FLORIDA GEOLOGICAL SURVEY


 STREAMFLOW

 During the flood of September 1960, caused by Hurricane Donna,
Lake Lowery reached a maximum stage of 133.32 feet above mean
sea level. During this flood, a road fill between a marsh in the
Withlacoochee River headwaters and Gum Lake marsh washed out
and an undetermined amount of water flowed southward into the
Peace River basin through an opening 12 feet wide (C-4, fig. 5).
 The flow at Gum Lake marsh outlet (station 22) includes the
drainage from 4.2 square miles in the Gum Lake basin plus that
diverted from the Withlacoochee River basin through opening C-4.
During the flood of September 1960, the peak discharge was not
determined but most of this flood discharge was from the
Withlacoochee River basin. The 3' x 8' box culvert and a section
of the highway at the gaging station were overtopped. The flood
peak reached a stage of 132.0 feet above mean sea level, as
determined from high water marks at the gage. During periods
of low rainfall there is no flow in this channel. For the period May
1961 to June 1962, the channel was dry. The average discharge at
station 22 was 0.55 cfs in 1961. There was no flow from Lake Alfred
during the period April 1961 to June 1962. The total surface
outflow from the Green Swamp area to the Peace River basin is
negligible except during flood periods.

 DIVERSIONS AND INTERCONNECTION OF BASINS

 Although surface drainage from the Green Swamp area follows
rather definite routes and although the drainage divides are
generally determined by the topographic features, there are several
places where the basins are interconnected and water is diverted
from one basin to another. Some of these points of diversion have
been mentioned under the foregoing discussion of the individual
drainage basins. The hydrologic importance of these intercon-
nections, which are integral parts of the drainage systems, is
shown in the following discussion.
 The arrows on the map in figure 5 locate and show the direction
of flow through many of the saddles in the drainage divides. The
interconnections that are shown on the map are the most important
ones disclosed by the investigation, but they by no means include
all such points in the small subbasins where there are no definite
drainage divides.
 One of the major diversionary channels is the Withlacoochee-
 Hillsborough overflow in southeastern Pasco County (C-9, fig. 5).