51 

 DIVISION OF HYDROGRAPHY. 



Honolulu, January 22, 1915. 



Board of Commissioners of Agriculture and Forestry. 



Gentlemen: — The following- report of operation of the Divi- 

 sion of Hydrography during December, 1914, is submitted: 



RAINFALL. 



Dry weather continued during the month and with the excep- 

 tion of a large flood on windward Kauai on December 2 and 

 3d, which was the largest of the year, December was generally 

 one of the driest months of the year. Partial rainfall records 

 for the year seem to indicate that September was one of, if not, 

 the wettest month on record in the Territory. Unfortunately 

 shortage of funds caused the discontinuance of practically all of 

 the high mountain rain gages, so that only fragmentary records 

 are available. A few complete records are available at this time, 

 and many others will be received in the near future. On Oahu 

 the following- total 1914 records are interesting: 



Nuuanu Pali gage, elevation 1200 feet 140 inches. 



Wahiawa, mauka, elevation 1250 feet 218 



Wahiawa, makai, elevation 900 feet 41.2 



Waianae at Makaha, elevation 1300 feet. . . . 74.3 



DITCH SEEPAGE INVESTIGATION. 



The ditch efficiency investigation made at the sub-station of 

 the H. S. P. A. Experimental Station, was completed and a re- 

 port of the results olatained was forwarded to the Director of the 

 Hawaiian Sugar Planters' Association Experimental Station on 

 December 2, 1914. Additional investigation work of this nature 

 was done in cooperation with the Hawi Plantation & Mill Co., 

 and with the Kohala Ditch Co. on Hawaii. Copies of these re- 

 ports are attached hereto. The cooperative investigation work 

 with those plantations which have signified a desire for this 

 work, will be started in January, 1915, and will include during 

 the year the following plantations : 



Oahi — Waialua Agricultural Co., Oahu Sugar Company, Ewa 

 Plantation Co., and Honolulu Plantation Co. 



Maui — Maui Agricultural Co., and Pioneer Mill Co. 



Kauai — Kekaha Sugar Co. 



It is considered probable that other plantations will take ad- 

 vantage of this work during 1915. 



