No. | River/gauging sites | Catchment area | Mean specific discharge (dm3 · s−1 · km−2) | Mean flow (m3 · s−1) | Minimum flow (m3 · s−1) (year) | Maximum flow (m3 · s−1) (year) | Standard deviation (m3 · s−1) | Statistics MK test | |
---|---|---|---|---|---|---|---|---|---|
1 | Skrwa Prawa/Parzeń | 1490.3 | 4.19 | 6.24 | 2.13 (2016) | 11.37 (2002) | 2.49 | −0.057 | 0.9549 |
2 | Zgłowiączka/Włocławek Ruda | 1491.8 | 2.40 | 3.59 | 0.64 (2016) | 9.98 (1980) | 1.98 | −1.036 | 0.3002 |
3 | Drwęca/Elgiszewo | 5019.5 | 5.56 | 27.92 | 13.08 (2015) | 42.84 (1982) | 6.51 | −0.719 | 0.4721 |
4 | Brda/Tuchola | 2477.2 | 7.87 | 19.50 | 14.22 (1992) | 25.93 (2011) | 2.42 | −0.368 | 0.7129 |
5 | Wda/Czarna Woda | 827.6 | 7.57 | 6.27 | 4.33 (1992) | 9.08 (1962) | 1.02 | −1.687 | 0.0915 |
6 | Osa/Rogoźno | 1135.1 | 3.93 | 4.47 | 1.36 (2015) | 9.17 (1982) | 1.78 | −1.908 | 0.0564 |
7 | Wierzyca/Brody Pomorskie | 1543.4 | 5.64 | 8.70 | 5.40 (1992) | 12.87 (1982) | 1.72 | −1.574 | 0.1155 |
River | Period | SSI-12 0.0 ÷ −1.0 | SSI-12 −1.0 ÷ −1.5 | SSI-12 −1.5 ÷ −2.0 | SSI-12 <−2.0 | Min. value of SSI-12 | Mean value of SSI-12 | Total duration [months] | C-12 (mean) | S-12 (mean) | W-12 (mean) |
---|---|---|---|---|---|---|---|---|---|---|---|
1990–1994 | |||||||||||
Skrwa Prawa | Dec 1990–Dec 1994 | 17 | 21 | 5 | 6 | −2.07 | −1.23 | 49 | −30.59 | −33.78 | 159.57 |
Zgłowiączka | Jan 1990–Feb 1994 | 3 | 23 | 18 | 6 | −2.08 | −1.51 | 50 | −25.76 | −31.56 | 156.88 |
Drwęca | – | – | – | – | – | – | – | – | – | – | – |
Brda | Feb 1990–Oct 1995 | 24 | 13 | 18 | 14 | −2.45 | −1.33 | 69 | −14.14 | −20.75 | 158.29 |
Wda | Sep 1991–Sep 1995 | 19 | 12 | 6 | 12 | −2.35 | −1.23 | 49 | −15.16 | −13.39 | 151.06 |
Osa | Jan 1990–Feb 1994 | 35 | 7 | 8 | 0 | −1.68 | −0.90 | 50 | −25.76 | −31.56 | 156.88 |
Wierzyca | Jan 1990–Mar 1994 | 26 | 11 | 6 | 8 | −2.26 | −1.11 | 51 | −23.41 | −30.18 | 156.10 |
2014–2017* | |||||||||||
Skrwa Prawa | Jan 2015–Sep 2017 | 5 | 4 | 13 | 11 | −2.26 | −1.63 | 33 | −64.85 | 28.15 | 138.51 |
Zgłowiączka | Jan 2013–Jan 2018 | 26 | 10 | 7 | 18 | −2.48 | −1.30 | 61 | −36.98 | 29.93 | 122.92 |
Drwęca | Apr 2014–Oct 2017 | 6 | 6 | 9 | 22 | −2.71 | −1.86 | 43 | −51.04 | 34.02 | 129.74 |
Brda | Jun 2014–Aug 2017 | 8 | 8 | 10 | 13 | −2.43 | −1.58 | 39 | −55.28 | 35.74 | 130.46 |
Wda | Jun 2014–Sep 2017 | 7 | 10 | 11 | 12 | −2.33 | −1.54 | 40 | −54.38 | 35.00 | 130.25 |
Osa | May 2014–Oct 2017 | 7 | 7 | 8 | 20 | −2.59 | −1.78 | 42 | −52.38 | 33.79 | 130.35 |
Wierzyca | May 2014–Apr 2017 | 4 | 9 | 6 | 17 | −2.46 | −1.74 | 36 | −52.16 | 40.41 | 128.47 |
No. | River | SSI-12/C-12 | SSI-12/S-12 | SSI-12/W-12 | |||
---|---|---|---|---|---|---|---|
Spearman's Corelation Coefficient | Spearman's Corelation Coefficient | Spearman's Corelation Coefficient | |||||
1 | Skrwa Prawa | 0.03 | 0.6677 | ||||
2 | Zgłowiączka | ||||||
3 | Drwęca | 0.1034 | |||||
4 | Brda | 0.08 | 0.2605 | ||||
5 | Wda | 0.2494 | 0.03 | 0.6647 | |||
6 | Osa | 0.1644 | |||||
7 | Wierzyca | 0.7747 |
No. | Circulation index | Mean | Maximum (year) | Minimum (year) | Standard deviation | Statistics MK test | |
---|---|---|---|---|---|---|---|
1 | W | 114.6 | 226 (1983) | −48 (1960) | 54.4 | 2.735 | |
2 | S | 0.7 | 88 (1960) | −57 (1997) | 31.7 | −0.170 | 0.8651 |
3 | C | − 24.7 | 110 (2001) | −178 (1959) | 54.6 | 0.532 | 0.5945 |
No. | River | Total number of dry periods | Total number of months | Max. number of months during one dry period | Min. number of months during one dry period |
---|---|---|---|---|---|
1 | Skrwa Prawa | 9 | 196 | 49 | 3 |
2 | Zgłowiączka | 6 | 170 | 61 | 8 |
3 | Drwęca | 7 | 163 | 43 | 11 |
4 | Brda | 8 | 203 | 69 | 6 |
5 | Wda | 6 | 180 | 49 | 13 |
6 | Osa | 9 | 217 | 50 | 4 |
7 | Wierzyca | 10 | 194 | 51 | 3 |