| # | 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 | 19.32 | 260.30 | 5,029.00 |
| 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 | 2.58 | 6,812.00 | 17,574.96 |
| 3 | 7.1.1 | Rrm FoundationRandom 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 | 14.40 | 7,311.25 | 1,05,282.00 |
| 4 | 7.2.1 | Rrm Dam BodyRandom rubble masonry with hard stone in superstructure above plinth level and upto floor five level, including leveling up with cement concrete 1:6:12 (1 cement : 6 coarse sand : 12 graded stone aggregate 20 mm nominal size) at window sills, ceiling level and the like. — Cement mortar 1:6 (1 cement : 6 coarse sand) | Cum | 28.08 | 9,275.45 | 2,60,454.64 |
| 5 | 4.1.3 | CopingProviding and laying in position cement concrete of specified grade excluding the cost of centering and shuttering - All work up to plinth level : — 1:2:4 (1 cement : 2 coarse sand (zone-III) derived from natural sources : 4 graded stone aggregate 20 mm nominal size derived from natural sources) | Cum | 0.72 | 7,878.50 | 5,672.52 |
| 6 | 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 | 9.00 | 7,311.25 | 65,801.25 |
| 7 | 7.1.1 | Curtain WallRandom 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 | 1.08 | 7,311.25 | 7,896.15 |
| 8 | 7.1.1 | Upstream PitchingRandom 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 | 3.60 | 7,311.25 | 26,320.50 |
| Your inputsCrest length 12 m · Dam height above stream bed 1.8 m · Crest width 0.6 m · Base width 2 m · Foundation depth below bed 0.6 m · Downstream apron length 2.5 m · Concrete coping on top · Upstream stone-pitching length 1.5 m | TOTAL | ₹4,94,031 | ||||
- Trapezoidal section: typical 0.6 m crest + 2.0 m base + 1.8 m height for plain-terrain MGNREGA check dam. Hilly-terrain dams have wider base (2:1 d/s slope, 1:1 u/s) for stability.
- Foundation depth 0.6 m below stream bed is standard; increase to 1.0-1.5 m in alluvial / scour-prone beds with un-keyed foundation.
- Curtain wall (cut-off wall) is a 0.30 × 0.30 m random-rubble strip below dam body at upstream face — prevents seepage scour. Universal in MGNREGA check-dam design.
- Downstream apron is a 0.30 m thick random-rubble stone-pitched pad extending 2-3 m downstream of dam toe — prevents erosion from falling water. Skip only if natural rock outcrop exists at downstream face.
- PCC coping (100 mm) on crest is a protective concrete band to prevent wave-overtopping erosion. Toggle off for very-low-budget MGNREGA dams under 1.2 m height.
- Excludes: stilling basin / energy dissipator (for dams > 3 m height per IS 6066); inlet/outlet sluice with gate (only required for irrigation off-take); fish-pass / wildlife crossing (where ecological mandate exists); upstream silt-fence / sediment basin; gabion side-wing extensions; bed protection upstream of dam (typically not needed for small dams).
**Check dams** are the workhorse water-conservation structure in India's watershed schemes — MGNREGA's water-conservation guidelines mandate 30-65% of block spending on water works, and check dams (along with farm ponds) dominate that allocation. The standard CPWD / IS 6066 configuration is a **trapezoidal random-rubble masonry weir** spanning the drainage line, with PCC bed below + PCC coping on top + stone-pitched apron downstream + curtain wall upstream. Sized 5-50 m crest length × 1-3 m height per micro-watershed needs. This BOQ Builder generates the complete cost per CPWD DSR 2023.
Types of check dams and when to use each
**Loose-boulder check dam** — smallest + cheapest, just rocks piled across a drainage line, ~₹500-1,000/m³. For micro-watersheds with stable banks + low rainfall, MGNREGA's most basic permissible work. Lasts 3-5 years before requiring re-grading. **Random-rubble masonry check dam** (this Builder) — stone-in-cement-mortar weir, trapezoidal cross-section, 1-3 m height. Standard for MGNREGA + PMKSY block-watershed projects. ₹3,500-7,500/m³. Lasts 15-25 years. **RCC check dam** — used for catchment areas > 10 hectares, height > 3 m, or where bank-erosion is severe. Uses RCC instead of stone masonry for the dam body. ₹9,000-12,000/m³. Lasts 30-50 years. **Gabion check dam** — hexagonal-wire-mesh-encased rock fill, used for very narrow / steep channels where rigid masonry would crack. Lasts 10-20 years. This Builder is for the standard random-rubble version which fits 90% of MGNREGA + PMKSY projects.
What's in the BOQ and what's excluded
**Included** — earthwork in foundation trench across the drainage line, 100 mm PCC bed below masonry, random-rubble foundation masonry (DSR 7.1.1) below stream bed, random-rubble dam body (DSR 7.2.1) above bed, PCC coping (DSR 4.1.3) on crest, downstream apron (stone-pitched with 300 mm RRM thick), upstream curtain wall (cut-off wall). **Excluded** — stilling basin / energy dissipator (required for dams > 3 m height per IS 6066 Cl. 7.5 — small concrete basin downstream of toe); inlet/outlet sluice + gate (only if irrigation off-take is needed); fish-pass / step-fall (where ecological mandate from forest dept); upstream silt-fence / sediment basin to extend dam lifespan; gabion wing-walls on either bank for slope stabilisation; bed protection upstream (rip-rap stone pitching for 5-10 m up-stream of dam, only for high-velocity channels). For most rural MGNREGA + PMKSY check dams, the items in this Builder are sufficient — the excluded items are project-specific add-ons.