Great input everyone. I will try to make this question short:

One of my potential sites has a lot of Ipava Silt Loam which seems to be is good but the site would require a long but low berm/dam on one side. The Soil Survey Site states that Ipava is "Very Limited" for Embankments, Dikes, & Levees due to "Depth to Saturated Zone" with a (1.00) factor.

Can someone please explain why "Depth to Saturated Zone" makes a specific soil bad for burms and dams?