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Curve Number for mulch

Curve Number for mulch

Curve Number for mulch

(OP)
Where can i find CN for mulch in soil group D?

Thank you.

RE: Curve Number for mulch

At best, this might approximate "Open space, good condition, grass cover >75%" with a CN of 80.  (From the TR-55 CN tables, HSG D)

Worst case is likely to be "...poor condition, grass cover <50%" with a CN of 89.  (Same CN as HSG-D dirt roads.)

The exact type, depth, and condition of the mulch will defintitely influence where you fall in this range.  But you may need to base the design on the worst-case (maximum) CN.

RE: Curve Number for mulch

Mulch floats so you really have to check your design storm.  Unless your mulch is anchored I might skip it unless you are worried about very small events.  In this case I would use an initial abstration which will be dependent on the thickness of the mulch.  For (limited) humor, worst case you should bulk your flows.

RE: Curve Number for mulch

I can't imagine a large enough mulched area for the CN to be critical.  It's not like one mulches a 10 acre field, but usually landscaping.

I would be tempted to use a CN for Woods (thin stand) as in winter the conditions, certainly in deciduous areas, are a thick leaf mulch bed.

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