Why does my waterpump have low pressure?

The site of an ancient community of fishing villages, the modern port-city of Karachi was developed by authorities of the British Raj in the 19th century. Upon the creation of Pakistan in 1947, the city was selected to become the national capital, and was exposed to a massive influx of immigrants from India, which radically expanded the city's population and transformed the demographics and economy. Karachi has faced major infrastructural and socio-economic challenges, but modern industries and businesses have developed in the city, and the population expanded even after the capital was moved to Islamabad in August 1960.