Susceptibility of ground water to contamination, southern Gulf Islands, British Columbia

Denny, S; Journeay, J M; Allen, Diana M.

doi:10.4095/222640

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“…Higher groundwater levels can therefore be anticipated to be found at higher elevations, often inland, while lower groundwater levels can be expected to be found at lower elevations (Hodge, 1995). Upon reaching the bedrock, groundwater infiltrates through vertical and sub-vertical joints until reaching bedding planes and fractures where it disperses horizontally (Denny et al, 2006) (Figure 1.1). Such flow paths are expected to lead to rapid recharge and a short lag time between rainfall events and groundwater level response.…”

Section: 5mentioning

confidence: 99%

Response of a fractured bedrock aquifer to recharge from heavy rainfall events

Rathay

Allen

Kirste

2018

Journal of Hydrology

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The response of a fractured bedrock aquifer in a temperate region (Gulf Islands, British Columbia) to heavy rainfall events is characterized. Of the 14 provincial observation wells with hourly groundwater level data, wells with shallow water levels showed pronounced responses to heavy rain events, a lag less than 12 hours, and a strong correlation to all rain events. Rises in groundwater level at Well 125 appear to be better related to all rain events than exclusively heavy rain during summer, and decrease as the rainfall intensity increases. Thermal infrared images and δ 18 O and δ 2 H composition for precipitation and seepage indicate an increase in seepage in the late fall and winter.Solution of the Green-Ampt equation for rainfall events of varying magnitude suggest that an increase in winter rainfall intensity leads to more surface ponding and overland flow. The projected occurrence of more heavy rain events in the future may result in lower net recharge.

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Section: 5mentioning

confidence: 99%