Sites | Density | IFL | Group |
|---|
A = Rock creek | 0.12 | 0.18 | 1 |
B = Driver creek | 0.00 | 0.00 | 1 |
C = Cedar creek | 0.04 | 0.00 | 1 |
D = Sis hollow | 0.00 | 0.00 | 1 |
A = East fork | 2.32 | 2.35 | 2 |
B = Sunnyside creek | 3.64 | 0.31 | 2 |
C = Hogans creek | 1.77 | 1.7 | 2 |
D = Black fork | 0.69 | 1.3 | 2 |
F-value | 11.30 | 10.17 | Â |
Probability | 0.015a
| 0.019a
| Â |
- Sites are geographically depicted in Fig. 1; Density is the number of unconventional natural gas (UNG) wells within a km2 of each site; Inverse Flow Length (IFL) represents the length of flow from each well to the stream channel, corrected for slope, and calculated for wells upstream of each sampling location using the flow length tool in ArcGIS [19]. The inverse of each flow length was summed across all wells for each catchment area such that wells more proximal had a higher value and thus a greater potential effect; Group is based on threshold values of > =0.25 wells/km2 and IFL >0.05, with Group 1 indicating presence within a ‘minimally impacted catchment zone’ (=MICZ), whereas Group 2 are within a ‘potentially impacted catchment zone’ (PICZ) with greater density of, and proximimty to, UNG wells; F-value is the F-statistic recorded in a 1-way analysis of variance (ANOVA) by Group [i.e., = MICZ (1) versus PICZ (2)] as derived in R [41]. Probability represents the statistical significance of each F-value as determined by Bonferroni adjusted alpha = 0.025, with significance indicated by ana
