Formula in Wastewater Eng’g
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6 Terms
1
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Pt = Po + Kt
Where:
Pt = Population @ time projected
Po = Present Population
K = constant increase
t = time in years
Arithmetic Method (Population Projection)
2
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Pt = Po (1 + r)^t
Geometric Method (Population Projection)
3
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RE % = (Actual Value - Measured Value)/ (Actual Value) x 100
Relative Error
4
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TS (mg/L) = (total solids weight)/ (sample weight)
Total Solids
5
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% VS = (VS weight)/(Total Solids weight)x100%
Volatile Solid Percentage
6
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Proportioning Factor = (Total Sample Volume Req'd in mL)/(# of samples to be calculated x Average Daily Flow in MGD)
Composite Sampling Calculation
Note 
Flashcards (47)