Risk of water quality impairment during construction is significantly reduced by almost all works being done on dry land, behind coffer dams and use of appropriate mitigation measures. During operations The small size of the head pond means maximum water residence time of 4 hours so almost no change in water quality. Sediment retention will be minimal after 2-3 years of operation so scouring or flushing operations to remove sediemnt build up will not be necessary.