Table 1.

Length and density of different categories of channels in our study regions across Sweden. The regions are roughly oriented from north to south, see Fig. 1 for specific locations. The total length includes both natural channels and ditches. The straightened channels are included with the ditches

Study regions (Northern or Southern, i.e., N or S)	Latitude	Total area (km2)	Prehistoric channels (with stream initiation threshold of 6.3 ha)		Current channels
			Density—natural channel (km/km2)	Total channel length (km)	Density—natural channel (km/km2)	Density—agricultural ditch (km/km2)	Density—forest ditch (km/km2)	Density—road ditch (km/km2)	Density—all ditches (km/km2)	Density—all channels (km/km2)	Total channel length (km)
Region 1 (N)	65° 52′ 59″ N	37.50	1.38	51.77	0.19	0.08	4.13	1.14	5.35	5.55	207.95
Region 2 (N)	65° 43′ 46″ N	37.50	1.53	57.41	0.42	0.00	2.69	0.44	3.13	3.54	132.92
Region 3 (N)	65° 17′ 47″ N	37.50	1.61	60.43	0.53	0.00	6.54	0.69	7.23	7.76	290.96
Region 4 (N)	64° 15′ 6″ N	68.00	1.64	111.44	0.97	0.15	2.34	1.58	4.07	5.05	343.10
Region 5 (N)	62° 11′ 32″ N	106.25	1.10	116.60	0.73	0.46	1.09	1.19	2.73	3.46	367.33
Region 6 (S)	59° 6′ 35″ N	6.25	1.24	7.74	0.46	0.79	3.79	2.37	6.95	7.40	46.28
Region 7 (S)	57° 23′ 56″ N	31.25	1.08	33.89	0.24	0.26	2.52	1.74	4.52	4.77	148.94
Region 8 (S)	57° 01′ 43″ N	37.50	1.26	47.43	0.89	0.11	2.44	1.17	3.72	4.61	172.80
Region 9 (S)	56° 17′ 41″ N	12.50	1.04	12.95	0.30	0.48	0.63	0.19	1.31	1.61	20.11
Region 10 (S)	56° 02′ 55″ N	18.75	0.93	17.48	0.26	0.36	1.63	0.78	2.78	3.03	56.87
Region 11 (S)	55° 53′ 48″ N	37.50	1.79	67.31	0.25	0.58	2.50	1.15	4.23	4.48	168.16
Average density (N)			1.45		0.57	0.14	3.36	1.01	4.50	5.07
Average density (S)			1.23		0.40	0.43	2.25	1.23	3.92	4.32
Average density (All)			1.33		0.48	0.30	2.75	1.13	4.18	4.66
Grand total				584.44							1955.43