Appendix C. List of variables and their definitions for hydrology, water temperature, water chemistry and pesticide indices, SPMD chemistry, and habitat.
TABLE C1. Hydrologic variables 

Variable 
Definition 
cv 
coefficient of variation of crosssectional area over all hours in POR. 
skew 
Skew of crosssectional area over all hours in POR. 
cv_log 
coefficient of variation of hourly crosssectional area values, where crosssectional area values are equal to log(1+crosssectional area) 
coefdisp 
coefficient of dispersion (75th percentile crosssectional area25th percentile crosssectional area)/median crosssectional area 
mean 
mean crosssectional area value or POR 
median 
median (50th percentile) crosssectional area value over POR 
mean_DA 
mean crosssectional area value over POR, divided by drainage area 
med_DA 
median (50th percentile) crosssectional area value over POR, divided by drainage area 
pct_99n 
99th percentile crosssectional area value over POR, divided by median crosssectional area value over POR 
pct_95n 
95th percentile crosssectional area value over POR, divided by median crosssectional area value over POR 
pct_90n 
90th percentile crosssectional area value over POR, divided by median crosssectional area value over POR 
pct_75n 
75th percentile crosssectional area value over POR, divided by median crosssectional area value over POR 
pct_25n 
25th percentile crosssectional area value over POR, divided by median crosssectional area value over POR 
pct_10n 
10th percentile crosssectional area value over POR, divided by median crosssectional area value over POR 
pct_5n 
5th percentile crosssectional area value over POR, divided by median crosssectional area value over POR 
pct_99a 
99th percentile crosssectional area value over POR  Actual value in square meters 
pct_95a 
95th percentile crosssectional area value over POR  Actual value in square meters 
pct_90a 
90th percentile crosssectional area value over POR  Actual value in square meters 
pct_75a 
75th percentile crosssectional area value over POR  Actual value in square meters 
pct_25a 
25th percentile crosssectional area value over POR  Actual value in square meters 
pct_10a 
10th percentile crosssectional area value over POR  Actual value in square meters 
pct_5a 
5th percentile crosssectional area value over POR  Actual value in square meters 
mxh_75 
Maximum duration of high crosssectional area pulses over POR (h); high crosssectional area greater than 75th percentile. 
mxh_90 
Maximum duration of high crosssectional area pulses over POR (h); high crosssectional area greater than 90th percentile. 
mxh_95 
Maximum duration of high crosssectional area pulses over POR (h); high crosssectional area greater than 95th percentile. 
mdh_75 
Median duration of high crosssectional area pulses over POR (h); high crosssectional area greater than 75th percentile. 
mdh_90 
Median duration of high crosssectional area pulses over POR (h); high crosssectional area greater than 90th percentile. 
mdh_95 
Median duration of high crosssectional area pulses over POR (h); high crosssectional area greater than 95th percentile. 
mxl_25 
Maximum duration of low crosssectional area pulses over POR (h); low crosssectional area less than 25th percentile. 
mxl_10 
Maximum duration of low crosssectional area pulses over POR (h); low crosssectional area less than 10th percentile. 
mxl_5 
Maximum duration of low crosssectional area pulses over POR (h); low crosssectional area less than 5th percentile. 
mdl_25 
Median duration of low crosssectional area pulses over POR (h); low crosssectional area less than 25th percentile. 
mdl_10 
Median duration of low crosssectional area pulses over POR (h); low crosssectional area less than 10th percentile. 
mdl_5 
Median duration of low crosssectional area pulses over POR (h); low crosssectional area less than 5th percentile. 
d_pchang 
Sum of the absolute value of the relative change in daily mean crosssectional area, SUM (crosssectional area(t)  crosssectional area(t1)/crosssectional area(t)), 
rb_flash 
Version of RichardsBaker flashiness index, = sum of the absolute values of change in mean daily XA, divided by the sum of the daily mean XAs for the POR; (SUMcrosssectional area(t)crosssectional area(t1)) / (SUM crosssectional area(t)), where 
cum_chng 
Sum of the absolute value of the total rise and fall in crosssectional area over POR 
cum_med 
Sum of the absolute value of the total rise and fall in crosssectional area over POR, divided by median crosssectional area over POR 
mx_trise 
The maximum change in crosssectional area during one rising period 
md_trise 
The median event rise, over the POR, which is the normalizing variable for 'periodr' variables below 
mx_tfall 
The maximum change in crosssectional area during one falling period 
md_tfall 
The median event fall, over the POR, which is the normalizing variable for 'periodf' variables below 
periodr3 
Frequency of rising crosssectional area events, where total rise is greater than or 
periodr5 
Frequency of rising crosssectional area events, where total rise is greater than or 
periodr7 
Frequency of rising crosssectional area events, where total rise is greater than or 
periodr9 
Frequency of rising crosssectional area events, where total rise is greater than or 
periodf3 
Frequency of falling crosssectional area events, where total fall is greater than or equal to 3 times the median total fall over POR (number of falling events) 
periodf5 
Frequency of falling crosssectional area events, where total fall is greater than or 
periodf7 
Frequency of falling crosssectional area events, where total fall is greater than or 
periodf9 
Frequency of falling crosssectional area events, where total fall is greater than or 
mx_durrs 
Maximum duration (number of hours) of consecutive periods of rising crosssectional area over POR 
md_durrs 
Median duration (number of hours) of consecutive periods of rising crosssectional area over POR 
mx_durfl 
Maximum duration (number of hours) of consecutive periods of falling crosssectional area over POR 
md_durfl 
Median duration (number of hours) of consecutive periods of falling crosssectional area over POR 
TABLE C2. Watertemperature variables. 

