How Urban and City Dwellings Provide Plants with Water:
In urban areas where groundwater cannot be tapped, the supply of water is limited even to a point of being scarce. Factors such as population growth and the cost of water contribute largely to the availability or unavailability of water. Unlike in rural areas where water can be drawn from wells, springs or river, city water passes through pipes. The supply is also limited since there is a schedule to follow and water is available only every other day or at least three times a week.
Those who are into gardening or some form of vegetation make use of rainwater. Rather than provide the solution, sustaining the vegetation with rainwater can prove to be even more damaging to plant growth.
The sulphur dioxide and nitrogen oxide that rises in the atmosphere will interact with the rain or snow fall, thus increasing the levels of salinity and acidity in the quality of water.Rainwater particularly in urban areas has increased acidity levels compared to that in the rural areas.
The precipitation of air contains pollutants coming from motorized vehicles and industries that make use of fossil fuel. The larger demand for heat and electrical generation common to city life further aggravates air pollution. Even ambient air or that which comes from outside the city carry polluted air, albeit coming from other contaminated sources. .
The poor quality of water is also influenced by human waste water disposal, where groundwater reservoir in the city's outskirts are contaminated with mismanaged wastes coming from irresponsible business establishments including hospitals, medical and dental clinics, factories and industrial sites.
Water-run offs passing through city streets littered with wastes that leach or of heavy metals that interact with acid water and oil puddles. Run-offs pass through canals and are eventually carried to the mainstreams especially when flooding occurs.
These are the factors that degrade the quality of water in city and urban environment.