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, filt 