--- title: "Aqueduct: excavation, concrete, brick, RCC" subject: "Estimating and Costing" chapter: 6 key: "semester_7/estimating_and_costing:aqueduct-v-four-items" source: https://www.bctengineer.com/q/semester_7/estimating_and_costing/aqueduct-v-four-items site: BCT Engineering --- # Aqueduct: excavation, concrete, brick, RCC Estimating and Costing · Chapter 6: Detailed Estimate - Asked in: 2065 Shrawan (old course), 15 marks - Video: [5TH SEM CIVIL ENGINEERING, ECE-II, CH-1, DETAILED ESTIMATE OF BRIDGE AND CULVERT , PART- 6](https://www.youtube.com/watch?v=YgwQkBE8ni0) — Nilachal Polytechnic College Of Engineering - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_7/estimating_and_costing/aqueduct-v-four-items - Whole chapter: https://www.bctengineer.com/md/semester_7/estimating_and_costing/chapter-6 ## Question Estimate the quantities of the following items of work from the accompanying drawing. (Aqueduct) a) Earthwork in excavation b) Cement concrete in foundation c) Brick work d) RCC work [Drawing not included in the scanned paper] ## Short answer Using length x breadth x depth on assumed dimensions, quantities are Earthwork excavation 40.50 m3, cement concrete 1:3:6 5.76 m3, brickwork 1:6 22.50 m3, and RCC trough 7.13 m3. Substitute actual drawing dimensions in the same format; reinforcement is taken separately. ## Answer A drawing is not given, so the method is shown on an assumed small aqueduct: a **single-span RCC trough** carrying an irrigation canal over a drain, resting on two brick abutments with four wing walls. All quantities are by the **centre-line / length × breadth × depth** method. #### Assumed data - Trough: clear span 6.0 m, bearing 0.3 m each end (length 6.6 m), internal width 2.0 m, depth 1.2 m, walls 0.20 m, bottom slab 0.25 m, so outside width 2.4 m. - Abutments (2 nos.): length 3.4 m, thickness 0.9 m, height 2.5 m above PCC, in 1:6 brickwork; PCC 1:3:6 bed 4.0 m × 1.5 m × 0.30 m. - Wing walls (4 nos.): 2.0 m long, mean thickness 0.45 m, mean height 2.0 m; PCC 2.0 m × 0.9 m × 0.30 m. - Abutment pit depth 1.5 m with 0.3 m working space on each side; wing-wall trench 1.2 m wide, 1.2 m deep. #### a) Earthwork in excavation | Item | No. | L (m) | B (m) | H/D (m) | Qty (m³) | |---|---|---|---|---|---| | Abutment pits (2 nos., working space 0.3 m) | 2 | 4.600 | 2.100 | 1.500 | 28.980 | | Wing-wall trenches (4 nos.) | 4 | 2.000 | 1.200 | 1.200 | 11.520 | | **Total** | | | | | **40.500** | #### b) Cement concrete in foundation (1:3:6) | Item | No. | L (m) | B (m) | H/D (m) | Qty (m³) | |---|---|---|---|---|---| | Abutment PCC 1:3:6, 0.30 m thick | 2 | 4.000 | 1.500 | 0.300 | 3.600 | | Wing-wall PCC 1:3:6 | 4 | 2.000 | 0.900 | 0.300 | 2.160 | | **Total** | | | | | **5.760** | #### c) Brick work (1:6 cement sand mortar) | Item | No. | L (m) | B (m) | H/D (m) | Qty (m³) | |---|---|---|---|---|---| | Abutment wall, 1:6 brick | 2 | 3.400 | 0.900 | 2.500 | 15.300 | | Wing walls (mean thickness 0.45, mean height 2.0) | 4 | 2.000 | 0.450 | 2.000 | 7.200 | | **Total** | | | | | **22.500** | #### d) RCC work (trough, M20) | Item | No. | L (m) | B (m) | H/D (m) | Qty (m³) | |---|---|---|---|---|---| | Trough bottom slab | 1 | 6.600 | 2.400 | 0.250 | 3.960 | | Trough side walls | 2 | 6.600 | 0.200 | 1.200 | 3.168 | | **Total** | | | | | **7.128** | Reinforcement is then taken