Variable 
Definition 
AnndDays 
Annual degree days 
SAVE1h 
Average summer temperature based on 1 h measurements 
SMAX1h 
Maximum temperature over summer period based on 1 h measurements 
SMIN1h 
Minimum temperature over summer period based on 1 h measurements 
SRANGE1h 
Range in temperatures over summer period based on 1 h measurements 
SSD1h 
Standard deviation of temperatures over summer period based on 1 h measurements 
SR1hAve 
Average hourly rate of change in temperature (absolute values) over the summer period based on 1 h measurements 
SR1hMax 
Maximum hourly rate of change in temperature (absolute values) over the summer period based on 1 h measurements 
SR1hMin 
Minimum hourly rate of change in temperature (absolute values) over the summer period based on 1 h measurements 
SR1hRNG 
Range in hourly rates of change in temperature (absolute values) over the summer period based on 1 h measurements 
SR1hSD 
Standard deviation in the hourly rate of change in temperature (absolute values) over the summer period based on 1 h measurements 
SR1h1SDn 
Number of summer temperature rate changes that were less than or equal to 1 
SR1h2SDn 
Number of summer temperature rate changes that were greater than 1 standard 
SR1h3SDn 
Number of summer temperature rate changes that were greater than 2 standard 
SR1h4SDn 
Number of summer temperature rate changes that were greater than 3 standard 
SR1h5SDn 
Number of summer temperature rate changes that were greater than 4 standard 
SR1h6SDn 
Number of summer temperature rate changes that were greater than 5 standard 
AVE1h 
Average annual temperature based on 1 h measurements 
MAX1h 
Maximum temperature over annual period based on 1 h measurements 
MIN1h 
Minimum temperature over annual period based on 1 h measurements 
RANGE1h 
Range in temperatures over annual period based on 1 h measurements 
SD1h 
Standard deviation of temperatures over annual period based on 1 h measurements 
R1hAve 
Average hourly rate of change in temperature (absolute values) over an annual period based on 1 h measurements 
R1hMax 
Maximum hourly rate of change in temperature (absolute values) over an annual period based on 1 h measurements 
R1hMin 
Minimum hourly rate of change in temperature (absolute values) over an annual period based on 1 h measurements 
R1hRNG 
Range in hourly rates of change in temperature (absolute values) over an annual period based on 1 h measurements 
R1hSD 
Standard deviation in the hourly rate of change in temperature (absolute values) over an annual period based on 1 h measurements 
R1h1SDn 
Number of temperature rate changes that were less than or equal to 1 standard 
R1h2SDn 
Number of temperature rate changes that were greater than 1 standard deviation and less than or equal to 2 standard deviations of the mean rate of change for the year based on 1 h measurements 
R1h3SDn 
Number of temperature rate changes that were greater than 2 standard deviations 
R1h4SDn 
Number of temperature rate changes that were greater than 3 standard 
R1h5SDn 
Number of temperature rate changes that were greater than 4 standard 
R1h6SDnp 
Number of temperature rate changes that were greater than 5 standard 
TABLE C3. Water chemistry variables and pesticide indices. 

