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Environmental Sciences Europe
Fig. 3 | Environmental Sciences Europe

Fig. 3

From: Much effort, little success: causes for the low ecological efficacy of restoration measures in German surface waters

Fig. 3

Mean grain size and classification of sediments (a) according to [136] and mean fine sediment depth (b) in the river Horloff. Dashed arrows mark the outflow of the last of the four small wastewater treatment plants (WWTPs) downstream of site 4 in the upper reach of the Horloff and of the WWTP Wölfersheim downstream of site 19. The solid arrow marks the outflow of the large WWTP Hungen-Utphe downstream of site 14. Hatched bar: reference site 16 in the space-for-time-substitution approach to account for differences to sites 17 and 18 within the restoration section (dark green bars) and to transect sites (light green bars) downstream of the restoration section

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