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It looks like it means Day-Second-Feet, which is a variation on Second-Foot Day (SFD).

Second-feet is a unit of measurement of liquid flow equal to one cubic foot per second.

A Second-Foot Day would be the volume of water represented by a flow of 1 cubic foot per second for 24 hours.

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6y ago
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Q: What is the meaning of DSF when referring to water inflow?
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