surface of the foundation 62 with reference to fig4 and 5 the tube tank portion 60 has parallel side walls extending from the foundation for a height of ninety feet the side walls then diverge into an elliptical tube portion 62 having an overall height of thirty feet for a high water elevation level of one hundred twenty feet from the foundation similar structure is found in the embodiment of fig4 and 5 to that of fig1 through 3 including a six inch diameter overflow pipe 64 terminating adjacent to the high water level in the tank in fig6 and 7 a tube tank portion 70 extends until reaching a spherical bowl portion 72 for a combined height of one hundred twenty feet from the foundation tube to the high water elevation the spherical bowl portion has a diameter of forty four feet similar to fig1 and 4 a six inch diameter overflow pipe 74 extends to the high water level elevation of the tank in fig8 the volume per foot curve of the tank design of the present invention is compared to existing tank designs and as can be seen from these plots the present design is by far the most efficient the plots show how the volume of the tank design differs from the standard elevated tank design and the standard tube tank design the curves are based on stored volume of 150.