Plate 5.5 Influence of Civil Engineering on Rivers and Lakes

The 1:1 100 000 scale maps are intended to show to what extent the watercourses in Switzerland were still in a natural state or had been modified by the middle of the 19th century and by 1990. Since the scale of the maps is small, only the larger rivers and streams have been included. The tables indicate the bases used and provide further references.本批1:10万比例尺地图旨在展示，截至19世纪中叶与1990年两个时间节点，瑞士境内河道仍维持自然状态，或是已被人工改造的程度。鉴于该比例尺地图的覆盖范围有限，本次数据集仅纳入了规模较大的河流与溪流。附录表格说明了本次数据集所采用的编制依据，并提供了进一步的参考资料。