Variable 
Definition 

Field measurements 

High baseflow 

PFINES_H 
Suspended sediment, sieve diameter, percent smaller than 0.063 millimeters: high base flow 

SUSSD_H 
Suspended sediment concentration, milligrams per liter: high base flow 

DISSOX_H 
Dissolved oxygen, water, unfiltered, milligrams per liter: high base flow 

PH_H 
pH, water, unfiltered, field, standard units: high base flow 

COND_H 
Specific conductance, water, unfiltered, microsiemens per centimeter 

ALK_H 
Alkalinity, dissolved, field, incremental titration: high base flow 

CARB_H 
Carbonate, dissolved, field, incremental titration: high base flow 

BICARB_H 
Bicarbonate, dissolved, field, incremental titration: high base flow 

Low baseflow 

PFINES_L 
Suspended sediment, sieve diameter, percent smaller than 0.063 millimeters: high baseflow 

SUSSD_L 
Suspended sediment concentration, milligrams per liter: high baseflow 

DISSOX_L 
Dissolved oxygen, water, unfiltered, milligrams per liter: high baseflow 

PH_L 
pH, water, unfiltered, field, standard units: high baseflow 

COND_L 
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius: high baseflow 

ALK_L 
Alkalinity, dissolved, field, incremental titration: high baseflow 

CARB_L 
Carbonate, dissolved, field, incremental titration: high baseflow 

BICARB_L 
Bicarbonate, dissolved, field, incremental titration: high baseflow 

Nutrients and major ions 

High baseflow 

CHLOR_H 
Chloride, water, filtered, milligrams per liter: high base flow 

SULFA_H 
Sulfate, water, filtered, milligrams per liter: high base flow 

TKN_H 
Ammonia plus organic nitrogen, water, unfiltered, milligrams per liter as nitrogen: high base flow 

AMMON_H 
Ammonia, water, filtered, milligrams per liter as nitrogen: high base flow 

NOX_H 
Nitrite plus nitrate, water, filtered, milligrams per liter as nitrogen: high base flow 

NO2_H 
Nitrite, water, filtered, milligrams per liter as nitrogen: high base flow 

ORTHOP_H 
Orthophosphate, water, filtered, milligrams per liter as phosphorus: high base flow 

PARTN_H 
Particulate nitrogen, suspended in water, milligrams per liter: high base flow 

TOTP_H 
Phosphorus, water, unfiltered, milligrams per liter: high base flow 

TPARC_H 
Total nitrogen, water, unfiltered, milligrams per liter: high base flow 

PINORC_H 
Inorganic carbon, suspended sediment, total, milligrams per liter: high base flow 

PORGC_H 
Organic carbon, suspended sediment, total, milligrams per liter: high base flow 

DISORC_H 
Organic carbon, water, filtered, milligrams per liter: high base flow 

NO3_H 
Nitrate, water, filtered, milligrams per liter as nitrogen: high base flow 

TOTN_H 
Total nitrogen, water, unfiltered, milligrams per liter: high base flow 

Low baseflow 

CHLOR_L 
Chloride, water, filtered, milligrams per liter: low baseflow 

SULFA_L 
Sulfate, water, filtered, milligrams per liter: low baseflow 

TKN_L 
Ammonia plus organic nitrogen, water, unfiltered, milligrams per liter as nitrogen: low baseflow 

AMMON_L 
Ammonia, water, filtered, milligrams per liter as nitrogen: low baseflow 

NOX_L 
Nitrite plus nitrate, water, filtered, milligrams per liter as nitrogen: low baseflow 

