This increases the chance of flooding and harms the water quality of the streams. Local flooding can occur. This means that the water that used to soak into the ground now runs off into streams. The runoff can also be collected by storm sewers and sent to small streams, which can flood. Urbanization is finished by the addition of more roads, houses, and commercial and industrial buildings.
More wastewater is discharged into local streams.
New water-supply and distribution systems are built to supply the growing population. Reservoirs may be built to supply water. Some stream channels are changed to accommodate building construction. Industries might drill some deep, large-capacity wells. This will lower the water table.