Hilgendorf. — Artesian Wells in the Christchurch Area. 143 



allowed to come to rest. The oscillations ceased in about five minutes. A 

 loose-fitting plug was placed in the top of both the well-pipe and glass tube 

 to prevent the wind blowing down and agitating the level of the water. 



The readings were taken at 8 a.m. and 5 p.m., and only eleven read- 

 ings were missed during the year. 



The Monthly Fluctuation. 



Disregarding the minor variations, the well sank gradually from January 

 to June, during which time it fell 24 cm.. or 10 in. On the 10th June 

 and the following days, 6 in. of rain fell at Lincoln, and the well then 

 started to rise, and continued to do so for four months, during which 

 time it rose 66 cm., or 2 ft. 2| in., on an average of the weekly readings. 

 The lowest individual reading was 71-2 cm. on the 4th June, and the 

 highest 141-5 cm. on the 25th September and the 17th October. This gives 

 a maximum difference of 70-3 cm., or about 2 ft. 4 in. 



The following graph shows the static level of the well for each month 

 during the year, all the readings for the month being averaged to find 

 the level for that month. Below the graph of the static levels there is 

 shown the monthly rainfall at Lincoln in inches. 



Fig. I.— ftloNTirr.Y Averages or Height of Welt., and Monthly Totals of Rain 



l'ux at Lincoln. 



