293 



Honolulu basin (between Fort Shafter and Diamond Head) by 

 the Territory. (It is estimated that there are about 66 active 

 wells in this area which are discharging, either by being pumped 

 or flowing, about 35 million gallons per day. The total supply 

 used by Honolulu for domestic and municipal purposes at present 

 is about 15 million gallons per day.) 



2. The acquirement, transmission, and storage of surface flow. 



A small amount of work done at the request of and in coopera- 

 tion with a member of the City Water Commission resulted in 

 definitely determining that the principal source of leakage from 

 Reservoir No. 4 in the upper Nuuanu Valley is due to a break in 

 the outlet pipe. 



A weir and continuous record measurement station was estab- 

 lished in May in Hillebrand Glen to determine the actual run-off 

 from this valley. 



Military Co-operation. 



An investigation of the water resources between Waialae and 

 Makapuu Pt. was made for the U. S. military authorities. The 

 cooperative stream and rainfall measurement work being done in 

 relation to the water supply of Schofield Barracks was continued 

 during the year. 



Other Co-operative Work. 



The flood storage investigation being made in cooperation with 

 the Kahuku and Laie plantations was continued. Other coopera- 

 tive work included about 70 stream and ditch measurement sta- 

 tions, and about 62 rainfall measurement stations on all islands. 

 Many ditch seepage investigations were also made. 



Special Reports to the Governor of Hawaii. 



Special reports were made at the request of the Governor of 

 Hawaii relative to Honolulu's water supply, the quantities and 

 values of Territorial waters of Kekaha, Waimea, North Wailua, 

 South Wailua, Kapaa, and Anahola on the island of Kauai ; the 

 East Maui ditches and the Olowalu and Ukumehame streams on 

 Maui; the Wailuku, Waiakoloa, Waipio, and several other 

 streams and ditches in the Hamakua and Kohala districts on 

 Hawaii. 



A comprehensive report as to Territorial water values was also 

 furnished. 



Waiahole Tunnel Project. 



The Waiahole Water Company's project which was completed 

 in Mav is the largest of its kind in Hawaii, and cost between 

 $2,500^000 and $3,000,000. Its principal feature is a three-mile 

 tunnel which pierces the Koolau range and transmits the waters 



