Inland Water Engraining & Constructions (Pvt) Limited Provide the services of Sewerage system in Pakistan. Sewerage system plays a vital role in the economic development of a country. Sewers are must for the drainage of waste water. In order to have an effective sewage system. Sewers are designed for the drainage of waste water coming from houses, industries, streets, runoff etc. to protect the environment. So for a good living, the sewers should be properly designed and the sewage should be treated.