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available in an advisory capacity relative to Territorial waters. 

 Nine days were spent on the ground, and visits were made to 

 the Waimea canyon, Kekaha, Kanaha, Kapahi, Lihue and Hana- 

 maulu ditches, and the headwaters of the North Wailua, Kapaa 

 and Anahola streams. 



HILLEBRAND GLEN RUN-OFF. 



At the request of the Governor of Hawaii, the construction of 

 a weir and continuous record-measurement station to measure 

 the run-off from Hillebrand Glen was started. This station will 

 measure the water which might be diverted by the proposed ditch 

 into Reservoir No. 4. 



. OPERATION AND MAINTENANCE. 



Kauai. Several miles of trails in the North Wailua, Waioli 

 and Wainiha valleys, which were badly blocked and damaged by 

 the December and January storms, were cleared and repaired. 

 The same operations were continued on the trails in the upper 

 Kalihiwai and Hanalei valleys. 



Repairs and improvements were made to the continuous-record 

 stream-gaging stations on the Olokele, Anahola, Waioli and upper 

 and lower Wainiha streams. 



W. V. Hardy, assistant engineer, spent 20 days in the field, 

 visited 22 stream and ditch-measurement stations, and made 21 

 measurements. 



D. E. Horner, field assistant, spent 24 days in the field, visited 

 nine stream and ditch measurement and seven rain-gaging sta- 

 tions, and made 12 measurements. 



Oahu. Only routine operation and minor repair work was 

 done. 



Maui. Two new foot suspension bridges were rebuilt in the 

 Waihee Stream in order that the stream-gaging station might be 

 reached during floods. Seven staff gage stations which were 

 destroyed by the December and January floods were re- 

 established and minor repairs were made at several stream and 

 ditch-gaging stations. Twenty-nine stream and ditch-gaging and 

 one rain-gaging stations were visited and 22 measurements were 

 made. 



Very respectfully, 



G. K. Larrison, 

 Superintendent of Hydrography. 