NO2_L 
Nitrite, water, filtered, milligrams per liter as nitrogen: low baseflow 

ORTHOP_L 
Orthophosphate, water, filtered, milligrams per liter as phosphorus: low baselow 

PARTN_L 
Particulate nitrogen, suspended in water, milligrams per liter: low baseflow 

TOTP_L 
Phosphorus, water, unfiltered, milligrams per liter: low baseflow 

TPARC_L 
Total nitrogen, water, unfiltered, milligrams per liter: low baseflow 

PINORC_L 
Inorganic carbon, suspended sediment, total, milligrams per liter: low baseflow 

PORGC_L 
Organic carbon, suspended sediment, total, milligrams per liter: low baseflow 

DISORC_L 
Organic carbon, water, filtered, milligrams per liter: low baseflow 

NO3_L 
Nitrate, water, filtered, milligrams per liter as nitrogen: low baseflow 

TOTN_L 
Total nitrogen, water, unfiltered, milligrams per liter: low baseflow 

Pesticides High baseflow 

CHLIS_H 
04040 2chloro4isopropylamino6aminostriazine, water, filtered, recoverable, micrograms per liter, high baseflow 

ETHYL_H 
61620 2ethyl6methylaniline, water, filtered, recoverable, micrograms per liter, high baseflow 

DICHL2_H 
38775 Dichlorvos, water, filtered, recoverable, micrograms per liter, high baseflow 

CHLME_H 
61633 4chloro2methylphenol, water, filtered, recoverable, micrograms per liter, high baseflow 

ACETO_H 
49260 Acetochlor, water, filtered, recoverable, micrograms per liter, high baseflow 

ALACH_H 
46342 Alachlor, water, filtered, recoverable, micrograms per liter, high baseflow 

ATRAZ_H 
39632 Atrazine, water, filtered, recoverable, micrograms per liter, high baseflow 

BENFL_H 
82673 Benfluralin, water, filtered (0.7 micron glass fiber filter), recoverable, micrograms per liter, high baseflow 

CARBA_H 
82680 Carbaryl, water, filtered (0.7 micron glass fiber filter), recoverable, micrograms per liter, high baseflow 

CHLOP_H 
38933 Chlorpyrifos, water, filtered, recoverable, micrograms per liter, high baseflow 

DCPA_H 
82682 DCPA, water, filtered (0.7 micron glass fiber filter), recoverable, micrograms per liter, high baseflow 

DESFI_H 
62170 Desulfinyl fipronil, water, filtered, recoverable, micrograms per liter, high baseflow 

DIAZO_H 
61638 Diazinon oxygen analog, water, filtered, recoverable, micrograms per liter, high baseflow 

DIAZI_H 
39572 Diazinon, water, filtered, recoverable, micrograms per liter, high baseflow 

DIELD_H 
39381 Dieldrin, water, filtered, recoverable, micrograms per liter, high baseflow 

FENSN_H 
61645 Fenamiphos sulfone, water, filtered, recoverable, micrograms per liter, high baseflow 

FENSX_H 
61646 Fenamiphos sulfoxide, water, filtered, recoverable, micrograms per liter, high baseflow 

FENAM_H 
61591 Fenamiphos, water, filtered, recoverable, micrograms per liter, high baseflow 

DESAM_H 
62169 Desulfinylfipronil amide, water, filtered, recoverable, micrograms per liter, high baseflow 

FIPSD_H 
62167 Fipronil sulfide, water, filtered, recoverable, micrograms per liter, high baseflow 

FIPSN_H 
62168 Fipronil sulfone, water, filtered, recoverable, micrograms per liter, high baseflow 

FIPRO_H 
62166 Fipronil, water, filtered, recoverable, micrograms per liter, high baseflow 

HEXAZ_H 
04025 Hexazinone, water, filtered, recoverable, micrograms per liter, high baseflow 

MALAT_H 
39532 Malathion, water, filtered, recoverable, micrograms per liter, high baseflow 

METAL_H 
61596 Metalaxyl, water, filtered, recoverable, micrograms per liter, high baseflow 

METOL_H 
39415 Metolachlor, water, filtered, recoverable, micrograms per liter, high baseflow 

