Case study:Floodplain recreation on the Montone River at San Tomè (Forlì)

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Location: 44° 14' 51.86" N, 12° 0' 45.83" E

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Project overview

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Status	Complete
Project web site
Themes	Flood risk management, Habitat and biodiversity, Hydromorphology, Monitoring
Country	Italy
Main contact forename	Fausto
Main contact surname	Pardolesi
Main contact user ID
Contact organisation	Regione Emilia Romagna – Servizio Tecnico di Bacino “Fiumi Romagnoli
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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The interventions carried out on the Montone river are part of a general project dating back to the '90s called "Fiumi Puliti” (Clean Rivers); the main goals of that project were the “maintenance” of river beds of the Romagna area, the reduction of flood risk and the implementation of the Montone River Natural Park, in the Municipalities of Forlì and Castrocaro. The main tool put in place to achieve these objectives was to return to the river part of the floodplains, both public domain and private, that were , separated from the river due to construction of embankments. Since 1992, this strategy has allowed to recover, within a relatively short stretch of the river, a storage capacity of more than 2,500,000 cubic meters. This space was returned to the natural flood dynamics lowering the alluvial plane and/or displacing the embankments to the external borders of the floodplain. The San Tomè area, located near Forlì, before the project was private cultivated land (orchards), former floodplain, surrounded by a main embankment and separated from the river by a secondary one, strongly reducing its flooding frequency. The works, carried out between 2004 and 2007 by the Servizio Tecnico di Bacino Romagna (River Basin Technical Services part of the Emilia Romagna regional administration) included the removal of the internal (secondary) embankment and lowering and reshaping the floodplain, on 9 hectares. This allows an increased flooding frequency, with a positive effect on flood risk downstream. Project costs included approximately 440,000 € for land expropriation. The estimated 2 million € for earth moving were compensated for by part of the excavated material, that was made available to the company performing the works. This funding approach may be considered negatively under a geomorphological perspective. However, it has to be underlined that the sediment extraction (ranging between 2 and 5 m) from the (former) floodplain has not reduced the amount of material potentially available for erosion and transport downstream (and finally for coastal sediment supply); in fact the excavated areas were already outside the river mobility corridor, they had become terraces, mostly protected against erosion along all the banks. Moreover part of the fine material with no commercial interest was introduced in the river bed during some ordinary flood events, in order to increase (at least occasionally) the sediment supply downstream.

Monitoring surveys and results

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The ecosystem improvements are under monitoring through the M.A.I.S.O.N. project.

Lessons learnt

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Image gallery

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The San Tomè floodplain, before restoration.

The San Tomè area, near Forlì, before the restoration project. Note the river on the left, separate from the large floodplain (used as orchard) included between the river itself and the embankment on the right.

The San Tomè area in 2006, before the restoration works.

The San Tomè area in 2008, after the restoration works.

The San Tomè area in 2011.

The San Tomè area after the restoration works.

The San Tomè floodplain.

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Appennino meridionale River basin Subcatchment River name Montone Area category Area (km2) Maximum altitude category Maximum altitude (m) Dominant geology Ecoregion Italy and Corsica Dominant land cover Waterbody ID Other case studies in this subcatchment: Floodplain recreation on the Montone River at the confluence with the Rabbi Stream Site Edit site Name San Tomè (Forlì) WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body No National/international site designation Local/regional site designations Protected species present No Invasive species present No Species of interest Dominant hydrology Dominant substrate River corridor land use Intensive agriculture (arable) Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) Average channel gradient category Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) Project started Works started 2004/01/01 Works completed 2007/12/31 Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Stakeholder engagement and communication Works and works supervision Post-project management and maintenance Monitoring Supplementary funding information Approximately 440,000 € for land expropriation. The earth moving works (approximately 2 million €) have been carried out in a "compensation" way. Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Flood risk management Hydromorphology Channel pattern/planform Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Introducing sediment Floodplain / River corridor Removal of embankments, Lowering of floodplain, Floodplain reconnection Planform / Channel pattern Other Non-structural measures Management interventions land acquisition Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit Physico-chemical quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Any other monitoring, e.g. social, economic Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information