376 



this Division from the next Legislature in order that all prelim- 

 inary work may be completed by the time the present land lease 

 terminates in December, 1920. 



HILO FAIR EXHIBIT. 



An exhibit was prepared and shown at the Hilo Fair during 

 the period September 21 to 24. This consisted of: 



1. A model sharp-crested weir and recording instrument 

 which actually measured flowing water. 



2. Illuminated transparencies showing the structures used in 

 diverting, measuring and utilizing water : the effects of foresta- 

 tion and deforestation on stream flow, etc. 



3. Standard instruments and rain gages used by the Division. 



4. Sample forms showing the development of data f/rom 

 gage heights and measurements to published data. 



5. Photographs of irrigation structures on the mainland. 



6. Plans and photographs of Venturi meters and flumes. 



7. Publications and maps. 



It is estimated that the exhibit was visited by at least ten thou- 

 sand persons. 



MAINTENANCE AND OPERATION. 



Kauai. Mr. Hardy spent ten days with the Superintendent 

 investigating possible flood storage sites on the upper Waimea 

 River catchment area. 



A cable station was established on the Kawaikoi to replace the 

 old suspension foot bridge, used for flood measurements, which 

 was worn out. 



All trails in the upper Waimea drainage area were cleared and 

 improved. 



Nineteen stream and ditch and 10 rainfall-measurement sta- 

 tions were visited and 21 stream measurements were made. 



Oahu. Twenty-six stream and ditch and five rainfall-meas- 

 urement stations were visited and ten stream measurements were 

 made. 



Maui. Twenty-six stream and ditch and one rainfall-meas- 

 urement stations were visited and 21 stream measurements were 

 made. 



ADDITIONAL QUARTERS RENTED. 



Room No. 5 of the Kapiolani Building was rented on Sep- 

 tember 25 at $10.00 per month for an additional workshop and 

 store room. 



Very respectfully, 



G. K. Larrison, 

 Superintendent of Hydrography. 



