Savaria - A Vas Megyei Múzeumok értesítője 30. (2006) (Szombathely, 2007)

Régészet - Anderkó Krisztián: Savaria vízvezetéke

Anderkó Krisztián: Savaria vízvezetéke To be noted that if the inclination of the channel between Sé and Szombathely had been lower than the those of the sections known currently, the average inclination must have dropped, which may have somewhat reduced daily output rates. This, however, may not have been significant, because if we compare the altitude point of the section recovered in the Bozsoki Valley with the assumed end point, we receive a relief difference ofcc. 165 meters, which implies a value of6,6%o, if calculated by a length of

25 kms. This hypothetic result far exceeds the inclination of the aquaeductuses listed in the chart. Of course, the future excavations to be organized between the tested sections located in relatively far distances from each other might modify the calculations for the performance. The data hereinabove have been calculated on the basis of the maximal utilization of the clearance, which means that water filled the channel clearance up to the top of the aquifer layer. On the contrary, half of the tiled clearance was used ideally (HODGE 1992: 225, Fig. 157). In case of the aqueduct in Trier, the crucial wear of the aquifer terrazzo allowed to conclude that the water current filled approximately two-third of the clearance (NEYSES 1980: 22, Fig. 25). The wear and scaling process observed in Bucsu impacted the lower 40 to 45 cms range of the channel clearance, based on which we assume that the real water output (Q) was lower with 40 to 50%, than the value calculated hereinabove. At the same time, it has been demonstrated in case of the urban Anio Novus aqueduct in Rome that water filled the pipe clearance (122x.274cm) somewhere between 50 and 220 cms owing to the varying inclination (flow velocity = v) (HODGE 1992: 227, Fig. 158). Referring to the foregoing we assume that the experiences gained in Bucsu are effective to this phenomenon and not to the entire channel. The water quantity running through the aquaeductus can be extrapolated by another approach/ method. Based on the data recorded by Tiirr, the water output of Creek Bozsoki was 10—12 Us (TÜRR 1953: 130), whilst only 1.3—2.17 Us of water flowed out of the Roman water channel cut through in 1974 (PACHNER 1975: 1). Based on tests, Creek Rohonci supplied a quantity of 1.900 rrflday in case of low water level and 2.150 nP/day in case of medium water level (TÜRR 1953: 132), which equals to a quantity of 21.3—24.89 Us. To sum up the data we receive a quantity ofapp. 35—40 lls—t (= 0.04 tn?/s), which means an output of3.

456 m

3 per day, which implies an amount of

345,61 per capita per diem projected on a population including a hypothetic density of 10.000 in the Roman Age. These results are far beyond the available capacity (permeability), at the same time, if service connecting channels have been recovered in Sé and in Narda, the water level within the channel could have been increased easily. 46