Reservoir Supervision
This page provides guidance for completing format MF4-F75 “Construction_supervision” regarding Reservoir ou RDB supervision.
| PROCEED n° MF4-F57 | Rev 1.0 | Reservoir or RDB Supervision | September 2026 |
| | 'RDB:' Only for RDB supervision | 'R:' Only for Reservoir supervision |
| V1 | Foundation excavation & compaction |
| 1.1 | Supervisor has filled the format MF4-F62 “WP configuration” |
| 1.2 | Check yield compared to design requirement MF4-M50 §4 |
| 1.3 | Foundation depth is at least 30cm and ⌀2.7m MF4-M15 §1 |
| 1.4 | Drop stone test pass (Mark < 1 cm) MF4-M15 §1 |
| 1.5 | Contractor knows masonry size & pipes position in the foundation MF4-M50 §5 |
| 1.6 | PVC outlets & inlets are ready, form MF4-F53 (>4 outlets) or MF4-F54 (≤4 outlets) have been completed to prepare top DB MF4-M51 §2 |
| V2 | Preparation for slab casting |
| 2.1 | 25cm wide 40cm high masonry wall stones inside is constructed (⌀2.2m) MF4-M15 §1 |
| 2.2 | Clean 2cm high lean concrete (1:3:6) is casted on masonry work MF4-M15 §1 |
| 2.3 | Inlet PVC pipe is installed diameter as per design and position as per MF4-M50 §5 |
| 2.4 | Washout ⌀50 PVC pipe is installed with coupling 10cm above lean concrete as per MF4-M50 §5 |
| 2.5 | Outlet ⌀32 PVC pipe is installed, position as per MF4-M50 §5 |
| 2.6 | The overflow, inlet and outlet pipes size match the design or standard |
| 2.7 | Slab rebar mesh is supported by 2-3cm gravel above foundation MF4-M50 §6 |
| 2.8 | The height of the outlet pipe is 3cm above the surface floor |
| 2.9 | Cement is in a dry place, sand is clean and gravel size: 5-20mm MF4-M13 §2 |
| 2.10 | Apparatus to measure sand and gravel quantity is available MF4-MF13 §1 |
| 2.11 | Water agent knows he has to water the slab 2 times a day for 7 days MF4-M50 §6 |
| 2.12 | Inlet, outlet, overflow are installed as per MF4-F53 or MF4-F54. Outllets and inlets for the top DB are 1.9m or 2.9m or 3.9m (1, 2 or 3 rings) MF4-M51 §2 |
| V3 | Wall preparation |
| 3.1 | Slab is properly curred: not too white, not sandy, no cracks. Slab has been cleaned. |
| 3.2 | Outer 15cm (slab-wall conn.) of the slab is prepared with deep cutting MF4-M50 §6 |
| 3.3 | All rings of the inside mould are installed with all bolts and nuts, clean, oiled with cooking oil, centered on the slab and level has been checked in 4 points MF4-M50 §7 |
| 3.4 | Wall rebar installation is OK: mesh dimension, bars diameter, wire ties, ring overlapping not aligned and there is 1.5cm clearance with rebar MF4-M50 §7 |
| 3.5 | First ring of the outside mould is installed with all bolts and nuts, clean, oiled with burnt oil, centered on the slab and level has been checked in 4 points MF4-M50 §7 |
| 3.6 | Concrete mixing platform is prepared and clean MF4-MF13 §4 |
| 3.7 | Cement is in a dry place, sand is clean and gravels size: 5-20mm MF4-M13 §2 |
| 3.8 | Apparatus to measure sand and gravel quantity is available (1:2:3) MF4-MF13 §1 |
| V4 | Wall casting |
| 4.1 | Wall casting starting before 9am, the entire wall must be cast in one day in presence of the supervisor MF4-M50 §8 |
| 4.2 | Concrete is laid from one end, then progressively all around the mould MF4-M50 §8 |
| 4.3 | 15 minutes maximum between 2 concrete batches MF4-M50 §8 |
| 4.4 | Uninterrupted vibration is done with a steel GI pipe inside and a woodden hammer on both sides of the reservoir MF4-M50 §8 |
| 4.5 | If a 2nd or a 3rd ring is necessary, check installation of the mould (centering, level, oil, bolts&nuts, cleanliness) MF4-M50 §8 |
| 4.6 | Call the Water agent the day after casting to ensure the reservoir is full MF4-M50 §8 |
| 4.7 | Call the WA 7 days after casting to ensure the reservoir is still full MF4-M50 §8 |
| V5 | Top slab preparation |
| 5.1 | Framework that willl receive the concrete is concrete tight and solid MF4-M50 §9 |
| 5.2 | Slab rebar mesh is as per MF4-M50 §9 (∅8mm, 15x15cm, ⌀140cm) and there is 1.5cm clearance with mould |
| 5.3 | Slab rebar mesh is supported by 2-3cm gravel above foundation MF4-M50 §9 |
| 5.4 | Door is installed in a way that it is going to be cast in the slab and the washout pipe will be accessible MF4-M50 §9 |
| 5.5 | Concrete mixing platform is prepared and clean MF4-MF13 §4 |
| 5.6 | Cement is in a dry place, sand is clean and gravel size: 5-20mm MF4-M13 §2 |
| 5.7 | Apparatus to measure sand and gravel quantity is available MF4-MF13 §1 |
| 5.8 | Water agent knows he has to water the slab 2 times a day for 7 days MF4-M50 §6 |
| 5.9 | Outlet PVC going in the reservoir (& overflow if necessary) is installed inside rebar & futur DB MF4-M51 §3 |
| 5.10 | Other DB outlets & the inlet pipes will be long enough after top slab casting (50cm higher) MF4-M51 §3 |
| Supervisor has 2 mandatory validation visits. If one item is not validated, correction measures must be agreed with contractor and another visit organized. If not impossible, penalties must be applied (up to contract termination). |
