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一、概述海门、南通、启东三县的通东地区统称为通吕水脊区。这一带地形较高,水位受引江潮位影响,涨落变幅大,群众生产、生活一般从甲沟(标准相当于海门县中南部地区的中沟)直接取水。在小汛低水位或冬春枯水位季节,甲沟水位随外河水位一起下降,造成群众生产、生活用水困难。以前为了解决矛盾,在甲沟与横河联接处建造蓄水涵洞,以拦蓄降雨径流。这种涵洞洞底高程设得较高,在干旱季节,甲沟水位下降,虽外河水位较高,却引不进水,同时经常遇到排涝与蓄水之间的矛盾。另外高涵洞使出口跌差加大,涵洞出口流速大,淘刷外河河床,使涵洞出口倒塌,甚至整座洞毁坏。
I. Overview Haimen, Nantong, Qidong three counties Tung Tung area collectively referred to as Tonglu Shui Ridge area. In this area, the terrain is relatively high. The water level is affected by the tide of the river. Fluctuations and changes are large. The mass production and livelihood usually take water directly from a ditch (standard equivalent to Zhonggou in south-central part of Haimen County). In the small flood season or the winter and spring low water season, the water level of the gully falls with the water level of the river, causing the masses to produce and use water. In the past, in order to resolve the contradiction, a water storage culvert was constructed at the Jiagou and Yokogawa junctions to intercept rainfall runoff. This culvert cave elevation set higher, during the dry season, a decline in water level, although the river water level is high, but not water, often encountered the contradiction between drainage and water storage. In addition, the high culvert makes the export drop worse, and the culvert exit has a large flow rate, scouring the outer riverbed, causing the culvert exit to collapse and even the entire hole to be destroyed.