IRRIGATION IN FLORIDA. 



49 



has extended to the fifth foot in depth. The other curves show the 

 soil moisture one day and three days after, as well the the rapid dis- 

 appearance of the irrigation water. 



A great many interesting points are brought out by this chart, one 

 of the most important from the irrigator's standpoint being the rapid 



2 fc 1 o 



Width in Feet 



Fig. 8. — Cross section of water distribution shown in figure 7. 



downward trend of the water when applied by flood or surface 

 method. It will be noted that practically no water was lost by per- 

 colation or seepage below the sixth foot until more than an hour 

 after the water had been turned off ; after that time there was some 

 loss. Water was run down a broad furrow at the rate of about 75 

 gallons per minute for 30 minutes. 



Figure 8 shows a cross section of the same water distribution. In 

 this case water was run 40 minutes over similar soil and with the 



