A Review of the Impact of ET on Green Infrastructure and Urban Runoff

Feng, Youcan; Burian, Steven J.; Pomeroy, Christine

doi:10.1061/9780784412312.022

Cited by 2 publications

(2 citation statements)

References 10 publications

(7 reference statements)

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“…Particularly in urban areas, the observed increases in surface runoff that result from impervious surfaces can be accompanied by decreases in actual evapotranspiration due to these same impervious surfaces, which can in fact lead to an increase in recharge rather than a decrease in these areas (Barron et al 2013;Brandes et al 2005;Minnig et al 2018). While these relative changes were beyond the scope of this study, the interested reader may refer to literature (Appleyard 1995;Bhaskar et al 2015;Feng et al 2012;Sharp 2010;Wittenberg and Sivapalan 1999) for a more in-depth discussion on the feedback between ET, runoff, and recharge.…”

Section: Importance Of the Runoff-recharge Relationshipmentioning

confidence: 90%

Estimating surface runoff and groundwater recharge in an urban catchment using a water balance approach

et al. 2021

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Land-use changes often have significant impact on the water cycle, including changing groundwater/surface-water interactions, modifying groundwater recharge zones, and increasing risk of contamination. Surface runoff in particular is significantly impacted by land cover. As surface runoff can act as a carrier for contaminants found at the surface, it is important to characterize runoff dynamics in anthropogenic environments. In this study, the relationship between surface runoff and groundwater recharge in urban areas is explored using a top-down water balance approach. Two empirical models were used to estimate runoff: (1) an updated, advanced method based on curve number, followed by (2) bivariate hydrograph separation. Modifications were added to each method in an attempt to better capture continuous soil-moisture processes and explicitly account for runoff from impervious surfaces. Differences between the resulting runoff estimates shed light on the complexity of the rainfall–runoff relationship, and highlight the importance of understanding soil-moisture dynamics and their control on hydro(geo)logical responses. These results were then used as input in a water balance to calculate groundwater recharge. Two approaches were used to assess the accuracy of these groundwater balance estimates: (1) comparison to calculations of groundwater recharge using the calibrated conceptual HBV Light model, and (2) comparison to groundwater recharge estimates from physically similar catchments in Switzerland that are found in the literature. In all cases, recharge is estimated at approximately 40–45% of annual precipitation. These conditions were found to closely echo those results from Swiss catchments of similar characteristics.

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Section: Importance Of the Runoff-recharge Relationshipmentioning

confidence: 90%

Estimating surface runoff and groundwater recharge in an urban catchment using a water balance approach

et al. 2021

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“…In certain environments, depending on the level of urbanization, this can in fact lead to an increase in recharge rather than a decrease in these areas (Barron et al, 2013;Brandes et al, 2005;Minnig et al, 2018). While relative changes were beyond the scope of this study, the interested reader may refer to literature (Appleyard, 1995;Feng et al, 2012;Wittenberg and Sivapalan, 1999) for a more in-depth discussion on the feedback between ET, runoff, and recharge.…”

Section: Discussionmentioning

confidence: 98%

Groundwater contamination, recharge, and flow dynamics in the anthropogenic environment

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Understanding the dynamics of groundwater resources subject to the pressures of human activity has become a central topic in 21st century hydrogeology. Groundwater availability is defined both in terms of quantity – how much water is stored an aquifer – and in terms of quality – how much groundwater of sufficient quality is available for consumption. Changes in land use have directly impacted both of these facets. Due to its hidden nature, accurately determining the amount of available groundwater is notoriously difficult, and the added complexity of human stressors only augment these difficulties. In addition, the human landscape itself is undergoing rapid change, with a consistent increase in the human population, most of who now live in cities. This population increase has led to increasing land surface dedicated to anthropogenic use, and requires ever greater amounts of water resources for drinking water, agricultural applications, and industrial processes. Hence why a rising number of efforts have emerged in scientific literature on the topic of groundwater in the human environment. With these facts in mind, this thesis has dealt with identifying the impacts of various anthropogenic land-use patterns on groundwater resources, and the specific discussions around these impacts in modern studies. With the knowledge assembled from current literature, we explored the applicability of both established and novel hydrological and hydrogeological tools to accurately characterize the groundwater cycle in the anthropogenic environment. Our study was carried out at a test site in an urbanizing catchment on the Swiss Plateau, containing a shallow, unconfined fluvioglacial aquifer. Emphasis was therefore placed on an urban area where the groundwater is actively exploited for municipal and agricultural water supply. Our methods included an analytical water balance to estimate groundwater recharge using readily-available public data, followed by statistical analysis of chemical indicators to identify the sources and pathways of water into and out of an aquifer. With minimal public data, we were able to estimate historical patterns of groundwater recharge over the course of a decade, including an assessment of changes in the individual variables of the groundwater balance – notably storm runoff versus infiltration. To supplement public data for further analysis, a network of groundwater monitoring wells was installed across the most urbanized area of our study catchment, from which a database including physical, chemical, and isotopic variables was constructed. For chemical analyses, inorganic ions, with a long record of use, were analyzed along with organic micropollutants, which are a relatively novel tool specific to human environments. This data, combined with information on the layout of the river network and the sewer system, allowed us to evaluate potential interactions between groundwater, surface water, and the sewer network. These results have demonstrated the suitability of our approach to capture groundwater dynamics in an urbanizing catchment.

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A Review of the Impact of ET on Green Infrastructure and Urban Runoff

Cited by 2 publications

References 10 publications

Estimating surface runoff and groundwater recharge in an urban catchment using a water balance approach

Estimating surface runoff and groundwater recharge in an urban catchment using a water balance approach

Groundwater contamination, recharge, and flow dynamics in the anthropogenic environment

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