In a catchment area in northern England, the measurements of evaporation (mm) shown in the Table 2 .11 were made for 195 8–1962 and 196 8–1972. For the years 196 8–1972, measurements from the US Class A pan only were available. Estimate the volume of water lost each year in the later period from a reservoir of surface area of 1 .4 km 2 .

Table  2 .11

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Measurements of Evaporation for 1958-1962 and 1968-1972 for Problem 6 Year U.K. Tank U.S. Class A Pan Year U.S. Class A Pan 1958 351 491 1968 621 1959 536 713 1969 581 1960 502 653 1970 687 1961 437 586 1971 624 1962 486 612 1972 568