Located at the interface between terrestrial ecosystems and water resources such as water courses and shallow water tables, wetlands are a pivotal part of the drainage network of a watershed.Consequently, they affect the routing of overland and subsurface flows through modification of hydrological processes, namely increased evapotranspiration, water storage and groundwater recharge (Bullock and Acreman, 2003). These interactions have led researchers and land planners to attribute some hydrological services to wetlands, such as low flow support and high flow attenuation. As defined by Roche (1986), low flows refer to the lowest annual flow of a water course at a given point in space.To characterize low flows, various hydrological indicators have been defined, taking into account the return period: 2-year minimum flow over 7 days, 10-year minimum flow over 7 days, 5-year minimum flow over 30 days, etc. On the other hand, high flows are defined as the peak flow within a specific return period, typically 2-, 20-or 100-year maximum flows.In the last century, anthropic activities such as agricultural and urban development have induced major land cover changes; affecting the hydrological regime of watersheds (St-Hilaire et al., 2015;Salvadore et al., 2015;Savary et al., 2009;DeFries and Eshleman, 2004). Agricultural impacts on hydrological processes are mostly associated with artificial drainage, which alters the water volume and timing of runoff (e.g.: Muma et al., 2016;Blann et al., 2009). For example, in the Redwood basin, a Midwestern United States agricultural basin, the total area of soybean (associated with the installation of extensive subsurface drainage tiles) increased from 15% to 40% between 1971 and 2002, and this led to an increase in mean annual flows from 2.3 m 3 /s to 6.0 m 3 /s (Foufoula-Georgiou et al., 2015). Similarly, Muma et al. (2016) showed that subsurface drainage increased base and total flows, and decreased peak flows of an intensively farmed 2.4 km 2 watershed (90% in cropland with 30% of the watershed area tile-drained). As for the impacts of urban development on hydrology, characterized by increasing impervious surfaces, they range from affecting water supply by limiting infiltration, to changes in water demand in response to an increased population (DeFries and Eshleman, 2004;Diem et al., 2018). In the Atlanta metropolitan area, impervious cover of the Big Creek and Suwanee Creek watersheds increased from 8 to 17% and from 9 to 21% respectively, between 1992 and 2011, inducing an increase in the annual stream flow of 26% (Diem et al., 2018).Anthropic activities have also led to the draining of wetlands and modification of the land cover within their drainage area (Zedler and Kercher, 2005;Brinson and Malvarez, 2002). At the global scale, wetland losses estimations are up to 87% and the yearly rate of these losses accelerated between -0.68 to -0.69% in the 1970s to between -0.85 to -1.60% in the 2000s, depending on the region (Davidson, 2014; Ramsar Convention on Wetland, 2018). In all li...
