Drainage Regimes — Inside and Interannual Variation of the Drain (HAD)

Map 3.11 shows reference diagrams with the results of frequency analyses of selected Level time series. They contain the QMED standardised to the long-term median flow rate and gliding 20-day smoothed daily values of Quantile Q10, Q25, Median, Q75 and Q90 as a year series in relation to the calendar year. The specified median drain donation QMED gives Indications of the outflow height of the region and allows — together with the curves Reference diagram — the calculation of discharge donations at any time of the year. Via the also indicated catchment area AE, outflows of partial catchments may be located (Q = QMED·AE/1000 in m³/s) or flow at water cross-sections.