Ridley Park is a borough in Delaware County, Pennsylvania, United States. The population was 7,002 at the 2010 census. Ridley Park is the home of The Boeing Company's CH-47 Chinook helicopter division.[4]
10. Contaminated surface water can eventually enter groundwater and contaminate it. 11. Depending on the type of soil or rock, groundwater will flow at different rates. 12. Rain and snowmelt infiltrate (seep) into the ground to become groundwater. 1. False.
Flow type 3, defined by Bodhaine (1968) , also is submerged because the downstream water-surface elevation is greater than the elevation of critical depth in the culvert. Each of the other flow types defined by Bodhaine (1968) is free flow. The downstream water-surface-elevation limit is the tail-water elevation at which free flow ends and submerged flow begins. 2  For example, for culvert-flow type 2, the downstream water-surface-elevation limit is critical depth in the culvert barrel.