Hydro-meteorological reconstruction and geomorphological  impact assessment of the October 2018 catastrophic flash  flood at Sant Llorenç, Mallorca (Spain)

Lorenzo-Lacruz, Jorge; Amengual, Arnau; Garcia, Celso; Morán-Tejeda, Enrique; Homar, Víctor; Maimó-Far, Aina; Hermoso, Alejandro; Ramis, Climent; Romero, Romualdo

doi:10.5194/nhess-19-2597-2019

Articles | Volume 19, issue 11

https://doi.org/10.5194/nhess-19-2597-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

Hydroclimatic extremes and impacts at catchment to regional...

https://doi.org/10.5194/nhess-19-2597-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 19, issue 11

Research article

|

20 Nov 2019

Research article |

| 20 Nov 2019

Hydro-meteorological reconstruction and geomorphological impact assessment of the October 2018 catastrophic flash flood at Sant Llorenç, Mallorca (Spain)

Jorge Lorenzo-Lacruz, Arnau Amengual, Celso Garcia, Enrique Morán-Tejeda, Víctor Homar, Aina Maimó-Far, Alejandro Hermoso, Climent Ramis, and Romualdo Romero

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Nov 2019	166	62	0	228
Dec 2019	199	56	3	258
Jan 2020	130	48	8	186
Feb 2020	62	21	1	84
Mar 2020	53	22	0	75
Apr 2020	38	22	3	63
May 2020	35	24	1	60
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Jan 2022	44	41	0	85
Feb 2022	48	27	4	79
Mar 2022	22	28	0	50
Apr 2022	28	38	3	69
May 2022	37	51	1	89
Jun 2022	36	35	2	73
Jul 2022	61	24	0	85
Aug 2022	147	15	0	162
Sep 2022	53	12	1	66
Oct 2022	61	12	1	74
Nov 2022	38	21	0	59
Dec 2022	17	15	0	32
Jan 2023	42	14	2	58
Feb 2023	34	17	1	52
Mar 2023	50	24	0	74
Apr 2023	30	21	0	51
May 2023	27	12	5	44
Jun 2023	26	10	1	37
Jul 2023	15	18	1	34
Aug 2023	20	14	2	36
Sep 2023	23	14	1	38
Oct 2023	28	22	3	53
Nov 2023	20	5	0	25
Dec 2023	14	12	0	26
Jan 2024	32	6	1	39
Feb 2024	20	14	3	37
Mar 2024	20	33	4	57
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Feb 2025	42	23	0	65
Mar 2025	32	21	0	53
Apr 2025	37	52	0	89
May 2025	32	31	0	63
Jun 2025	53	30	1	84
Jul 2025	28	22	2	52
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Nov 2025	39	49	3	91
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Short summary

On 9 October 2018, an extreme convective storm (> 300 mm accumulated in 6 h) generated a flash flood (305 m³ s⁻¹) in the Ses Planes torrent that devastated the town of Sant Llorenç (Mallorca, Spain). Water reached a depth of 3 m in the most affected areas, and there was greatly increased flow velocity at bridges crossing the town. The floodwaters were very powerful and modified the channel morphology: more than 5000 t of sediment was deposited in the 2 km reach upstream of the town.


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