artesian head is about 30 feet with reference to sea level. In the southwestern part of the county and in the adjacent part of Orange County the artesian head is somewhat higher, indicating that there is a movement of the water toward the northeast and that the intake area is southwest or west of Seminole County.
Fluctuation of head
Fluctuation of artesian head may be caused by a number of conditions. According to reports of well owners the largest fluctuations occur during the irrigation seasons in periods of heavy draft. These are caused in part by opening and closing of many wells and pumping of wells in irrigation districts. When a large number of wells are in use there is a lowering of the artesian head, and when the wells are closed there is an1 increase in head. Increase in head is especially noticeable after rains, not because of recharge produced by the rains but because the wells used for irrigation are closed in rainy weather and the draft of water is in consequence greatly reduced. There are also fluctuations caused chiefly by recharge in the intake area.
Quality
In general the water from shallow wells terminating in the surficial sands is reported to be soft and low in mineral content except in
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