16 



OPERATION AND MAINTENANCE WORK. 



Kauai. Twenty-four stream and ditch measurement stations 

 and eight rainfall measurement stations were visited. Thirty 

 stream and ditch discharge measurements were made. 



A heavy fence was constructed around the temperature meas- 

 urement station recently established at Kokee. This instrument 

 registered a minimum of 41 degrees F. on the morning of De- 

 cember 15. 



A heavy rain storm accompanied by lightning and thunder 

 visited the Island of Kauai on December 18. The water-stage 

 recorder on the Hanapepe river was washed away and has not 

 been recovered. The two foot-suspension bridges on the two 

 branches of the Wainiha river in the lower valley were also 

 destroyed. 



Oahu. Fourteen stream and 13 rainfall measurement stations 

 were visited and 7 stream measurements were made. 



Blue print data pertaining to the flow of the North and South 

 Forks of the Kaukonahua stream were furnished the U. S. Army 

 and the Wahiawa Water Co., Ltd. 



Maui. The first four days of the month were spent by G. K. 

 Larrison in showing and dismantling the hydrographic exhibit 

 at the Mlaui County Fair. One stream measurement station was 

 visited. 



H. A. R. Austin visited 18 stream and one rainfall measure- 

 ment stations, made 18 discharge measurements and repaired 

 and cleared about two miles of trail. 



Hawaii. H. A. R. Austin spent three days collecting data and 

 information relative to the Kohala and Kehena ditches. 



Very respectfully, 



G. K. Larrison, 

 Superintendent of Hydrography. 



