Analysis of regional runoff-______________________ Streamflow variability_____________________ Streamflow expressed in units of standard deviation ____ _________________________________ Regional runoff characteristics.________--____-__-_ Streamflow as indicated by tree rings____________ Problems of correlation______________________ Results of correlation studies.________________

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IRRIGATION IN INDIA. 455 hundred thousand separate masonry works. Some of the tanks and reservoirs were on an immense scale, for irrigating many thousand acres, while there were smaller tanks, wells, and springs, which watered only a few acres. I n a report made in 1853 by the late Colonel Baird Smith, of the Bengal Engineers, it-is stated that " The Ponairy ') tank ((in Trichinopoly, with its embankment of 30 miles in length and probable area of 60 or 80 square miles, now lost to the community, and the Veeranum tank, with its 12 miles of embankments and 35 miles in area, happily still in full operation, and securing at this time, after an existence of almost fabulous duration, an annual revenue of 114,500 rupees, or &11,450, to the Government." PI.ATE 2 0. CALINCULAH, OR WASTE WEIR.

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