A Wetting-Front Model for Vadose Zone Infiltration via Drywells

Z. Moreno*, A. Paster, T. Kamai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Drywell infiltration is a common approach to recharge groundwater and reduce load from drainage systems. In order to properly design a drywell, it is critical to predict its infiltration capacity, that is, its response to anticipated precipitation/stormwater/flood events. This is commonly conducted using models that solve the unsaturated flow in the subsurface using complex and costly numerical schemes. This work proposes a different approach, based on a solution for a sharp interface wetting front. The proposed model predicts the water level in the well and the subsurface wetting front location during and after an infiltration event. The model was tested and compared with numerical simulations of Richards' equation and with data from a field experiment, and proved to be sufficiently accurate. The typical run times of the model are smaller than 1 s and about three orders of magnitude shorter compared to the numerical model of Richards' equation. For illustrating possible applications, we use field data: the model is used to estimate the hydraulic properties via parameter optimization. Finally, a sensitivity analysis of the drywell response was conducted, demonstrating some practical applications for analysis, which may be used for properly determining site-specific drywell design.

Original languageEnglish
Article numbere2022WR033554
JournalWater Resources Research
Volume59
Issue number1
DOIs
StatePublished - Jan 2023
Externally publishedYes

Funding

FundersFunder number
Alexander Yurishchev and Yossi Achdut
Chief Scientist of the Jewish National Fund
Jewish National Fund
Tel Aviv University

    Keywords

    • artificial recharge
    • infiltration
    • porous media
    • stormwater harvesting
    • urban runoff
    • variably saturated flow

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