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    WW-I-7: Water levels in lakes

    The line chart WW-I-7 ’Water levels in lakes’ indicates the annual deviation of the water level in lakes in two regions – the North German Plain and the Alps-and-foothills for the years 1961 to 2021 from the water level in 2014 in centimetres. The water level of the lakes in the North German Plain receded significantly by 2021 compared to 2014; ultimately the deviation amounted to –20 cm compared to 2014.

    … BE SenMVKU/ BY LfU/ MV MLU/ NI NLWKN/ SH LLUR/ ST LHW (water level measurements) Download image (163.33 kB) The following contents contain this medium: WW-I-7: Water …

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    BD-I-1: Phenological changes in wild plant species

    The illustration contains a stacked column chart which shows the beginning and duration of the phenological seasons for the periods of 1951 to 1980, 1981 to 2010 and 1992 to 2021. This demonstrates that, by comparison, winter has become shorter which also applies to spring and high summer. The early summer has become longer by approximately two days.

    … changes in wild plant species Source: DWD (phenological observation network) Download image (138.01 kB) The following contents contain this medium: BD-I-1: …

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    FW-I-8: Forest fire hazards and forest fires

    The line chart FW-I-8 ‘Forest fire hazards and forest fires’ contains two lines which indicate the development of terrain affected by forest fires in hectares and the mean number of days with fire reports in hazard categories (FWI 4 + 5) at stations in areas with very high to medium forest fire hazards. The terrain affected by forest fires suffered several distinct peaks in the period of 1991 to 2021. In 1992 the affected terrain comprised just under 5,000 hectares.

    … fires Source: BLE (forest fire statistics Germany)/ DWD (regionalised Canadian FWI) Download image (161.16 kB) The following contents contain this medium: FW-I-8: …

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    FW-I-4: Dieback rate

    The line chart FW-I-4 ’Dieback rate’ shows – for the tree species of pine, spruce, beech and oak and for all these tree species combined – the crown defoliation mean in per cent for the period of 1990 to 2021. Up until 2018 the species-specific dieback rate fluctuated between 0.0 and 0.5 per cent. In those years, the dieback rate in respect of oak was mostly slightly higher than that of other tree species. In the years of 2019, 2020 and 2021 the dieback rates of all tree species increased distinctly.

    … FW-I-4: Dieback rate Source: BMEL (nationwide forest condition survey) Download image (124.07 kB) The following contents contain this medium: FW-I-3 + 4: …

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    WW-R-3: Investments in flood protection (case study)

    The stacked columns chart WW-R-3 ’Investments in flood protection – case study’ shows the investments in flood protection in million Euros by the state of Hesse for the years 2000 to 2021. The investments are divided into grants to local authorities for non-technical flood protection (2nd and 3rd order waters), grants to local authorities for technical flood protection (2nd and 3rd order waters), grants for conceptional preparatory work (1st order waters) and grants relating to technical flood protection

    … WW-R-3: Investments in flood protection (case study) Source: HMUKLV (budget account) Download image (94.97 kB) The following contents contain this medium: WW-R-2 + 3: …

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    GE-R-1: Heat warning service

    The bar chart GE-R-1 ’Heat warning service’ illustrates the annual number of newsletter subscriptions for the heat warning service provided by the GWS from 2008 onwards. The number was rising significantly and latterly amounted to just under 15,000 subscriptions. There are no data available for the years of 2018 or 2019.

    … DWD (heat warning service/ records of newsletter subscribers and warnings issued) Download image (62.52 kB) … The bar chart GE-R-1 ’Heat warning service’ illustrates …