Efficiency of a macroroughness block ramp in reducing the impact of low-head dams on riverine fish dispersion | Knowledge and Management of Aquatic Ecosystems

Biological conservation, ecosystems restoration and ecological engineering

Open Access

Table 2

Different passage times for barbel, chub, gudgeon, spirlin and all other species together.

		Time for					Time for

		Approach + entrance Tapp	Ramp passage Tpas (hh:mm:ss)	Overall passage Tall			Approach + entrance Tapp	Ramp passage Tpas (hh:mm:ss)	Overall passage Tall
Barbel	Nb of attemps	51	35	35	Spirlin	Nb of attemps	38	16	16
	Min	0:02:07	0:04:28	0:17:48		Min	0:03:47	0:12:28	0:16:15
	25th percentile	0:27:31	0:19:00	1:03:12		25th percentile	0:48:10	1:03:09	2:26:27
	Median	0:50:41	2:11:18	4:28:23		Median	2:01:09	2:18:25	23:29:48
	75th percentile	6:51:55	7:22:23	44:03:20		75th percentile	13:16:25	21:24:51	41:40:49
Chub	Nb of attemps	116	101	101	Other species	Nb of attemps	15	14	14
	Min	0:02:26	0:03:44	0:11:13		Min	0:03:18	0:04:39	0:12:40
	25th percentile	0:22:09	0:10:07	0:35:55		25th percentile	0:09:43	0:10:26	0:35:19
	Median	1:06:23	0:17:39	1:34:21		Median	0:20:55	0:29:47	1:34:53
	75th percentile	8:28:22	0:29:27	13:56:00		75th percentile	1:46:48	0:52:57	3:13:56
Gudgeon	Nb of attemps	34	25	25
	Min	0:05:05	0:09:19	0:14:47
	25th percentile	0:11:26	0:30:18	0:56:18
	Median	1:38:48	1:02:25	3:35:45
	75th percentile	31:15:51	1:46:24	35:43:01

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