Table 1.

Comparison of the Rivers Camel and Conwy catchment characteristics, data summarised from Coxon et al. (2020). Historical data covers the period 1st October 1970 – 30th September 2015. Camel catchment data pertains to the 49001 – Camel at Denby gauge (NERC, 2020b) situated 1.89 km up stream of the upstream model boundary (it does not include the catchments/discharges of the rivers Allen, Polmorfa, Amble and Petherick that were also modelled). Conwy catchment data pertains to the 66011 – Conwy at Cwmlanerch gauge (NERC, 2020b) situated 5.65 km upstream of the upstream model boundary. ∗Negative seasonality index implies precipitation peaks in winter and values close to zero indicate uniform precipitation through the year.

Characteristic	Camel	Conwy
Geography and Topology
Entire Area Catchment Area (km2)	413	574
Upper catchment area - above upstream model limit (km2)	210	340
Max Elevation (m)	411	1050
Median Elevation (m)	162	330
Catchment mean drainage path slope	87.9	169.7
Climatic (historical)
Mean daily precipitation (mmd−1)	3.77	5.83
Frequency of dry (<1 mm d−1) days (d yr−1)	188	162
Average duration of dry periods (d)	3.55	3.17
Freq of high-precipitation ($\ge$ 5 times mean daily precipitation) days (d yr−1)	14.02	12.53
Average duration of high-precipitation days periods (d)	1.09	1.13
Seasonality Index of precipitation∗	-0.21	-0.26
Hydrologic (historical)
Mean daily discharge (m3s−1)	2.44	4.82
Q5 – 5% flow percentile (m3s−1)	0.40	0.34
Q95 – 95% flow percentile (m3s−1)	7.11	17.65
Runoff ratio of mean daily discharge to mean daily precipitation	0.65	0.83
Slope of flow duration curves between log transformed 33rd and 66th streamflow percentiles; higher values are generally associated with basins with steeper topography and lower permeability (Yadav et al., 2007)	2.66	3.37
Ratio of mean daily baseflow to daily discharge (based on Ladson et al., 2013 hydrograph separation method)	0.64	0.41
Number of high flow days per year (>9 times the median daily flow)	1.22	13.49