The protection of life, land, and property from damage by excess water, whether in motion or standing, is the purpose of various flood control and drainage measures. Flooding occurs from storms that produce runoff exceeding the capacity of the normal stream channels. Long, heavy, widespread storms, or rapid melting of snow from a large area cause floods on main stem streams and rivers. As urban density increases, so do the problems of flooding from storm water runoff.
Upper Macungie Township, through the wide expanse of storm sewer inlets and underground pipes, has managed to control storm water runoff and keep damage to a minimum within the township. The storm sewer system is comprised of hundreds of inlets and manholes that drain into over 50 miles of underground pipes, which lead into detention basins located throughout the township. The purpose of these detention facilities is to store the storm water runoff and then infiltrate the water at a controlled rate so as not to adversely affect downstream property. One of the most important aspects of a storm water system is the fact that it will drain into the ground or a stream, which then becomes a source for our drinking water supply. For this reason the federal government and the State of Pennsylvania has established strict guidelines which need to be followed when dealing with or working around storm sewers.
The Pennsylvania legislature enacted the Storm Water Management Act (No. 167) in 1978 to authorize a program of comprehensive watershed storm water management, which retains local implementation, and enforcement of storm water ordinances similar to local responsibility of administration of subdivision and land development regulations. This planning effort results in the incorporation of sound engineering standards and criteria into local codes and ordinances to manage runoff from new development in a coordinated, watershed-wide approach.