Stormwater runoff directly correlates to the amount of impervious surfaces on a property. Runoff can be very damaging. Impervious surfaces allow the water to fill up our pipes and streams faster, increasing the potential for street and/or storm system flooding during heavy rains. This results in increased maintenance and repair requirements of the storm sewer system. By basing the fee on the impervious surface area, residents would pay for the water they contribute to the system.