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Suspended load is discharge times concentration: 14 m3/s at 250 mg/L moves 3.5 kg a second, 302 tonnes a day and about 110,000 tonnes a year. Because concentration rises steeply during floods, most of the annual load is usually carried in a handful of high-flow days, so mean values badly understate event transport.
Transport rate
load(kg/s) = discharge(m3/s) x concentration(mg/L) / 1000
Period load
tonnes = rate x seconds / 1000
Because both discharge and concentration peak together in storms, so transport scales far faster than flow - often as a power of two or three.
No. Bed load - material rolling along the bottom - typically adds another 5-20% and needs separate measurement.