Your assessment of the parking lot, its impact on water quality in Catfish Run and the potential to decrease this impact will require careful measurement of a number of factors.
You will need to know how many parking spaces are actually required.
You will need to know the actual size of the parking lot in order to calculate how much runoff is generated during a given rain event.
You will need to know what types of pollutants are entering Catfish Fish during runoff events.
You will also need to perform a biological, chemical and physical assessment of Catfish Run to provide pre-remediation information for comparison following the parking lot redesign implementation.