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Hydrogeology

There are two primary aquifers in the New Haven area:

1) The Missouri River alluvial aquifer, and
2) The Ozark aquifer (bedrock)

Downtown New Haven lies in the Missouri River Valley. Unconsolidated sediments beneath downtown are part of the Missouri River alluvial aquifer. Beneath downtown New Haven, the alluvial aquifer is about 30 to 40 ft (feet) thick with the thickness increasing toward the Missouri River. At normal stages of the Missouri River, the water table in the alluvial aquifer beneath downtown New Haven is about 20 ft below the land surface and slopes northeast toward the river channel. The upper 5 to 15 ft of aquifer consists of silt and clayey silt that grades into sand and gravel near the base of the alluvium. The Missouri River alluvial aquifer can be more than 100 ft thick and is used extensively for public, domestic, and industrial water supplies in Missouri. The alluvial aquifer is not used for water supply in the immediate vicinity of New Haven.

The bedrock beneath New Haven is part of the Ozark aquifer. This aquifer is more than 1,000 ft thick beneath New Haven and consists mostly of limestone and dolostone with some cherty dolostone and sands. This aquifer is used extensively for public, industrial, and domestic water supplies throughout southern Missouri. Domestic, industrial, and public supply wells in the New Haven area obtain their water from this aquifer.



>Click on picture for expanded view (194 kb).
BEDROCK AQUIFER

A water table map can help in understanding the direction of shallow ground-water flow. Shallow groundwater flows perpendicular to contour lines from higher ground-water altitudes to lower ground-water altitudes along streams like Boeuf Creek and the Missouri River. Knowing the direction of shallow ground-water flow is important in understanding which direction PCE may be migrating and where the source(s) of contamination may be located. To the left is a water table map generated from ground-water level measurements in and around the New Haven.
Geohydrologic Cross Section

To the right is a geohydrologic cross-section along the line A-A' (shown on the water table map) depicting the orientation of the geologic formations lying below the city of New Haven. Also shown is the approximate water-table surface. The Ozark aquifer beneath New Haven is more than 1,000 ft thick. Most domestic wells are drilled less than 400 ft deep, have less than 200 ft of casing (shown in black), and are completed in the Jefferson City Dolomite and Roubidoux Formation. Industrial and municipal wells in New Haven are more than 800 feet deep and are open to a larger thickness of the aquifer. A ground-water divide is present in the upper part of the aquifer in the vicinity of highway 100, however, this divide probably does not extend through the entire thickness of the aquifer.


Click on picture for expanded view (139kb).

Click on picture for expanded view (54kb).
Various Geologic strata have different water bearing properties.

The bedrock in the New Haven Area is part of the Ozark aquifer and is primarily crystalline limestone and dolostone with intermittent chert and sandstone layers. The table to the left depicts the general positions of the geologic units within the Ozark aquifer, their relative lithologies, and typical yields of water to wells. Data compiled by the Missouri Department of Natural Resources, Division of Geology and Land Survey.

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