Page:Frontinus - The stratagems, and, the aqueducts of Rome (Bennet et al 1925).djvu/445

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Aqueducts of Rome, II. 65–66

A gauging of this aqueduct could not be taken at the intake, since there it consists of two channels. But at The Twins, which is below Spes Vetus,^[1] where it joins with a branch of Augusta, I found a depth of water of 5 feet, and a width of 1 3/4 feet, making an area of 8 3/4 square feet,^[2] twenty-two 100-pipes plus a 40-pipe, which makes 1,825 quinariae,—more than the records have it by 984 quinariae. It was delivering 704 quinariae,—137 quinariae less than credited in the records; and, furthermore, 1,121 quinariae less than given by the gauging at The Twins.^[3] A considerable amount of this, however, is lost by leaks in the conduit, which, being deeply buried, does not clearly exhibit them. And yet their presence is plainly indicated by the fact that in very many parts of the City excellent water is met with, which leaks from that aqueduct. But we also detected some illicit pipes within the City. Outside the City, however, on account of the depth of the level, which at the intake is 50 feet underground, the conduit suffers no depredations.

Old Anio is credited in the records with the amount of 1,541 quinariae. At the intake I found 4,398 quinariae, exclusive of the quantity which is

↑ Cf. 5.
↑ The area of a cross section of the Appia would be 2,240 square digits (cf. 24). The area of twenty-two 100-pipes would be 2,199 square digits (cf. 62), and that of one 40-pipe would be 39·98 square digits (cf. 50), so that the area of a cross section of the Appia would practically equal the sum of the areas of the cross sections of these pipes Now the capacity of twenty-two 100-pipes, 1,791·93 quinariae (cf. 62), added to that of one 40-pipe, 32·58 quinariae (cf. 50), gives approximately 1,825 quinariae as the capacity of the Appia at, that point.
↑ In the Appia (1) actual measurements showed 1,825 quinariae, the records called for 841 quinariae—a discrepancy of 984 quinariae; (2) while the records credited 841 quinariae, only 704 quinariae were delivered, a discrepancy of 137 quinariae; (3) 1,825 quinariae were found by measurement, but only 704 were delivered, a discrepancy of 1,121 quinariae.

391

[1] Cf. 5.

[2] The area of a cross section of the Appia would be 2,240 square digits (cf. 24). The area of twenty-two 100-pipes would be 2,199 square digits (cf. 62), and that of one 40-pipe would be 39·98 square digits (cf. 50), so that the area of a cross section of the Appia would practically equal the sum of the areas of the cross sections of these pipes Now the capacity of twenty-two 100-pipes, 1,791·93 quinariae (cf. 62), added to that of one 40-pipe, 32·58 quinariae (cf. 50), gives approximately 1,825 quinariae as the capacity of the Appia at, that point.

[3] In the Appia (1) actual measurements showed 1,825 quinariae, the records called for 841 quinariae—a discrepancy of 984 quinariae; (2) while the records credited 841 quinariae, only 704 quinariae were delivered, a discrepancy of 137 quinariae; (3) 1,825 quinariae were found by measurement, but only 704 were delivered, a discrepancy of 1,121 quinariae.

[1]

[2]

[3]