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Utility trench water level recessions in an aquitard: findings from analytical and numerical analyses
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Utility trench water level recessions in an aquitard: findings from analytical and numerical analyses
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Journal Article
Utility trench water level recessions in an aquitard: findings from analytical and numerical analyses
2022
Overview
Utility trenches are an integral part of a sewer system. When situated in an aquitard, their coarse granular bedding material potentially forms a preferential flow path. The hydrologic functioning of the utility trenches and their bedding has been analyzed using water level data from a unique district-wide investigation of the interaction between a storm sewer system, the associated utility trench network and an aquitard. Utility trench water level recessions have been examined using analytical results based on recession analysis with the one-dimensional (1-D) Boussinesq equation, as well as deterministic 1-D and 2-D numerical groundwater models of utility trenches. The results show that water level rises occur after cessation of exfiltration recharge. These rises are associated with nonequilibrium recharge and occur when branch utility trench flows exceed the downslope trunk utility trench flows. A near-linear recession occurs when the branch utility trenches transition into a quasi-exponential recession on cessation of these water level rises. The magnitude of water level rises and duration of the near-linear recession are increased by the convergence of flow from branch utility trenches to the trunk utility trench. A utility trench network situated in an aquitard could be considered an analog for some natural aquifers with preferential flow paths. It is proposed that significant post-recharge storage increases associated with nonequilibrium recharge events could occur in such aquifers, which may be indicated by near-linear recessions preceding quasi-exponential recessions.
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