458PERCENT EFFICIENCY = In – Out X 100
In
TEMPERATURE:^0 F = (^0 C X 9/5) + 32 9/5 =1.8
0 C = (^0 F - 32) X 5/9 5/9 = .555
CONCENTRATION: Conc. (A) X Volume (A) = Conc. (B) X Volume (B)
FLOW RATE (Q): Q = A X V (Quantity = Area X Velocity)
FLOW RATE (gpm): Flow Rate (gpm) = 2.83 (Diameter, in)^2 (Distance, in)
Height, in
% SLOPE = Rise (feet) X 100
Run (feet)
ACTUAL LEAKAGE = Leak Rate (GPD)
Length (mi.) X Diameter (in)
VELOCITY = Distance (ft)
Time (Sec)
N = Manning’s Coefficient of Roughness
R = Hydraulic Radius (ft.)
S = Slope of Sewer (ft/ft.)
HYDRAULIC RADIUS (ft) = Cross Sectional Area of Flow (ft)
Wetted pipe Perimeter (ft)
WATER HORSEPOWER = Flow (gpm) X Head (ft)
3960
BRAKE HORSEPOWER = Flow (gpm) X Head (ft)
3960 X Pump Efficiency
MOTOR HORSEPOWER = Flow (gpm) X Head (ft)
3960 X Pump Eff. X Motor Eff.
MEAN OR AVERAGE = Sum of the Values
Number of Values
TOTAL HEAD (ft) = Suction Lift (ft) X Discharge Head (ft)
SURFACE LOADING RATE = Flow Rate (gpm)
(gal/min/sq.ft) Surface Area (sq. ft)
MIXTURE = (Volume 1, gal) (Strength 1, %) + (Volume 2, gal) (Strength 2,%)
STRENGTH (%) (Volume 1, gal) + (Volume 2, gal)
INJURY FREQUENCY RATE = (Number of Injuries) 1,000,000
Number of hours worked per year
DETENTION TIME (hrs) = Volume of Basin (gals) X 24 hrs
Flow (GPD)
FLUORIDE ION PURITY = (Molecular weight of Fluoride) (100%)
(%) Molecular weight of Chemical