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Volume 10 (3); 25 May, 2020


extreme_rainfall_by_GEV_EV1_EV2_and_GPAResearch Paper

Comparison of Estimators of Probability Distributions for Selection of Best Fit for Estimation of Extreme Rainfall.

Vivekanandan N.

J. Civil Eng. Urban., 10(3): 24-31, 2020; pii:S225204302000004-10

DOI: https://dx.doi.org/10.29252/scil.2020.jceu4

Abstract
Extreme Value Analysis (EVA) of rainfall is considered as one of the important aspects to arrive at a design value for planning, design and management of civil and hydraulic structures. This can be achieved by fitting Probability Distribution (PDs) to the series of observed annual 1-day maximum rainfall data wherein the parameters of PDs are determined by method of moments and L-Moments (LMO). In this paper, a study on comparison of Extreme Value Type-1 (EV1), Extreme Value Type-2, Generalized Extreme Value (GEV) and Generalized Pareto distributions adopted in EVA of rainfall for Anakapalli, Atchutapuram, Kasimkota and Parvada sites is carried out. The selection of best fit PD for EVA of rainfall is made through quantitative assessment by using Goodness-of-Fit (viz., Chi-square and Kolmogorov-Smirnov) and diagnostic (viz., root mean squared error) tests; and qualitative assessment by using the fitted curves of the estimated rainfall. On the basis of evaluation of EVA results through quantitative and qualitative assessments, the study indicates the extreme rainfall given by EV1 (LMO) distribution could be used for the purpose of economical design. The study also indicates the extreme rainfall obtained from GEV (LMO) distribution may be considered for the design of civil and hydraulic structure with little risk involvement.
Keywords: Chi-square, Extreme value analysis, Extreme Value Type-1, Kolmogorov-Smirnov, L-Moments, Method of moments, Rainfall, Root mean squared error

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Yenidere_Timeles_waterwayShort Communication

Historical Water Conveyances to Aphrodisias and the Yeşilköy-Kayapinar Water Tunnel.

Daneshfaraz R and Alkan A.

J. Civil Eng. Urban., 10(3): 32-34, 2020; pii:S225204302000005-10

DOI: https://dx.doi.org/10.29252/scil.2020.jceu5

Abstract
Anatolia is considered as one of the foremost open-air museums of the world with regard to historical hydraulic works. The antique city Aphrodisias, near the settlement Geyre at the Karacasu District in the Aydın Province of Turkey, was supplied from two regions by long-distance water conveyance systems: (a) the 22 km long Yenidere (Timeles) water conveyance supplying the springwater near the village Güzelköy of the Tavas District in the Denizli Province, from the south-east (the conveyance from Sekiköy joined probably this system); (b) the 9 km long Işıklar water conveyance supplying the springwater near same-named village of the Karacasu District of the Aydın Province, from the north-west (the conveyance from Derindere springs joined probably this system). The Yenidere (Timeles) water conveyance is one of the rarely encountered historical example of water transfer between adjacent basins; and moreover, the length of the tunnel, of roughly 1% slope and 1m3/s capacity, digged with the ‘qanat’ system, is about 5 km from the entrance in the south-west of Yeşilköy and the outlet in the north-east of the village Kayapınar, and ranks among the longest ones of its kind in the antique world. This water conveyance system, especially the above mentioned tunnel section, which has a special place among the historical water works in Turkey, should be carefully investigated, duely repaired, and preserved for the future according to its international relevance.
Keywords: Aphrodisias, Yenidere dam, Timeles, Waterways

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