430 GEOLOGY OF THE DENVER BASIN. 



to a height of 50 feet from the bottom. Upon cleaning, the former flow 

 was at once resumed. Instances of this nature have been frequent, and 

 occasionally wells have been permitted to flow continuously for the purpose 

 of obviating this difficulty. 



Tapping the same water-bearing stratum. But tWO illustrations of tile UiailV that 



might be cited are given. The first involves the Union Depot and Gas 

 House wells, Nos. 26 and 63, respectively. These wells individually 

 discharged to the same altitude, but when the Gas House well was allowed To 

 flow continuously a decrease of 50,000 gallons per day was noticed in the 

 discharge from the well at the Union Depot. Other wells in the vicinity also 

 came under this influence in greater or less degree. The second instance 

 is that of wells Nos. 115 and 116, known as the Eckhart wells, and situated 

 on elevated ground in North Denver. The original pressure of these wells 

 was 35 pounds to the square inch. The Gurlev well, No. 1 "_'(), at a lower 

 level, upon tapping the same water-bearing stratum that supplied the Eckhart 

 wells, so lowered their waterdevel as to cause their abandonment. 



A still further illustration of the interrelations of wells is found in the 

 increase of flow in summer over that in winter in the wells in the vicinity 

 of the Steam Heating Company, the water demanded by this company 

 being considerably less in the warmer than in the colder season. 



WELL DATA OF DENVER AM) SUBURBS. 



The following table (pp. 432-447) embodies a large proportion of the 

 well data of Denver and its suburbs, collected in 1886 and 1890 by Messrs. 

 Slack and Van Diest respectively. 



In the "Depth" column the figures give the total depth attained below 

 an arbitrarily adopted datum level — mean water in the Platte River at the 

 foot of Fifteenth street, Denver. To this is appended, with a plus or minus 

 sign, the number of feet above or below the datum level of the surface of the 

 ground at the bore. This second set of figures enables one to make a direct 

 comparison of the horizons of the various flows, and a like comparison of 

 the original, or later "heads," and the present water levels in individual wells. 



The lack of uniformity which appears in the data of the three columns 

 "Kate of discharge, head, or pressure" is due to the different manner in 



