458 ENVIRONMENTLENGINEERING
D(t)
D ord
D
D
DO
DOT
d
d'
dc
dB
Ds
DP
dd4Y
E
E
E
E
EL4
EIS
Em
EPA
EQI
e
esu
eV
F
F
FONSI
FB
FD
Fg
f
F'
G
GL
G
GY
g
Horh
H
H
oxygen deficit at time (t), in mg/L.
diameter, in m or ft or in.
deficit in DO, in mgL
dilution (volume of sampldtotal volume) (Chap. 4)
initial DO deficit, in mgL
U.S. Department of Transportation
depth of flow in a pipe, in m or in. (Chap. 7)
geometric mean diameter between sieve sizes, m or ft
cut diameter, in m
decibel
oxygen deficit upstream from wastewater discharge, mgL
oxygen deficit in wastewater effluent, mg/L
rate of shear, or slope of the velocity @)-depth b) profile
rainfall energy, ft-tondacre inch
efficiency of materials separation
evaporation, mm
symbol for exponent sometimes used in place of 10.
environmental impact assessment
environmental impact statement
environmental impact unit
U.S. Environmental Protection Agency
environmental quality index
porosity fraction of open spaces in sand
electrostatic unit of charge
electron volt = 1.60 x joule
final BOD of sample, mg/L
food (BOD), in mgL
finding of no significant (environmental) impact
buoyant force, in N
drag force, in N
gravitational force, in N
friction factor
final BOD of seeded dilution water, mgL
flow in a thickener, kg/m2 x s (Chap. 9)
limiting flux in a thickener, kg/m2 x s
velocity gradient, in s-l (Chap. 6)
gray: unit of absorbed energy; 1 joulekg
acceleration due to gravity, in m/s2 or Ws2
height, m
depth of stream flow, in m (Chap. 3)
effective stack height, m (Chap. 19)