You can determine this by considering the geography and location of your farm relative to nearby navigable waters (such as streams, creeks and other waterways). You should consider if ditches, gullies, storm sewers or other drainage systems may transport an oil spill to nearby streams. Estimate the volume of oil that could be spilled in an incident and how that oil might drain or flow from your farm and the soil conditions or geographic features that might affect the flow toward waterways. Also you may want to consider whether precipitation runoff could transport oil into navigable waters or adjoining shorelines. You may not take into account manmade features, such as dikes, equipment, or other structures that might prevent, contain, hinder, or restrain the flow of oil. Assume these manmade features are not present when making your determination. If you consider the applicable factors described above and determine a spill can reasonably flow to a waterway, then you must comply with the SPCC rule.