110 



E. F. PITTMAN. 



Number 



of 

 Statiou. 



Depth of 

 Wells in 

 Inches. 



Velocity of 



ground- 

 water in feet 

 per day. 



Number 



of 

 Station. 



Depth of 

 Wells in 

 Inches 



20 



Velocity of 



ground- 

 water in feet 

 per day. 



Number 

 of 



Station. 



Depth of 

 Wells in 

 Inches. 



Velocity of 



ground- 

 water in feet 

 per day. 



1 



22 



5*5 



7 



2*6 



15 



42 



1*53 



2 



22 



2* 



8 



21*6 







15x 



62*5 



6 



2x 



22 



6' 



8 



21'6 



3*1 



16 



16 







3 



22 



2 



10 



28 



2'6 



16x 



16 



IT 



4 



22 



2 



11 



22 



o- 



16x 



16 



11*6 



5 



22 



C-4 



12 



27 



1*07 



17 



20 



10-6 



5x 



22 



5*4 



13 



16 



96' 



18 



62 



1- 



5y 



22 



8 



13 



10 



6*9 



i 21 



16*5 



21*3 



6 



34 



5 



14 



17 



9*3 



I 22 



16 



5*6? 



The mean rate of flow of the 27 determinations was 11*05 

 feet per day. The same writer has made determinations, 

 by the chlorine and other methods, of the rate of movement 

 of the underflow beneath the channel of the Arkansas River, 

 in Western Kansas. 1 He says, 



"Six miles below Garden, at a level of 10 feet below the river 

 bed, the velocity was found to be 2^ feet per day. The fall of the 

 river is about 7 feet per mile. The material below the 1 feet 

 level is coarser than that above, and the velocity is undoubtedly 

 higher. Determinations of the rate of underflow in the narrows 

 of the Hondo and San Gabriel Rivers, in Southern California, by 

 the author's critical method, gave rates of 3£, 4, 5£, and 7 feet 

 per day." 



According to M. L. Fuller,- the loss of head in the water 

 dercolating the St. Peter sandstone, in the States of Wis- 

 consin and Kentucky, amounts to only *67 feet per mile. If 

 it be assumed that the same rate of loss prevails in the 

 Triassic sandstones of the Australian artesian basin, and 

 there is no apparent reason why it should not, the total 

 loss of head between the Queensland hills and the bores 

 around Lake Eyre would only amount to about 400 feet ; 

 there is therefore nothing remarkable in the ascent of the 



1 The Motions of Underground Waters, E. C. Slichter, 1902. 

 Supply and Irrigation Papers U. S. Geol. Sur. No. 67. 



2 Personal communication already referred to. 



Water 



