LISFLOOD Reservoirs and Lakes layer can be found under the menu STATIC. It shows the location of reservoirs (green) and lakes (purple) in LISFLOOD model. 

Figure - LISFLOOD Reservoirs and Lakes layer in EFAS-IS.

The layer can be combined with the LISFLOOD Drainage Network layer (also in menu STATIC) to gain a better understanding of LISFLOOD modelling in EFAS.

Figure - LISFLOOD Reservoirs and Lakes and LISFLOOD Drainage Network layers in EFAS-IS.