Environmental Engineering FOURTH EDITION

List of Symbols 459

j
J

LAER

LCF

total head, m or ft (Chap. 5)

ShannonAVeaver diversity index

total head loss through a filter, m or ft

Hertz, cycles/s

geometric stack elevation, m

fraction of BOD not removed in the primary clarifier

depth of landfill, m

net discharge head, m or ft

head loss, m or ft

head loss in the ith layer of media at time t

net static suction head, m or ft

fraction of BOD not removed in the biological treatment step

rainfall intensity, in./h

initial BOD of sample, mg/L

initial BOD of seeded dilution water, mg/L

fractions of solids not destroyed in digestion

Pielov’s equitability index

soil erodibility factor, ton/acreiR unit

proportionality constant for minor losses, dimensionless

coefficient of permeability, m3/day or gdday

fraction of atoms that disintegrate per second = 0.693/tlp

fraction of influent SS removed in the primary clarifier

saturation constant, in mg/L

deoxygenation constant, (log,) s-l

reoxygenation constant, (log,) s-l

kilowatts

kilowatt-hours

depth of filter, m or ft (Chap. 6)

length, m or ft

topographic factor (dimensionless ratio)

ultimate carbonaceous oxygen demand, in mg/L

length of cylinder in a cyclone, in m

length of cone in a cyclone, in m

feed particle size, 80% finer than, pm

ultimate BOD upstream from wastewater discharge, mg/L

product size, 80% finer than, p,m

ultimate BOD in wastewater effluent, mgL

x percent of the time stated sound level (L) was exceeded,

percentage

lowest achievable emission rate

latent cancer fatalities