Environmental Engineering FOURTH EDITION

462 ENVIRONMENTAL, ENGINEERING

SIW
SL
SPL
ss
sv
SVI
S
S
S

T
TOSCA
TRU
t

tC
1112 -
t
t

uc
USDA
USLE
USPHS
U

V

VP

V

V

V

V

Va

vd

Vi

VO

VP

VR

VS

V'

V

W

WHP

WEPA

significant individual waste

sound level

sound pressure level

suspended solids, in mg/L

sievert; unit of dose equivalent

sludge volume index

hydraulic gradient (Chap. 5)

slope (Chap. 7)

sensation (hearing, touch, etc.)

temperature, in "C

Toxic Substances Control Act

transuranic material or transuranic waste

time, in s or days

critical time, time when minimum DO occurs, in s

radiological half-life of a radionuclide

time of flocculation, in min

retention time, in s or days

unclassifiable (inadequate information)

U.S. Department of Agriculture

universal soil loss equation

U.S. Public Health Service

average wind speed, ds

volume, in m3 or ft3

volume occupied by each particle, in m3 or ft3 (Chap. 7)

interface velocity at solids concentration Ci

velocity of flow, m/s or ft/s, and superficial velocity, dday

or ft/day

velocity of the paddle relative to the fluid, m/s or ft/s

velocity of water through the sand bed, ds or ft/s

velocity of water approaching sand, m/s or ft/s

drift velocity, m/s

inlet gas velocity, ds

settling velocity of a critical particle, in m/s

velocity in a partially full pipe, m/s or ft/s

radial velocity, m/s

settling velocity of any particle, in ds

actual water velocity in soil pores, dday or ft/day

filtrate volume, m3

specific weight, kg/m3 or lb/ft3

water horsepower

Wisconsin Environment Policy Act