Plate 5.2 Discharge Regime – the Basis for the Estimation of Average Flows

In regions with no discharge measurements, one must rely on estimating flow characteristics. The discharge regimes which appear on the map provide the basis for estimating long-term average monthly flows. The long-term average seasonal variations of runoff will be referred to in this work as «regime» in accordance with the classical use of the term. For the purposes of classification and regionalisation of the regimes, approximately one hundred catchments were selected from the hydrological network of the federal government, the cantons and private institutions. These catchments are between 10 and 500 km² in area, have natural discharge not influenced by the presence of large lakes, and have homogeneous, long-term measurement series.在无流量监测资料的区域，需通过估算手段获取径流特征。地图上标注的径流情势（discharge regimes）可作为估算长期平均月径流量的基础。本研究遵循该术语的经典使用惯例，将径流的长期平均季节性变化统称为“径流情势（regime）”。为对径流情势进行分类与区域化研究，本研究从联邦政府、各州及私人机构的水文站网中遴选了约一百个流域。这些流域的面积介于10至500平方千米之间，其天然流量不受大型湖泊影响，且具备均一的长期实测径流序列。