REPORT OF INVESTIGATIONS NO. 38 13
Relaotive Resistivity
EXPLANATION
10 -..
Sand
0- .
. Water-table Shells > aquifer 0- .i* 1* '. 1-,"!
n  C la y
Cla
o 5
E -20- Limestone
'-..... ..... ...........
Confining beds. ....... Dolomite 30.7 -- .L~ ~ ,:......__. Dolomite,
-40- crystalline
First artesian
-aquifer Silt and clay, S-50- very finely sondy
-70- //Second artesian
> .... ......... ii!!i~ iii~ iiil
aquifer
-80
Figure 4. Generalized geologic section and electrical resistivity log near Venice well field at site of proposed waterway showing hydrologic units.
feet. The pressure in well 706-226-5, which taps the Floridan aquifer, was measured on July 13, 1962 to be 23.8 feet above sea level. Thus, it was found that, on July 12, 1962, the deeper the aquifer, the higher the piezometric surface.
These water levels indicate that on July 12, 1962, after the well field had been idle for about 14 hours, water in general was moving, however slowly, up from the Floridan aquifer into the second artesian aquifer, from the second artesian aquifer into the first artesian aquifer, and from the first artesian aquifer into the watertable aquifer.
When water is pumped from the first and second artesian aquifers, the piezometric surfaces of these aquifers are lowered. This lowering is great enough near the pumping wells to change the direction of flow between the water-table and first artesian aquifer. Water is then induced into the first and second artesian