METRI_H 
82630 Metribuzin, water, filtered, recoverable, micrograms per liter, high baseflow 

MYCLO_H 
61599 Myclobutanil, water, filtered, recoverable, micrograms per liter, high baseflow 

PENDI_H 
82683 Pendimethalin, water, filtered (0.7 micron glass fiber filter), recoverable, micrograms per liter, high baseflow 

PROME_H 
04037 Prometon, water, filtered, recoverable, micrograms per liter, high baseflow 

PROMY_H 
04036 Prometryn, water, filtered, recoverable, micrograms per liter, high baseflow 

PROPY_H 
82676 Propyzamide, water, filtered (0.7 micron glass fiber filter), recoverable, micrograms per liter, high baseflow 

SIMAZ_H 
04035 Simazine, water, filtered, recoverable, micrograms per liter, high baseflow 

TEBUT_H 
82670 Tebuthiuron, water, filtered (0.7 micron glass fiber filter), recoverable, micrograms per liter, high baseflow 

TERBU_H 
04022 Terbuthylazine, water, filtered, recoverable, micrograms per liter, high baseflow 

TRIFL_H 
82661 Trifluralin, water, filtered (0.7 micron glass fiber filter), recoverable, micrograms per liter, high baseflow 

TPCONC_H 
Total pesticide (calculated) (ug/L), high baseflow 

NUMP_H 
Number of pesticide detections, high baseflow 

THCONC_H 
Total herbicide (calculated) (ug/L), high baseflow 

NUMH_H 
Number of herbicide detections, high baseflow 

TICONC_H 
Total insecticide (calculated) (ug/L), high baseflow 

NUMI_H 
Number of insecticide detections, high baseflow 

PTICD_H 
Pesticide toxicity index (PTI) cladocerans, high baseflow 

PTIIN_H 
Pesticide toxicity index (PTI) benthic inverts, high baseflow 

PTIFS_H 
Pesticide toxicity index (PTI) freshwater fish, high baseflow 

PTICD1_H 
Pesticide toxicity index (PTI) cladocerans, high baseflow 

PTIIN1_H 
Pesticide toxicity index (PTI) benthic inverts, high baseflow 

PTIFS1_H 
Pesticide toxicity index (PTI) freshwater fish, high baseflow 

Low baseflow 

CHLDI_L 
61618 2chloro2',6'diethylacetanilide, water, filtered, recoverable, micrograms per liter, low baseflow 

CHLIS_L 
04040 2chloro4isopropylamino6aminostriazine, water, filtered, recoverable, micrograms per liter, low baseflow 

DICHL2_L 
61625 3,4dichloroaniline, water, filtered, recoverable, micrograms per liter, low baseflow 

CHLME_L 
61633 4chloro2methylphenol, water, filtered, recoverable, micrograms per liter, low baseflow 

ACETO_L 
49260 Acetochlor, water, filtered, recoverable, micrograms per liter, low baseflow 

ALACH_L 
46342 Alachlor, water, filtered, recoverable, micrograms per liter, low baseflow 

ATRAZ_L 
39632 Atrazine, water, filtered, recoverable, micrograms per liter, low baseflow 

AZMET_L 
82686 Azinphosmethyl, water, filtered (0.7 micron glass fiber filter), recoverable, micrograms per liter, low baseflow 

CARBA_L 
82680 Carbaryl, water, filtered (0.7 micron glass fiber filter), recoverable, micrograms per liter, low baseflow 

CHLOP_L 
38933 Chlorpyrifos, water, filtered, recoverable, micrograms per liter, low baseflow 

DCPA_L 
82682 DCPA, water, filtered (0.7 micron glass fiber filter), recoverable, micrograms per liter, low baseflow 

DESFI_L 
62170 Desulfinyl fipronil, water, filtered, recoverable, micrograms per liter, low baseflow 

DIAZO_L 
61638 Diazinon oxygen analog, water, filtered, recoverable, micrograms per liter, low baseflow 

DIAZI_L 
39572 Diazinon, water, filtered, recoverable, micrograms per liter, low baseflow 

