ON DOLGARROG DAM DISASTER. 



279 



Sketch-map of Llyn Eigiau and Afon Porth-lKvyd, Dolgarrog, showing the ' stages ' 

 referred to in the Report. Contours at 50-feet intervals on flanks only of valley 

 of Afon Porth-llwyd. 



The cross-hatched part of Llyn Eigiau shows the extent of the lake before the 

 upper dam was constructed. It is approximately the present (or post-flood) outline also. 



