200 



lower down in the Honolulu basin, off the trails and more cen- 

 trally located in the rainfall catchment areas. 



Two new clock register stations were constructed on the two 

 main branches of the Manoa stream, above all diversions. The 

 data to be obtained will be of immense valuQ in connection with 

 Honolulu's water supply. 



The instrument was installed on the new clock register which 

 was completed on the Punaluu stream in April. 



Arrangements were made during the month for the installation 

 of six new clock register cooperative' stream-gaging stations, and 

 one clock register ditch-gaging station. The stations are to be 

 built during June and July, and are to be operated by this office. 

 All equipment, material and construction cost will be borne by 

 the cooperating parties, while the hydrographic division will over- 

 see the construction and installation, and will maintain, operate 

 and rate the stations in the future. 



The cooperating parties are as follows : 



Kahukii Plantation Co. — Three stations to measure the run-off 

 of the main Malaekahana, middle branch of the Malackahana, 

 and Kahawainui streams. 



Laie Plantation Co. — Two stations to measure the run-oft' of 

 the Wailele and Koloa streams. 



U. S. Army — One station to measure the run-off of the south 

 fork of the Kaukonahua stream, below the storage reservoir of 

 the Schofield Rarracks water supply. Also one ditch station to 

 measure the inflow from the ditch into the reservoir. 



Ten stream-gaging stations' and four rainfall-measurenicnt sta- 

 tions were visited during the month. 



MAUI. 



Maui also received an unusual amount of rainfall during May, 

 which was well distributed, and there were no large floods. 



The old staff gage on the Waikapu stream was washed away, 

 and a new gage was established at a new datum. 



Thirty-two stream-gaging stations were visited and 36 meas- 

 urements were made. 



GENERAL. 



The 1013 (lata have been completed, bine ])rinle(l, and are now 

 ready for distribution. lUuc prints of data are Iieing mailed to 

 all public officials, ])lantations, ranches, etc., to whom these data 

 may be of value. 



Very respectfully. 



(\. \\. r^AKKISOX. 



Snpirinleudeiit of I I \(lrogr;ii)hy. 



