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| | Boston Ground Water Trust |
 | | The second in a series of studies on Back Bay, this article summarizes groundwater levels in Back Bay since the area was filled more than 100 years ago, and traces the effects of construction of sewers and drains, subways and other transportation corridors, and buildings on the groundwater table. |
 | | Although most of the precipitation in Back Bay becomes runoff and is carried away by storm drains and sewers, the seasonal variations in the type, and level, of precipitation cause an annual fluctuation in groundwater levels up to about 2 ft. in some areas. |
 | | Dewatering for the construction of sewers and drains, subways and other transportation corridors, and many buildings has temporarily lowered the groundwater table in the fill and, in particular, the piezometric head in the sand outwash over a large area of Back Bay, in some cases for a period of several years. |
| www.bostongroundwater.org /ceprep.html (12142 words) |
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