1920] 



RURAL ENGINEERING. 



477 



Report of the Water Conservation and Irrigation Commission for the 

 j-ear ended June 30, 1919 (N. S. Wales, Rpt. Water Conserv. and Jrrig. 

 Comn., 1919, pp. S'f). — Data on the works and expenditures of the Water Con- 

 servation and Irrigation Commission of New South Wales for the year ended 

 June 30, 1919, are reported, covering irrigation areas establislied and controlled 

 by the State, proposed irrigation areas, private and State water conservation 

 works, and artesian and shallow well boring. 



Administration report for tlie [fiscal] year 1918-1919, W. J. .T. IIowlky 



ind K. R. S. Rau {Madras Pres. [India], Irrig. Branch, Admin. Rpt. 1918-19, 



fpt. 2, pp. VIII-\-206, pi. 1). — The expenditures on and revenues derived from 



Government irrigation works in the Madras Presidency for the year 1918-1919 



are reported in detail. 



Another diagram for solving the Planning hydraulic formula, R. D. 

 GoouRicii {Enyin. Neics-Rec, 83 {1919), No. U, pp. 648, 6>,9, fig. 1).—K metric 

 logarltiimic diagram for solving the Manning hydraulic formula is given, which 

 was used in the hydraulic computations involved in the investigation of river 

 and flood channels preliminary to the design of the system for the reflation 

 of the rivers of the Province of Chili, China. 



It is noted that for hydraulic radii between 0.4 and 3 meters, with slopes 



[from 0.0001 to 0.01, this diagram will give practically the same results for all 



[Values of n as diagrams for the Kutter formula. It will also check very closely 



for flatter slopes when n does not exceed 0.015, and may therefore be useful in 



[the design of sewers, aqueducts, or irrigation flumes. 



Computation of the coefficient of discharge of Venturi meters, W. S. 



^Pardoe {Engin. News-Rec, 83 {1919), No. 13, pp. 600-608, figs. 6).— The results 



Jf tests conducted at the University of Pennsylvania on meters ranging in 



iameter from 0.625 and 0.405 in. to 16 and 8 in. are reported. 



It is believed that the most important constructional feature of Venturi 



leters is a perfect brass or noncorrosive throat piece with proper piezometer 



jnnections and a constant ratio of length to diameter of throat, preferably 



Fone-half. The graphic data reported indicate that coefficients may be com- 



[puted to wilbin 0.5 per cent of experimental values. 



Duty of water when irrigating by pumping, J. Narayanamurti {Madras 

 \Agr. Dept. Yearbook, 1919, pp. 55-68). — Considerable data on duty of water on 

 [the black alluvial soils of the Kistna Delta when irrigating by pumping are 

 tsnmmarized, it being shown that, roughly speaking, the number of acres that 

 [can be cultivated by a pump is equivalent to its discharge in gallons per minute 

 [divided by 10. 



Flooding and furrow irrigation in Coimbatore, R. C. Wood and K. Rag- 



HAVA AcHARYA [Madras Agr. Dept. Yearbook, 1919, pp. ^2-54). — Experiments 



[with well-water irrigation under conditions of considerable heat and evapora- 



ition are reported, showing that a given quantity of water, provided it is not 



excessive, can be applied to a crop more economically by running it along 



furrows than by flooding beds or checks. However, the actual quantity of 



[water that can be applied at a single irrigation is less with the furrow system 



[than with the flooding system, and if a crop requires a heavy irrigation it is 



[better to flood, because the quantity of water needed can only be given by 



inumerous small waterings with the furrow system, with the attendant loss by 



[evaporation and waste (»f labor. 



For conditions at Coimbatore it is concluded that the system can be recom- 

 ' mended for ragi grown in the monsoon, but not for wheat or sorghum. 



Reclamation and irrigation combined, A. Privat {An. Soc. Rural Argen- 

 tina, 52 {1918), Nos. 7, pp. 409-422; 8, pp. 483-495, figs. 51).— An extensive sys- 



