Since 1972, environmental officials have made strides in dealing with the pollution that comes from industrial pipes and other identifiable sources. But as suburbs have grown, storm water has become the bigger problem. Town officials and others say they want broader fixes with more flexibility, not one-size-fits-all regulations. Last year, the nonprofit Pennsylvania Environmental Council hired Temple researchers to fan out across the Wissahickon Creek watershed and identify storm-water improvements. They came up with about 300. "These could be bartered by the municipalities as part of a trading system," said Jeffrey Featherstone, a regional planning professor at Temple. "But in order to do effective trading, you have to have a good plan."