78 



DIVISION OF WATER RESOURCES 



- Jt was necessary to use a supply tank with each tule tank to main- 

 tain the water level between narrow limits. Tule Tanks Nos. 1 and 2 

 are directly connected to separate water supply tanks, 4 feet in 

 diameter and about 1 foot deep. A cone-shaped metal cover with an 

 air vent was fitted over the supply tanks, and a second cover was placed 

 over the sui')ply tanks to eliminate evaporation. With this arrangement 

 the fluctuations in the water surfaces of the tule tanks are reduced by 

 the replenishment of water from the supply tanks. Plate XIII shows 



PLATE XIII 



$yvamp water surface r^fi/jyyQH 



^■h=-=^ 



TanH N92 



/ 



dank 



P'P^^ \ %'p>P^ 



Supply tank B 



(O 



4 



ARRANGEMENT FOR TANK NO. 2 TO SUPPLY WATER AND TO MEASURE 

 AMOUNT OF EVAPORATION AND TRANSPIRATION. 



PLATE XIV 



^- 



3y/amp wafer surface 



ace-^ 



TanH No- 3. 



» VaJve 



I 5fillyyell 



r=75^ 



ARRANGEMENT FOR TANK NO. 3 TO REGULATE SUPPLY OF WATER AND 

 TO MEASURE AMOUNT OF EVAPORATION AND TRANSPIRATION. 



