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Dr. Ernest Tollner, Ph.D., P.E., M.ASCE


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RE: Please provide your opinion about CN values for VERY LARGE RAINFALL events

Posted By Ernest Tollner 03-31-2017 03:50 PM
Found In Egroup: Environment, Coasts, Oceans, & Infrastructure \ view thread
Hi Mike and all, I took a quick look at an 8000 acre region in Lexington/Richland County just below Columbia with Web Soil Survey. There appear to be many A/B soils with some significant C/D soils in the region. Slopes were zero to 2% for the most part. Available (0 to 60 inch) storage ran about ...

RE: NRCS Curve Number for Railroad Ballast

Posted By Ernest Tollner 04-22-2016 02:41 PM
Found In Egroup: Environment, Coasts, Oceans, & Infrastructure \ view thread
Hello everyone, I suspect that the railroad ballast question is not too far removed from a composting pad consisting of 6” of crush-run aggregate over a compacted clay soil. Infiltration occurs until the pore space in the aggregate is filled, then runoff occurs at a rate of (rainfall – drainage) ...