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In this paper the two analytical models which predict damage, post-earthquake restoration strategies and its period of water supply pipeline network are presented. The detailed model evaluates emergency restoration period of water supply pipeline network using the actual network data and the several restoration strategies that was provided from the experiences of past earthquakes. The simplified model also evaluates restoration period by strategy restoring from the side of distribution reservoir using the 1 km grid data of pipeline length of pipe type and diameter estimated from population data of reference area and water-supply pipeline expansion data. Using actual data of water supply pipeline network of three waterworks bureaus in Japan, we studies the accuracy of grid data of the proposed pipeline length modeling of the simplified model. Finally the efficiency and accuracy of approximate restoration period using the simplified model are confirmed by comparing with the results of two models about damage estimates and restoration periods.

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