306 



evaporation, in the two main ditches. Two steel portable weirs 

 have been completed to make temporary measurements in the level 

 ditches, which should show the losses incurred in this type of ditch. 

 The actual hydrometric work will be undertaken during Septem- 

 ber and October. 



Tw^o water utilization and power investigations were started on 

 the Kaluanui. Punaluu and Waihee watersheds. 



Routine stream and rain-gaging operations and maintenance 

 were carried on during the month, including hydrometric work 

 in connection with the water supplies being investigated in con- 

 nection with Honolulu's water supply. 



The rainfall during the month continued above the average for 

 this time of the year, in the catchment areas along the Koolau 

 mountain range and on the windward coast. Rather exception- 

 ally dry conditions prevailed between the Koolau and Waianae 

 ranges and on the leeward coasts. 



KAUAI. 



Kauai reports that excessive rainfall conditions continue to pre- 

 vail over most of the island, especially along the windward side. 



Practically the entire month was used on routine stream and 

 rainfall measurement operations in connection with the new sta- 

 tions recently established. A reconnaissance was made of the 

 North Wailua and east branch of the North Wailua Stream to 

 determine the materials needed for the new proposed clock regis- 

 ter stations on these streams, the installation of which will put 

 practically all government-owned water on Kauai under investi- 

 gation. 



A special series of measurements was made in connection with 

 the Lihue Ice & Electric Power Co. in connection with turbine 

 power tests. 



MAUI. 



During the month routine stream and rainfall measurements 

 were made at 30 stream-gaging stations and four mountain rain- 

 fall measurement stations. The large rain gage maintained at tiie 

 1500- foot level in the Waihee Valley was visited. This gage has 

 a capacity of 300 inches and during the period April 29 to Sep- 

 tember 1 collected 258 inches of rainfall, or a mean of 64.5 inches 

 per month. 



A section of the Honolua ditch was rated and a rating table 

 furnished to the Honolua Ranch Co. to be used in making tests 

 of the power plant now being established. 



HAWAII. 



Heavy rainfall in the vicinity of Hilo and Kamuela prevented 

 further cooperative work for the Attorney General's department. 