separately (about 80–100 kg per m³ of trough concrete as a check). **Answer:** Excavation = 40.50 m³; PCC = 5.76 m³; brickwork = 22.50 m³; RCC = 7.13 m³ (for the assumed dimensions; substitute the dimensions of the actual drawing in the same format). Quantities are taken in the usual order: length × breadth × height/depth, in cubic metres (m³) or square metres (m²), with deductions entered as negatives. Rates are not asked; when costing, apply the current District Rate and DUDBC rate-analysis norms of the district. ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. The trough has internal width 2.0 m and walls 0.20 m thick. What outside width is used for the bottom slab? A. 2.2 m B. 2.4 m C. 2.0 m D. 2.6 m Answer: B. Outside width = 2.0 + 2 x 0.20 = 2.4 m, since a wall lies on each side. (Key point: Outside width of trough) 2. How is the abutment pit size 4.6 m x 2.1 m obtained? A. PCC bed 4.0 x 1.5 m plus 0.3 m working space on each side B. Abutment 3.4 x 0.9 m plus 0.6 m on each side C. Trough 6.6 x 2.4 m minus 2 m D. PCC bed 4.0 x 1.5 m plus 0.3 m on one side only Answer: A. Working space of 0.3 m is added on each side of the 4.0 x 1.5 m PCC bed: 4.6 x 2.1 m. (Key point: Working space in excavation) 3. Which pair of parts makes up the RCC trough quantity (7.128 m3)? A. Bottom slab 6.6 x 2.4 x 0.25 and two side walls 6.6 x 0.20 x 1.2 B. Abutments and wing walls C. Bottom slab only plus PCC beds D. Two side walls only, 6.6 x 2.4 x 1.2 Answer: A. RCC = bottom slab 3.960 m3 + two side walls 3.168 m3 = 7.128 m3. (Key point: RCC components of trough) 4. Why is the trough length 6.6 m when the clear span is 6.0 m? A. The wing walls add 0.6 m B. Bearing of 0.3 m is added at each end C. Working space of 0.3 m is added each end D. Walls are 0.2 m thick, so 0.6 m is added Answer: B. The trough rests 0.3 m on each abutment, so length = 6.0 + 2 x 0.3 = 6.6 m. (Key point: Trough length) ## Close variants set in other exams - [Earthwork, concrete, brick, RCC from drawing](https://www.bctengineer.com/question.md?key=semester_7%2Festimating_and_costing%3Adrawing-four-items-s) — Estimating and Costing, chapter 6, asked 2× ## Related in Estimating and Costing - [RCC slab culvert: excavation, PCC foundation, slab](https://www.bctengineer.com/question.md?key=semester_7%2Festimating_and_costing%3Aslab-culvert-j) — Estimating and Costing, chapter 6 - [Building: excavation, brick 1:4, wood work](https://www.bctengineer.com/question.md?key=semester_7%2Festimating_and_costing%3Abuilding-k-fig1) — Estimating and Costing, chapter 6 - [RCC slab culvert (u): four items](https://www.bctengineer.com/question.md?key=semester_7%2Festimating_and_costing%3Aslab-culvert-u-four-items) — Estimating and Costing, chapter 6 - [Load bearing building: excavation, brick, plaster](https://www.bctengineer.com/question.md?key=semester_7%2Festimating_and_costing%3Abuilding-g-load-bearing-23) — Estimating and Costing, chapter 6 - [RCC slab culvert 1.5 m span: four items](https://www.bctengineer.com/question.md?key=semester_7%2Festimating_and_costing%3Aslab-culvert-n-four-items) — Estimating and Costing, chapter 6 - [Well foundation: excavation, sinking, brick, PCC curb](https://www.bctengineer.com/question.md?key=semester_7%2Festimating_and_costing%3Awell-foundation-d-four-items) — Estimating and Costing, chapter 6, asked 2×