1917] EUBAL ENGINEERING. 185 



It was found that " the amount of rain falling in a certain season influ- 

 ences the agricultural load in the succeeding mouths; thus when there is a 

 season of heavy rainfall it is followed by a season of proportionally light irri- 

 gation and, therefore, of poor load factor on pumping iilants, and vice versa. The 

 time at which the rainfall occurs is also of importance. Thus, early fall rains 

 during the mouths of September. October, and November will cause a rapid 

 decrease in the pumping load at that time, while the late spring rains in March, 

 April, and May will similarly delay the rise of the spring peak, both of which 

 result in a decreased load factor and decreased total consumption. A con- 

 centration of the precipitation during the months of December, January, and 

 February results in less penetration and replenishment of ground water and a 

 greater run-off. This will result in an increase in the total annual consumption 

 and load factor." 



The normal average power consumption for the locality was found to be 

 about 435 kilowatt hours per liDrsepower of plant capacity per annum. 



Description of water wheel at Kudai'angan Agricultural School, A. E. 

 Haley {[Fhilipinne] Bur. I'lih. Works Quart. Bnl., 5 (1916), No. 1, pp. 22, 23, 

 Jig. 1 ; aha. in Engin. Keirs, 76' (1016), No. 9, pp. .'f09, .'ilO, fig. 1). — A water wheel 

 for irrigation in the Philippine Islands is describetl and diagi-ammaticaliy 

 illustrated. 



"Measurements of the wheel show that it raises about 25 gal. pev minute, 

 or 40,000 gal. per day, while operating in water flowing three miles per hour. 

 Each bucket carries 4 gal. of water and the wheel makes a complete revolution 

 in 70 .seconds. The water raised is suflicient to irrigate about 1.5 hectares [3,7 

 acres] of ground." 



A complete method for the classification of irrigable lands, F. H. Peteks 

 {Proc. Anier. Soc. Civ. Etujin., 1,2 (1916), Xo. 7. pp. 1231-1251, pi. 1, figs. 7).— 

 This paper deals with the classification by the Dominion Government of an 

 area of about 1,037,000 acres of irrigable land developed in the Province of 

 Alberta. The climatic, soil, and crop conditions i)f the area are described and, 

 as governed by these, the basis of the classification is stated as follows : 



"Laud shall be classified as irrigable (1) if it lies at a lower elevation than 

 the point of delivery, after allowing a reasonable grade for a farm lateral. 

 The point of delivery shall be deemed to be a point 3 in. below the crest of the 

 measuring weir at or within the farm boundary. Where this measuring weir 

 is not at or within the farm boundary, the point of delivery shall be the eleva- 

 tion of full supply level in the lateral supplying the field outlet and all meas- 

 uring weirs shall be built in accordance with the plan of farm weirs filed with 

 the commissioner of irrigation and dated November 1, 190S. The grade of 

 farm laterals when a factor in land classification will be considered reasonable, 

 (a) where the natural slope of the ground is less than 0.1 ft. in 100 ft. at a rate 

 not less than 0.05 ft. in 100 f c. ; (b) where the natural slope of the ground is 

 greater than 0.1 ft. in 100 ft. at a rate of not less than 0.1 ft. in 100 ft. ; and 

 (c) where the slope of the ground is at or near the critical slope of 0.1 ft. in 

 100 ft. at either of the grades mentioned in clauses (a) and (b), such as good 

 and reasonable practice demands. Extremely flat country may be irrigated by 

 checks and flooding, and the grade of the farm lateral need not be considered 

 in such cases, it being understood that the minister of the interior, or officers 

 appointed by him, shall be the final judges of what constitutes ' extremely flat 

 country.' 



"(2) If such land can be reached by an estimated concentrated expenditure 

 at one or more points for embankments, flumes, etc., not in excess of $8 per 

 acre for the land to be served and benefited through them. (8) If such land 