DIELD_L 
39381 Dieldrin, water, filtered, recoverable, micrograms per liter, low baseflow 

DIMET_L 
82662 Dimethoate, water, filtered (0.7 micron glass fiber filter), recoverable, micrograms per liter, low baseflow 

DESAM_L 
62169 Desulfinylfipronil amide, water, filtered, recoverable, micrograms per liter, low baseflow 

FIPSD_L 
62167 Fipronil sulfide, water, filtered, recoverable, micrograms per liter, low baseflow 

FIPSN_L 
62168 Fipronil sulfone, water, filtered, recoverable, micrograms per liter, low baseflow 

FIPRO_L 
62166 Fipronil, water, filtered, recoverable, micrograms per liter, low baseflow 

HEXAZ_L 
04025 Hexazinone, water, filtered, recoverable, micrograms per liter, low baseflow 

MALAO_L 
61652 Malaoxon, water, filtered, recoverable, micrograms per liter, low baseflow 

MALAT_L 
39532 Malathion, water, filtered, recoverable, micrograms per liter, low baseflow 

METAL_L 
61596 Metalaxyl, water, filtered, recoverable, micrograms per liter, low baseflow 

METOL_L 
39415 Metolachlor, water, filtered, recoverable, micrograms per liter, low baseflow 

METRI_L 
82630 Metribuzin, water, filtered, recoverable, micrograms per liter, low baseflow 

MYCLO_L 
61599 Myclobutanil, water, filtered, recoverable, micrograms per liter, low baseflow 

PENDI_L 
82683 Pendimethalin, water, filtered (0.7 micron glass fiber filter), recoverable, micrograms per liter, low baseflow 

PROME_L 
04037 Prometon, water, filtered, recoverable, micrograms per liter, low baseflow 

PROMY_L 
04036 Prometryn, water, filtered, recoverable, micrograms per liter, low baseflow 

PROPY_L 
82676 Propyzamide, water, filtered (0.7 micron glass fiber filter), recoverable, micrograms per liter, low baseflow 

SIMAZ_L 
04035 Simazine, water, filtered, recoverable, micrograms per liter, low baseflow 

TEBUT_L 
82670 Tebuthiuron, water, filtered (0.7 micron glass fiber filter), recoverable, micrograms per liter, low baseflow 

TERBU_L 
04022 Terbuthylazine, water, filtered, recoverable, micrograms per liter, low baseflow 

TRIFL_L 
82661 Trifluralin, water, filtered (0.7 micron glass fiber filter), recoverable, micrograms per liter, low baseflow 

DICHL_L 
38775 Dichlorvos, water, filtered, recoverable, micrograms per liter, low baseflow 

TPCONC_L 
Total pesticide (calculated) (ug/L), low baseflow 

NUMP_L 
Number of pesticide detections, low baseflow 

THCONC_L 
Total herbicide (calculated) (ug/L), low baseflow 

NUMH_L 
Number of herbicide detections, low baseflow 

TICONC_L 
Total insecticide (calculated) (ug/L), low baseflow 

NUMI_L 
Number of insecticide detections, low baseflow 

PTICD_L 
Pesticide toxicity index (PTI) cladocerans, low baseflow 

PTIIN_L 
Pesticide toxicity index (PTI) benthic inverts, low baseflow 

PTIFS_L 
Pesticide toxicity index (PTI) freshwater fish, low baseflow 

PTICD1_L 
Pesticide toxicity index (PTI) cladocerans, low baseflow 

PTIIN1_L 
Pesticide toxicity index (PTI) benthic inverts, low baseflow 

PTIFS1_L 
Pesticide toxicity index (PTI) freshwater fish, low baseflow 
TABLE C4. SPMD chemistry. 

