Table 4

1 January 2000

Table 4, Qualitative comparison of the environmental performance of a linked-basins TPP at Fundys Shepody Bay (HB) and Cumberland Basin(LB), vis--vis the chosen standard of comparison, a single-basin, DE-TPP, Type Z, at Fundys Cumberland Basin. The tabulation shows which of the two types scores highest for optimum environmental performance.NOTE:Re D, Sea-mammal survival: TPPs should be designed and operated to keep sea mammals away from the hydraulic turbines. This applies equally to both linked-Bs and Type Z and therefore does not affect a comparison between them.DE = double-effect; SE = single effect; HB = high-basin; LB = low-basin Linked-Bs = linked-basins

Environmental effects			A	B	C	E	F
Type of TPP	Linked-basins, SE, Fundy (HB and LB)	Single Basin, DE at Fundy (LB)
TPP parameters
Mean, natural tidal range	10.m	10m
Mean tidal range within high basin as % of natural tide	34 %	68 %	Z	Z			Z
Mean tidal range within low basin as % of natural tide	36%	68%	Z	Z			Z
Mean water level within high basin, compared to natural conditions	+2.9m	-0.12m		Z		Z
Mean water level within low basin. compared to natural conditions	-2.6 m	-0.12m		Z		Linked-Bs
Number of passes through turbines, for a fish going in-and-out of TPP	1	2			Linked-Bs
Plant operation at or close to the rhythm of the natural tide	no	yes					Z
Maximum head across turbines	6.96m	4.62m			Z
Maximum water velocities through turbines	15.6m/sec	11.9m/sec			Z
Stagnant flow within high basin % of the time	42%	18%	Z
Stagnant flow within low basin.% of the time	42%	18%	Z
Simplicity of flow patterns	See Fig. 5		Z
Total scores for Iinked-Bs, SE-TPP			0	0	1	1	0
Total scores for Type Z (DE) plant			5	4	2	1	3

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