The Inter-Modal Transportation Authority (ITA) claims that the Kentucky TriModal Transpark will not pollute Mammoth Cave because water from the Transpark would have to flow nine miles upstream. These diagrams illustrate why the ITA's assumption is incorrect. Although it is true that a subsurface drainage divide exists between the Transpark site and Mammoth Cave, heavy rainfall can cause the groundwater to rise high enough to spill over the divide and flow into the Mammoth Cave drainage basin.

Normal water table beneath the Sinkhole Plain	During heavy rainfall, a 50' to 70' water rise can spill over the divide and flow into the Mammoth Cave drainage basin. Extremely heavy rains occur every few years. Pollutants like gasoline float on top of the flood	A 60' to 95' rise in the Mammoth Cave basin spills over into the Graham Springs drainage basin
You can click on each small map to see a larger version