Cosmos Pumps manufactures submersible and surface drainage pumps for construction sites, basements, flood-prone areas, and municipal drain desilting — rated 1.5 HP to 50 HP, handling flow rates from 450 to 8,500 LPM and solids up to 70 mm. ISO and CE certified. Rental fleet available pan-India.
A drainage pump is a submersible or surface pump designed to remove accumulated water from low-lying areas, construction excavations, flooded basements, and drainage channels. Unlike sewage pumps, drainage pumps handle water containing small to medium suspended solids — sand, silt, gravel — not raw sewage. They are essential equipment on construction sites, highway projects, and during monsoon flood control operations.
Cosmos Pumps’ drainage pump range spans the CDW Submersible Dewatering series (for dirty water with 4–12 mm solids), the CNC Non-Clog series (for thick sludge and 70 mm solids in drains), and the CAP Auto-Prime surface pump (for high-volume site drainage without a grid power connection).
Open excavations, foundation pits, and highway road-cuts accumulate groundwater and rainwater during construction. A submersible drainage pump is lowered into a sump pit at the base of the excavation — the CDW series handles flow rates up to 8,500 LPM and suspended solids up to 12 mm. For large construction sites with limited power supply, the CAP Auto-Prime diesel drainage pump operates from a KOEL, Eicher, or Baudouin engine with no grid connection required.
Flooded basements, parking structures, and underground car parks require compact drainage pumps that fit through standard manhole openings. Cosmos CDW units are available in lightweight aluminium alloy casing designs for easy lowering and recovery. The CDW’s sacrificial zinc anode option extends life in saline groundwater conditions common in coastal construction.
During monsoon season, municipal corporations deploy drainage pumps to manage waterlogging in urban underpasses, low-lying roads, and storm drain sumps. The CNC Non-Clog series handles thick sludge with solids up to 70 mm — standard at 14-inch diameter, it fits standard manhole covers for drain desilting without access-road disruption. Cosmos deploys 80+ pumps per year on flood control assignments.
BRO and NHAI contractors require drainage pumps for road-cut dewatering, culvert excavation, and bridge pile foundation sumps. The CAP Auto-Prime pump on a trailer trolley is the standard choice for remote highway sites without stable power. CDW High Head models (up to 140 M shut-off head) handle deeper highway drain trenches and flyover pylon pits.
Irrigation project channels require dewatering during construction and periodic desilting. The CSP Self-Priming surface pump (up to 4,500 LPM, 28 M head) handles irrigation channel drainage with suction lift up to 9.8 m — useful where the pump cannot be lowered into the channel.
| Parameter | Specification |
|---|---|
| Shut-Off Head | 15.5 M – 86.5 M |
| Flow Rate | 450 – 8,500 LPM |
| HP Range | 1.5 – 50 HP |
| Solids Handling | 4–12 mm suspended solids |
| Water Type | Dirty/muddy water, SG up to 1.1, pH 5–8 |
| Cable | 100% waterproof PVC cable, 15 m |
| Key Features | Aluminium alloy casing · Twin SS seals · Nitride-hardened SS-410 impeller (HRC 52–55) · Class H insulation (180°C) · Sacrificial zinc anode option |
Best for: General site drainage, basement dewatering, foundation pit sumps, highway trench dewatering, flood control sumps.
| Parameter | Specification |
|---|---|
| Shut-Off Head | 40 M – 140 M |
| Flow Rate | 350 – 2,200 LPM |
| HP Range | 5 – 75 HP |
| Solids Handling | 4–12 mm |
| Water Type | Dirty/muddy water, SG up to 1.1 |
Best for: Deep excavation drainage where discharge point is 40–140 M above the sump; flyover pylon pits; multi-level construction sites; tunnel portal drainage.
| Parameter | Specification |
|---|---|
| Shut-Off Head | 22 M – 30 M |
| Flow Rate | 1,250 – 1,500 LPM |
| HP Range | 6 – 20 HP |
| Solids Handling | Up to 70 mm (bottom discharge) |
| Water Type | Thick sludge/viscous mix, SG up to 1.2 |
| Casing | 14-inch diameter — fits standard manhole |
Best for: Municipal storm drain desilting, manhole cleaning, drain channel sludge removal, construction dewatering with heavy debris.
| Parameter | Specification |
|---|---|
| Shut-Off Head | 2 M – 169 M |
| Flow Rate | Up to 4,469 m³/h (74,483 LPM) |
| HP Range | Up to 1,550+ HP |
| Suction Lift | 9.8 m (auto-prime; runs dry without damage) |
| Engine Options | KOEL · Eicher · Baudouin · CAT |
| Solids | Up to 75 mm (open impeller variant) |
| Mounting | Trailer trolley · Base frame · Canopy (soundproof) |
Best for: Large-volume highway drainage, remote sites without power, flood control, BRO/NHAI highway construction, pump-relay systems over long distances.
In practice, the terms are often used interchangeably in construction, but there are engineering distinctions that affect pump selection:
| Feature | Drainage Pump | Dewatering Pump |
|---|---|---|
| Primary application | Removing surface water accumulation from low-lying areas, basements, flood-prone areas | Lowering groundwater table for excavation; removing water as it enters a site |
| Solids handling | Light to moderate (4–70 mm depending on model) | Light to moderate — same product range, different application context |
| Typical installation | Temporary sump at lowest point of flooded area | Sump pit at excavation base; sometimes wellpoint manifold |
| Head requirement | Usually low to medium (15–50 M) | Varies widely — tunnels may need 90–200 M head |
| Cosmos product | CDW Standard, CNC, CAP Auto-Prime | CDW Standard/HH/UHH, CAP Auto-Prime, CSP Self-Priming |
Bottom line: If your site is flooded or has surface water to remove, a drainage pump handles it. If you need to actively lower a groundwater table for excavation, a dewatering pump is the engineering term — but the equipment is often the same CDW or CAP series used for both duties.
