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05-13-13 Agenda & Packet
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05-13-13 Agenda & Packet
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5/9/2013 4:31:11 PM
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5/9/2013 11:34:28 AM
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City Council - City Clerk
City Council - Document Type
Agendas
City Counci - Date
5/13/2013
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Water -table and confined (artesian) aquifers. <br />WATER -LEVEL RISES <br />The opposite problem, namely a rising water table, has developed in some parts of <br />the country. Rising water tables occur in areas where pumpage has been curtailed after <br />years of large ground -water withdrawals, such as for mine dewatering or municipal <br />water supply, which kept the water table below its natural levels. The curtailment of <br />pumping allows the water table to rise to the previous natural level, which may flood <br />underground structures that were built when the water table was lowered. <br />In many parts of the country, water levels in shallow aquifers have been lowered <br />artificially over large areas. If houses are constructed in dewatered areas and if the <br />water table then recovers to its natural (higher) level, basement flooding or foundation <br />failures may occur, especially where the natural water level is within 10 feet of the land <br />surface. Many basements that were built in a dry unconsolidated material and that had <br />remained dry for decades have now become permanently wet. The public's first reaction <br />may be that unusually heavy precipitation in the past few months has raised the water <br />table or created a temporary perched -water system, when in fact the situation is much <br />more serious and will remain a problem unless pumping is resumed to maintain a lower <br />water table. <br />Where water levels are closely monitored, water -level records can indicate whether <br />such high water levels are related solely to climatic events or whether water levels are <br />recovering after nearby pumping has ceased. An increasing number of local areas are <br />being dewatered for mining or industrial uses, which could cause serious problems in the <br />future when such pumpage is decreased or ended. <br />Similar situations have occurred where housing developments were built during a <br />period of extended drought when the water table was low. Even if basements were the <br />"daylight" or raised type because the natural water table was shallow, the eventual <br />return of a wet period caused the water table to rise a few feet and flood basements. <br />[Source: USGS Publication by Roger M. Wailler; p. 3, pp. 12 -13] <br />http: / /usQS qOV /Clip /Clw ruralhomeowner /gw ruralhomeowner new html <br />
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