Tulsa has the highest CRS rating in the country and is currently at 2. Although this high rating is only partially attributed to its ordinances, its ordinances reflect very high standards. The ordinances are based on watershed development and include stormwater consideration. “The area of special flood hazard, policies and standards” provision endorses the concept of No Adverse Impact, specifically denying any development that would increase flows, flood heights, velocities that might affect other property and, in addition providing for compensatory storage.