Cosmos operates one of India’s largest drainage pump rental fleets: 500+ submersible drainage pumps (1.5–75 HP CDW series) and 50+ diesel auto-prime drainage pumps (60–105 HP CAP series). Rental is available pan-India with 24-hour mobilisation for emergency monsoon drainage.
Key rental advantages: zero capital outlay, no maintenance cost, quantity flexibility (scale from 1 pump to 80+ for flood control operations), and backup resources to minimise downtime.
View drainage pump rental options →
For most construction site drainage, the Cosmos CDW Submersible Dewatering Pump (1.5–50 HP) is the standard choice. It handles flow rates up to 8,500 LPM and suspended solids up to 12 mm — sufficient for excavation sumps, trenches, and flooded foundation pits. For remote highway sites without power, the CAP Auto-Prime diesel drainage pump (KOEL or Eicher engine, trolley-mounted) is the correct selection. Contact Cosmos for site-specific sizing assistance via WhatsApp: +91 99333 22238.
A submersible pump is a broad category of pumps that operate fully submerged in liquid. A drainage pump is a type of submersible pump specifically designed for removing dirty water with suspended solids. The Cosmos CDW series is both a submersible pump and a drainage pump — it is lowered into a sump, operates fully submerged, and handles the dirty/muddy water typical of construction drainage applications.
Standard drainage pumps (CDW series) handle water with up to 12 mm suspended solids — they are not designed for thick sludge or slurry. For heavy sludge drainage (storm drain desilting, manhole cleaning), the Cosmos CNC Non-Clog series handles solids up to 70 mm and SG up to 1.2. For mining slurry (SG up to 2.1), the CSL Slurry series is the correct choice.
HP selection depends on two parameters: the volume of water to be removed (LPM) and the total discharge head (vertical lift + friction losses in discharge pipe). As a guide: a 2 HP CDW pumps approximately 1,200 LPM at 20 M head; a 10 HP CDW handles approximately 3,500 LPM at 35 M head; a 50 HP CDW delivers up to 8,500 LPM. For accurate site-specific sizing, share your pit depth, discharge distance, and water inflow rate with Cosmos’s technical team via the enquiry form or WhatsApp.
A drainage submersible pump is a submersible motor-pump unit — motor and pump assembled in a single sealed housing — designed to be fully submerged in the water being pumped. Cosmos CDW drainage submersible pumps operate with the full unit underwater; the motor is cooled by the surrounding liquid and operates at up to 180°C (Class H insulation) for continuous-duty drainage applications on construction sites and flood control operations.
It depends on your site’s power availability. Electric submersible drainage pumps (CDW series) are more efficient, quieter, and require less maintenance — the right choice when a reliable 3-phase supply is available. Diesel auto-prime drainage pumps (CAP series) are essential for remote sites without power (highway construction, border projects, rural flood control) and for very high-volume applications where the flow capacity (up to 74,483 LPM) exceeds what electric submersibles can provide. Cosmos offers both in its rental and purchase fleet.
Cosmos CDW submersible drainage pumps are rated for continuous-duty operation. Class H motor insulation (180°C rated) provides a safety margin above the operating temperature. For prolonged dewatering campaigns (monsoon drainage, tunnel dewatering), Cosmos recommends deploying units in relay configuration so pumps can be rotated for maintenance without stopping dewatering operations.
Standard CDW drainage pumps use stainless steel (SS-304) hardware and bronze impeller components. For saline water (coastal construction, harbour desilting), Cosmos offers a CDW SS-316 variant with full stainless steel wetted components and a sacrificial zinc anode to resist chloride corrosion. Specify the seawater variant when ordering for coastal or marine drainage applications.
Cosmos Pumps supplies drainage pumps for purchase and rental across India and for export to UAE, Saudi Arabia, Nigeria, and 20+ countries. For product specifications, availability, and pricing, contact our technical team:
It removes unwanted water from a site. It pushes or pulls water through pipes to keep areas dry.
For detailed product specifications, flow ratings, and application guidance, see our drainage pump range page.
A drainage pump handles surface water. A dewatering pump is often used for deeper groundwater.
They are used in construction, mining, cities, and factories. They work wherever water needs to be removed.
Check water volume, depth, and site needs. Our team can guide you to the best option.
Yes, we supply both electric and diesel options. You can choose based on your site.
Yes, they are built to meet global standards. They work well in any country.
Yes, they can handle solids and muddy water. They are strong and reliable.
Our pumps last for many years. With care, they can serve even longer.
Yes, we give full support with spares. Our service team is always available.
You can contact us directly for a quote. We also provide brochures on request.
Drainage pumps in India are used for removing water from construction sites, industrial areas, and residential basements.
Cosmos Pumps offers drainage vacuum pumps, drainage suction pumps, and general drainage pumps for various applications.
You can contact suppliers to get guidance and request quotes for pumps suitable for your project needs.
In Qatar, drainage pumps are used for construction site dewatering, industrial water management, and flood control.
Drainage pumps help remove excess water efficiently, ensuring smooth operation in construction, industrial, and municipal projects.
In the UAE, both submersible and centrifugal drainage pumps are used for construction, industrial, and commercial water management.
Cosmos Pumps is a trusted supplier in Qatar, Saudi Arabia, and the UAE, providing durable and efficient drainage pumps for all applications.