shuttering, finishing and reinforcement - All work up to plinth level : — 1:1.5:3 (1 cement : 1.5 coarse sand (zone-III) derived from natural sources : 3 graded stone aggregate 20 mm nominal size derived from natural sources) | Cum | 6.75 | 9,045.75 | 61,058.81 |
| 4 | 5.2.2 | Rcc WallsReinforced cement concrete work in walls (any thickness), including attached pilasters, buttresses, plinth and string courses, fillets, columns, pillars, piers, abutments, posts and struts etc. above plinth level up to floor five level, excluding cost of centering, shuttering, finishing and reinforcement : — 1:1.5:3 (1 cement : 1.5 coarse sand(zone-III) derived from natural sources : 3 graded stone aggregate 20 mm nominal size derived from natural sources) | Cum | 11.25 | 10,852.95 | 1,22,095.69 |
| 5 | 5.9.1 | Shutter RaftCentering and shuttering including strutting, propping etc. and removal of form for — Foundations, footings, bases of columns, etc. for mass concrete | Sqm | 45.00 | 392.15 | 17,646.75 |
| 6 | 5.9.2 | Shutter WallsCentering and shuttering including strutting, propping etc. and removal of form for — Walls (any thickness) including attached pilasters, butteresses, plinth and string courses etc. | Sqm | 150.00 | 842.50 | 1,26,375.00 |
| 7 | 5.22.6 | SteelSteel reinforcement for R.C.C. work including straightening, cutting, bending, placing in position and binding all complete upto plinth level. — Thermo-Mechanically Treated bars of grade Fe-500D or more. | Kg | 1,530.00 | 107.85 | 1,65,010.50 |
| 8 | 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 | 3.00 | 196.00 | 588.00 |
| Your inputsDrain length 50 m · int. width 600 mm · int. depth 600 mm · Wall thk 150 mm · Raft thk 150 mm · Drain top depth 0.2 m | TOTAL | ₹5,44,937 | ||||
- RCC grade defaults to M20 (1:1.5:3 nominal mix per DSR 5.1.2 / 5.2.2 / 5.3). For drains > 1.2 m internal width or under vehicle access, bump to M25 (DSR 4.20.1.4) — but for storm-water drains M20 is universal.
- Steel quantity uses 85 kg/m³ — typical for light-medium duty drains. For drains under heavy-vehicle access (truck-loading on cover slab), revise to 100-120 kg/m³ manually.
- Cover slab (5.3) thickness fixed at 150 mm — adequate for pedestrian + occasional light vehicle. For regular vehicular loading (gully gratings + car/SUV), increase to 200-250 mm + steel to 110 kg/m³.
- Backfill uses excavated earth — 2.25 rate. If excavation is in rock, backfill is from imported earth — swap for 2.25(a) at higher rate.
- Excludes: gully grating + frame (cast iron 24x24 ~₹3,500 each), inlet/inspection chambers at intervals, manhole covers, expansion joints (every 30 m linear), benching / step-irons inside drain.
RCC storm drains are the backbone of urban + rural drainage in India. PMGSY's road-network rules mandate side-drains alongside every rural road; AMRUT 2.0's stormwater component co-funds urban drain networks; every panchayat does sullage + storm drains. The CPWD-standard configuration is a **U-section RCC drain** — M20 reinforced concrete raft and walls, optionally covered with an RCC top slab for pedestrian footpaths or vehicular crossings. This BOQ Builder generates the complete cost per CPWD DSR 2023 — earthwork, PCC bed, RCC components, centering, steel, backfill — for any combination of length, internal width (300–1500 mm), depth, wall thickness and open/covered configuration.
Open vs covered RCC drain — which to use
**Open drain** (no top slab) is the default for rural side-drains, garden / society storm drains, and any drain that's accessible for desilting. Costs ~30% less than covered. **Covered drain** (with RCC top slab + grating openings) is used along urban footpaths, vehicle accesses, parking lots, and anywhere pedestrian traffic crosses the drain line. The top slab is 150-200 mm thick RCC with M20 grade for footpath; bump to M25 + 250 mm for regular vehicle access. Always provide **manhole / inspection openings at 20-30 m intervals** on covered drains for desilting — these are quoted separately (≈ ₹4,500 each for a 600×600 mm CI cover with frame). For carriageway crossings, use a box culvert instead — the slab in a covered drain is not designed for IRC Class A/AA wheel loads.
How quantities are computed (IS 1200 Part 2 + Part 5)
RCC quantities follow IS 1200 Part 2 for concrete (net volume, no deduction for reinforcement displacement below 1%) and Part 5 for steel (actual length × unit weight). Excavation per IS 1200 Part 1: trench width = external drain width + 300 mm working space. PCC bed extends 75 mm beyond drain on each side. Raft and walls are M20 RCC measured as net volume excluding any embedded steel. Cover slab (when present) extends full external width and is 150 mm thick by default. Centering and shuttering are measured per IS 1200 Part 2 Clause 5.4 — surface area in contact with concrete; raft is single-face, walls are 4 faces (inner + outer × 2 walls), slab is single-face under-side. Steel quantity at 85 kg/m³ of RCC volume — conservative for storm drains; revise upward for vehicular cover slabs.
Cost benchmark by section
Approximate Delhi DSR 2023 budgets for 50 m of open RCC drain: 300×300 mm internal — ₹85,000 (₹1,700/m); 450×600 mm — ₹1.7 lakh (₹3,400/m); 600×900 mm — ₹3.2 lakh (₹6,400/m); 1200×1200 mm — ₹8.5 lakh (₹17,000/m). Adding a cover slab: roughly +30% on these figures. The per-metre rate scales non-linearly because larger internal sections need disproportionately more wall + raft RCC. State-PWD rates run 8-15% below DSR; municipal corporation SORs are typically cheaper still.