The first part of 'Flood', in which Suchet, Courtenay and Robert Carlisle battled to stop London becoming part of the North Sea, attracted 7.2m viewers on Sunday night and a 29.8% share of the 8pm audience.
The second part on Monday night dropped to 6.2m and a 28% share, but still won its slot.
The drama was up against Channel 4's 'Grand Designs Live', a week-long programme in which Kevin McCloud faces the challenge of building an eco-home in six days.
It kicked off on Sunday night with 1.9m viewers and a 7.9% share of the 8pm audience. Including Channel 4+1 ratings this increased to 2.1m and an 8.4% share.
The second part of the show on Monday night fared slightly better pulling in 2m viewers and a 7.9% share of the 9pm audience. This increased to 2.1m and an 8.3% share including Channel 4+1 figures.
BBC One's popular drama 'Waking the Dead' was beaten by 'Flood' on Monday night, but still drew in 6.1m viewers and a 24.5% share of the 9pm audience.
On Saturday night, ITV1's 'Britain's Got Talent' won its slot pulling in 8.5m viewers and a 39% share of the 8pm audience. This was lower than the previous week when it managed 9.4m viewers and a 41.2% share.
ITV's US quirky import 'Pushing Daisies', starring Anna Friel, continued to lose viewers with 3.1m tuning in and a 14.8% share of the 9pm audience, compared with 3.8m last week and a 17.5% share.
ITV weathered a storm of protests over its decision not to air the second episode of the nine part series, which had already been cut short by the US writer's strike.
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