2. a pristine stream flowing at 100 cubic feet per second (cfs) in the rocky mountains contains 5 mg/l of suspended solids (ss). during the spring, ice melt conveys an additional 250 mg/l of tss at a rate of 20 cfs into the stream. determine the concentration of tss in the stream during the spring. (5 pts)

Total suspended solids, or TSS for short, are waterborne particles larger than 2 microns. On the other hand, every particle less than 2 microns is referred to be a completely dissolved solid (TDS). Algae and bacteria can also be categorized as total suspended solids (TSS), however inorganic materials make up the majority of TSS.

Sand, silt, and plankton are all examples of TSS because they are all floating or "suspended" in water. The organic particles released into the water when some water sources are polluted by dead plants or animals are typically suspended solids. While some silt will sink to the bottom of a body of water, other TSS may float to the top or hang suspended somewhere in the middle. TSS has an impact on water clarity, hence the more TSS is present in a water supply, the less clear it will be.

Given in the question,

flow rate of stream (Q1) = 100 cfs

concentration of suspended solids (S1) = mg/l

During spring time,

concentration of TSS (S2) = 250 mg/l

flow rate of stream (Q2) = 20 cfs

The concentration of a mixture is calculated by:

[tex]C = \frac{Q_1 S_1 + Q_2 S_2}{Q_1 + Q_2}[/tex]

[tex]C = \frac{100 \times 5 + 20 \times 250}{100+20}[/tex]

[tex]C = 45.833[/tex] mg/l

Therefore, concentration is 45.833 mg/l

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