THE, ARTESIAN ^ATE.R S.UR^EY, OF. EASTERN FyORNPA,, ,113 
$2.00 pep foot The, larger wells range in proportion,. a. Ten. inch 
well cpsting about $3,50. per foot.' The driller-at these prices 
furnishes the casing-. ... , ... . t ,, ., i; < + . r 
' ' v ‘ ' 'h' 
Increased flow of artesian' wells.increased., 
' . ■ . depth. ( ! ' \ ; * .' ; 
As a rule , the amount of flow or yield of wells in eastern 
Florida increases with depth. To this rule there are doubtless 
exceptions since the amount of flow in all cases depends upon.,the 
variable structure of the rock through which the drill passes. As 
illustrations of increased flow with .increased depth the following 
may be cited: ... 
In the new city well at Jacksonville, well No. 10 of the city 
water supply, the first flow obtained was a. light flow of 5 gallons 
per minute at a depth of 270 feet. At a depth of 4.98 feet the 
flow increased to 112. gallons per minute. Upon reaching the 
Vicksburg Limestone at a depth of 510 feet the flow increased 
to 200 gallons per minute. The flow at the depth of 635 feet 
was found to be 500 gallons per minute. At 900 feet the flow 
was about 900 gallons per minute. At 980 feet, the full depth of the 
well, the flow was from 1,500 to 2,000 gallons per minute. For 
the detailed measurements of flow on this well the Survey is in¬ 
debted to the drillers, the Hughes Specialty Well Drilling Company 
of Charleston, South Carolina. 
A like increase of flow is shown by the Ponce de Leon well 
in St. Johns County, the measurements of which were kept and 
have been kindly supplied by Messers McGuire arid MacDonald, 
contractors. The first flow in this well of 50 gallons' per minute 
was obtained at a depth of 170 feet. At 177 feet the flow in¬ 
creased to 350 gallons per minute. At 410 feet the flow was 
2083 gallons. At 520 feet the flow had increased to 4860 gal¬ 
lons. At mo feet the flow was 6075 gallons. The well was 
continued to a total depth of 1440 feet. The record of the well 
however, contains no mention of increased flow'below mo feet. 
While exact measurements like those given above are seldom 
made the drillers with few exceptions report increased flow with 
increased depth. 
INCREASED HEAD WITH INCREASED DEPTH. 
Not only does the amount of flow of the water in this section 
of the State increase with increased depth, but the head or pres¬ 
sure or height above the ground to which the water will rise like- 
