Effects of variations in hydrogeological parameters on water-table mounding in sandy loam and loamy sand soils beneath stormwater infiltration basins

Thompson, Anita; Nimmer, Mike; Misra, Debasmita

Effects of variations in hydrogeological parameters on water-table mounding in sandy loam and loamy sand soils beneath stormwater infiltration basins | Effets des variations des paramètres hydrogéologiques sur le cône de recharge d′un aquifère dans des sols sablo-limoneux et limono-sableux sous des bassins d′infiltration Efectos de las variaciones en los parámetros hidrogeológicos en domos de los niveles freáticos en suelos arenolimosos y limoarenosos debajo de las cuencas de infiltración de aguas pluviales 水文地质参数变化对暴雨入渗洼地地下伏砂壤土及壤砂土中地下水丘的影响 Efeitos das variações dos parâmetros hidrogeológicos na elevação do nível da água subterrânea em solos argilo-arenosos e areno-argilosos sob tempestades, em bacias de infiltração

2010

Thompson, Anita | Nimmer, Mike | Misra, Debasmita

The two-dimensional variably-saturated numerical model HYDRUS-2D, previously calibrated to recharge events from an infiltration basin, was used to predict water-table mounding under hypothetical basin design scenarios, and the primary factors that affect water-table mounding were evaluated. Infiltration basins are often utilized in urban environments to recharge stormwater to the aquifer. As a result of localized recharge beneath these basins, mound formation may reduce the thickness of the unsaturated zone available to filter pollutants and may reduce the infiltration rate of the basin. Understanding the effects of various physical factors on water-table mound formation is important for infiltration basin siting. For sandy loam and loamy sand subsurface materials, mound heights increased as the thickness of both the unsaturated and saturated zones decreased. Mound heights increased as the initial soil moisture, basin size and ponding depth increased. A thin sedimentation layer on the basin floor delayed mound formation, but only slightly decreased the maximum mound height. This analysis could be used in future selection of infiltration basin locations; however, the analysis is limited to conditions that represent only a select range of basin design conditions and parameters typical of a glacial till environment in Wisconsin, USA.

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