How do I choose the right dewatering pump size (HP) for my project?

Correct HP selection depends on four variables: required flow rate (LPM), total head (metres from water surface to discharge point), water type, and available power source. For the Cosmos CDW submersible range: 1.5-3 HP handles 450-1,200 LPM at heads up to 30 metres for small construction sumps; 5-10 HP suits 1,500-3,000 LPM at 40-60 metres for medium tunnel and basement dewatering; 15-50 HP handles 4,000-8,500 LPM or heads above 70 metres for large infrastructure sites, mines, and highway cuttings. For slurry (CSL range, SG up to 2.1): upsize by 30-50% versus clean water calculations. For sewage (CSW range): solid size (20-100 mm) determines pump selection as much as HP — a 50 HP CSW handles 33,000 LPM at 60 metres head. For surface auto-prime (CAP range): available in 2 HP to 1,550+ HP — selected primarily by flow rate and required suction lift. Always measure actual site conditions before ordering. Contact Cosmos technical sales at +91 99333 22238 with site measurements for a precise recommendation.