Publication Date:
2021-07-06
Description:
Upward leakage of saline water from an artesian aquifer below 1,500 feethas caused an increase in chloride concentration in the lower Hawthorn aquiferfrom less than 1,000 mg/1 (milligrams per liter) to values ranging from about1,300 to 15,000 mg/1. Similarly the higher temperatures of the intruding waterhas caused an increase in water temperatures in the aquifer from 82"F to valuesranging from 83 to 93"F. The intruding water moves upward either through theopen bore hole of deep wells or test holes, or along a fault or fracture system,which has been identified in the area. From these points of entry into the lowerHawthorn aquifer, the saline water spreads laterally toward the south andsoutheast, but is generally confined to components of the fault system.The saline water moves upward from the lower Hawthorn aquifer into theupper Hawthorn aquifer through the open bore hole of wells, which connect theaquifers. This movement has resulted in an increase in chloride from less than200 mg/1 in the unaffected parts of the upper Hawthorn aquifer to valuescommonly ranging from about 300 to more than 3,000 mg/1 in parts of theaquifer affected by upward leakage. The upper Hawthorn aquifer is the principalsource of ground-water supply for public water-supply systems in western LeeCounty.Similar effects have been noted in the water-table aquifer, where chlorideincreased from less than 100 to concentrations ranging from about 500 to morethan 5,000 mg/1. This was caused by the downward infiltration of waterdischarged at land surface from wells tapping the lower Hawthorn aquifer.The spread of saline water throughout most of the McGregor Isles area iscontinuing as of 1971.(40 page document)
Keywords:
Oceanography
;
Limnology
;
Earth Sciences
;
saline intrustion
;
Florida
;
Lee County
Repository Name:
AquaDocs
Type:
monograph
Format:
application/pdf
Format:
application/pdf
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