Variable 
Definition 
TEQF 
P450RGS (TEQs  picograms 2,3,7,8 TCDD/ml SPMD extract, Sensitive, 
EC50F 
Microtox® (mgSPMD/ml solvent, Toxicity, EC50 for mixtures) 
S_FLUOR 
Fluorene (86737, polycyclic aromatic hydrocarbon) 
S_ANTHRC 
Anthracene (120127, polycyclic aromatic hydrocarbon) 
S_PHENA 
Phenanthrene (85018, polycyclic aromatic hydrocarbon) 
SM9HFLUR 
Methyl9Hfluorene* (1730376, polycyclic aromatic hydrocarbon) 
S_TTMNAP 
1,2,3,4tetramethylnaphthalene (103203583, polycyclic aromatic hydrocarbon) 
S_MANTH 
Methyl anthracene (610480, polycyclic aromatic hydrocarbon) 
S_FLUORA 
Fluoranthene (206440, polycyclic aromatic hydrocarbon) 
S_PYRE 
Pyrene (129000, polycyclic aromatic hydrocarbon) 
S_BZPHEN 
Benzophenanthrene* (195197, polycyclic aromatic hydrocarbon) 
S_BAPYR 
Benzo(a)pyrene (50328, polycyclic aromatic hydrocarbon) 
SDBZTHIO 
Dibenzothiophene (132650, s  polycyclic aromatic hydrocarbon) 
S_BZCACR 
Benz[c]acridine (225514, n  polycyclic aromatic hydrocarbon) 
S_MDBFUR 
Methyl dibenzofuran* (60826622, furan) 
S_BZNFUR 
Benzo(b)naphtho[2,3d] furan (243425, furan) 
S_TOTPCB 
Total PCBs 
S_CHLOP 
Chlorpyrifos (2921882, organophosphate insecticide) 
S_CHLOR 
Total chlordane (cis + trans) 
S_DIELD 
Dieldrin (60571, organochlorine insecticide) 
S_DIAZ 
Diazinon (333415, organothiophosphate insecticide) 
S_BENFL 
Benfluralin (1861401, dinitroaniline herbicide) 
S_DCPA 
Dacthal (DCPA) (1861321, chlorobenzoic acid ester herbicide) 
S_TRIFL 
Trifluralin (1582098, dinitroaniline herbicide) 
S_TOTBDE 
Total BDE (fire retardants) 
S_AHTN 
Acetylhexamethyltetrahydronaphthalene ( AHTN) (21145777, fragrance) 
S_HHCB 
Hexahydrohexamethylcyclopentabenzopyran (HHCB) (1222055, fragrance) 
S_TRICL 
Triclosan (3380345, antimicrobial / disinfectant) 
SDETECTS 
Number of compounds detected 
TABLE C5. Habitat variables. 

