Chap. IV.
ROMAN.
175
thoroughly understood the properties of running water. This aqueduct received twostreams, which flowed from near the Via Sublaceni , a road which follows the valley of theAnio , above Tivoli. Its total length was 46,406 Roman paces, 36,230 subterranean, and10.176 on arches.
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Fig. 201.
The other was the Anio Novus, the most considerable and curious in its construction.It was in length 58,700 Homan paces, 49,300 under ground, 9400 above, and 6491carried on arches, some of which exceed in height 100 feet. Before the water wasadmitted into this aqueduct, it passed through a reservoir, where the sediment wascollected. Both these aqueducts, after passing on arches and under ground, were united,although the waters w*erc kept separate.
The Tiber, at Rome , was considered to be 91$ feet above the level of the Mediterranean;and the various heights above the level of the Tiber there that these several aqueductsdelivered their water may be thus stated.
Feet.
158*88
148-9
129-4
125-4
82-5
34*2
27-4
The Anio Novus was above the level of the Tiber
The Aqua ClaudiaThe Aqua JuliaThe Aqua MarciaThe Anio VetusThe Aqua VirgoThe Aqua Appia
The nine aqueducts which supplied Ron:to have furnished a quantity as follows: —
4398 quinaria*4690
1398
2524
14018
4607
4738
The Aqua Alsietina
For construction and architectural arrangement the most beautiful was the AquaClaudia , built entirely of squared stone ; that of Marcia, which ran almost parallel withit, had its arches 16 feet span, constructed of different kinds of stone, red, brown, andyellow; the waters were conducted in canals, one above the other, and the arches in manyplaces were more than 70 feet in height. Others were of brick and marble, subject todilapidations, and cost vast sums to repair.
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'3 u 1
Fig. 202. section.
PLAN OF KESEItVOiU.