隋唐永安渠渠首的福堰遗址吕卓民永安渠是隋唐长安城在城南的主要引水工程之一。渠引交水，经赤兰桥、第五桥等地至郭城南侧，再自大安坊流入长安城内。其具体流向大致是：从渠首先西北流，引水上岸，待渠水援高之后，又转趋东北流以入京城。宋敏求《长安志》载永安渠首有... Yong’an Canal Sui and Tang Dynasties Fuyao ruins Luotuo Min Yong’an Qu Chang’an City, Sui and Tang Dynasties in the south of the main diversion project. Drainage leads to the water, by the bridge, the fifth bridge and other places to the southern Guo City, and then from Grand Ann into Chang’an City. The specific flow direction is roughly: from the first stream northwest flow diversion ashore, until the drainage aid to high, then turn northeast flow into the capital. Song Min seeking “Changan Chi” contains Yongan canal head ...