Variable 
Definition 
BnkErosP 
Percent occurrence of bank erosion 
BnkVgCAv 
Mean percent bank vegetative cover 
BnkVgCMx 
Maximum percent bank vegetative cover 
BnkVgCMn 
Minimum percent bank vegetative cover 
BFArea 
Bankfull area, average 
BFAreaNP 
Bankfull area, average, pool transects excluded 
BFArNPDA 
Bankfull area, average, pool transects excluded, normalized by drainage area 
BFDpthAv 
Mean bankfull depth (m) 
BFDpthMx 
Maximum bankfull depth (m) 
BFDpthMn 
Minimum bankfull depth (m) 
BFDpNPDA 
Bankfull depth, average, pool transects excluded, normalized by drainage area 
BFShear 
Bankfull shear stress, average 
BFWdthAv 
Mean bankfull channel width (m) 
BFWdDpAv 
Mean bankfullchannel widthdepth ratio for reach 
BFWdDpMx 
Maximum bankfull width / bankfull depth ratio 
BFWdDpMn 
Minimum bankfull width / bankfull depth ratio 
BFWdthMx 
Maximum bankfull width (m) 
BFWdthMn 
Minimum bankfull width (m) 
BFWdNPDA 
Bankfull width, average, pool transects excluded, normalized by drainage area 
CnClBnAv 
Mean percent canopy closure, bank readings 
CnClBnMx 
Maximum percent canopy closure, bank measurements 
ChanStab 
Bankfull area, average/WetXAreaAvg 
DepthAvg 
Mean wetted channel depth (m) 
DepthCv 
Coefficient of variation of wetted channel depth (%) 
DepthMax 
Maximum wetted channel depth (m) 
DepthMin 
Minimum wetted channel depth (m) 
DSub10P 
Relative proportion (percent occurrence) of transect points where the 
DSub1P 
Relative proportion (percent occurrence) of transect points where the 
DSub2P 
Relative proportion (percent occurrence) of transect points where the 
DSub3P 
Relative proportion (percent occurrence) of transect points where the 
DSub4P 
Relative proportion (percent occurrence) of transect points where the 
DSub5P 
Relative proportion (percent occurrence) of transect points where the 
DSub6P 
Relative proportion (percent occurrence) of transect points where the 
DSub7P 
Relative proportion (percent occurrence) of transect points where the 
DSub8P 
Relative proportion (percent occurrence) of transect points where the 
DSub9P 
Relative proportion (percent occurrence) of transect points where the 
DSBFD50 
Critical particle size (d50) potentially mobilized at bankfull flow 
DSubD50 
Dominant substrate size, 50th percentile of cumulative frequency 
DSubD84 
Dominant substrate size, 84th percentile of cumulative frequency 
DSubFine 
Dominant substrate size, percent silt and sand (substrate categories 2 and 3) 
DSubGr46 
Dominant substrate size, percent gravel (substrate categories 4 and 6) 
DSubCb79 
Dominant substrate size, percent cobble (substrate categories 7 and 9) 
DSubStab 
Dominant substrate size, 50th percentile of cumulative frequency/critical 
EmbedPAv 
Mean percent embeddedness 
EmbedPMx 
Maximum percent embeddedness 
EmbedPMn 
Minimum percent embeddedness 
FloStbAv 
Mean flow stability ratio 
FloStbMx 
Maximum flow stability ratio 
FloStbMn 
Minimum flow stability ratio 
Froude 
Froude number 
GCUIndex 
Percent pools/percent riffles 
GCUTypPP 
Relative proportion of the total length of all geomorphic channel units that are comprised of pools (%) 
GCUTypRP 
Relative proportion of the total length of all geomorphic channel units that are comprised riffles (%) 
GCUTyRuP 
Relative proportion of the total length of all geomorphic channel units that are comprised of runs (%) 
HydRadAv 
Mean wetted channel hydraulic radius 
OCanAgAv 
Mean open canopy angle 
OCanAgCv 
Coefficient of variation of open canopy angle (%) 
OCanAngx 
Maximum open canopy angle 
OCanAgMn 
Minimum open canopy angle 
RchArea 
Wetted channel surface area of reach = reach length * mean wetted channel width (m^{2}) 
RchVol 
Reach wetted channel volume = reach length * mean channel width * mean depth (m^{3}) 
RchVolDA 
Reach volume normalized by drainage area 
RipLUDis 
Disturbed riparian land use (reach) 
SiltCovP 
Percent occurrence of transect points where silt layer was observed on streambed 
VelocAvg 
Mean flow velocity (m/sec) 
VelocCv 
Coefficient of variation of flow velocity (%) 
VelocMax 
Maximum stream flow velocity (m/sec) 
VelocMin 
Minimum velocity (m/sec) 
WatSrfGr 
Reach watersurface gradient (dimensionless) 
WetPerAv 
Mean perimeter of wetted channel (m) 
WetPerMx 
Maximum wetted channel perimeter (m) 
WetPerMn 
Minimum wetted channel perimeter (m) 
WetShpAv 
Mean wetted channel shape 
WetShpMx 
Minimum wetted channel shape 
WetShpMn 
Maximum wetted channel shape 
WetXAAv 
Mean crosssectional are of wetted channel (m^{2}) 
WetXAMx 
Maximum wetted cross sectional area of channel (m^{2}) 
WetXAMn 
Minimum wetted cross sectional area of channel (m^{2}) 
WdtDphAv 
Mean wettedchannel widthdepth ratio of reach 
WdtDphMx 
Maximum wetted channel widthdepth ratio 
WdtDphMn 
Minimum wetted channel widthdepth ratio 
WidthWetAvg 
Mean wetted channel width (m) 
WidthWetCv 
Coefficient of variability (CV) wetted width 
WidthWetMax 
Maximum wetted channel width (m) 
WidthWetMin 
Minimum wetted channel width (m) 