265 



OahUj between Punaluu and Waimea, have practically no low wa- 

 ter flow ; but a large flood discharge. The discovery of two pos- 

 sible large reservoir sites near Laie and Kahuku have led to the 

 investigation of the flood flow of streams in this vicinity. Con- 

 tinuous record stream measurement stations were established at 

 high elevations on five of the largest streams in the vicinity, and 

 almost continuous records of all flow of these streams have been 

 secured since. The cost of these stations was paid by the Laie 

 and Kahuku plantations. This division is maintaining and operat- 

 ing the stations and furnishing the data therefrom to those in- 

 terested. 



Weather Conditions. This division maintains about eighty-nine 

 rainfall stations at high elevations, and at various places where 

 the U. S. Weather Bureau is unable to receive daily observations. 

 These stations are equipped with instruments which may be read 

 at monthly or longer intervals, and are visited by employees at 

 irregular intervals in connection with other duties. 



The following brief summary of 1915 weather conditions is 

 based on both the records of this office and the published records 

 of the U. S. Weather Bureau : 



The first three months of the year were dry and in March a 

 serious condition of drought existed over most of the Territory. 

 About the middle of April the drought was broken by heavy 

 down-pours which caused much damage to crops and structures. 

 At Hana, Maui, on April 27th, over 24 inches of rain fell in less 

 than four hours — according to the U. S. Weather Bureau observer 

 at that place. The month of May was fairly dry, but June and 

 July brought abundant rainfall without storms over most of the 

 Territory. August was fairly dry. About September 15th heavy 

 rains began over most of the islands, and continued during most 

 of the rest of the year, terminating in a heavy *'Kona" storm 

 which broke over the islands on December 24th and lasted sev- 

 eral days. 



The year ended with all streams and reservoirs filled to their 

 limits and with ho indications of water shortage in the near 

 future. 



The following table shows the rainfall measurement stations 

 maintained by this division on the various island : 



EAINFALL MEASUEEMENT STATIONS. 



Maintained on Established Discontinued Maintained on 



Island Jan. 1, 1915 during year during year Dec. 31, 1915 



Kauai 40 2 2 40 



Oahu 9 2 2 9 



Maui 22 10 12 



Molokai 4 4 



Hawaii 27 4 8 23 



Kona Investigation 6 5 1 



Total 104 12 27 89 • 



