Does CM1 flood?

CM1 1AE up to High CM1 1DH up to High CM1 1DN up to High CM1 1GD up to High CM1 1LQ up to High CM1 1PD up to High CM1 1SQ up to High CM1 2NX up to High CM1 3ET up to High CM1 3EX up to High CM1 3RL up to High CM1 3RN up to High CM1 3RZ up to High CM1 3SA up to High CM1 4LH up to High CM1 4LL up to High CM1 4PB up to High CM1 4PD up to High CM1 4PZ up to High CM1 4RY up to High CM1 4RZ up to High CM1 4SX up to High CM1 4TZ up to High CM1 7BQ up to High CM1 1BD up to Medium CM1 1BN up to Medium CM1 1FG up to Medium CM1 1FU up to Medium CM1 1GH up to Medium CM1 1LE up to Medium CM1 1PA up to Medium CM1 1PB up to Medium CM1 1PU up to Medium CM1 1SP up to Medium CM1 1TN up to Medium CM1 1TP up to Medium CM1 1TQ up to Medium CM1 1TW up to Medium CM1 2QR up to Medium CM1 2QS up to Medium CM1 2QX up to Medium CM1 2QY up to Medium CM1 2RL up to Medium CM1 3EA up to Medium CM1 3EY up to Medium CM1 3RR up to Medium CM1 4LT up to Medium CM1 1BE up to Low CM1 1BT up to Low CM1 1DA up to Low CM1 1DE up to Low CM1 1DP up to Low CM1 1EJ up to Low CM1 1GL up to Low CM1 1JF up to Low CM1 1JN up to Low CM1 1LG up to Low CM1 1QY up to Low CM1 1RB up to Low CM1 1SL up to Low CM1 1WZ up to Low CM1 1XF up to Low CM1 1XG up to Low CM1 1XL up to Low CM1 1YJ up to Low CM1 1YQ up to Low CM1 2NS up to Low CM1 2QT up to Low CM1 2RS up to Low CM1 2RX up to Low CM1 2RY up to Low CM1 2SJ up to Low CM1 2UD up to Low CM1 3EU up to Low CM1 3SU up to Low CM1 4ED up to Low CM1 4EJ up to Low CM1 4HB up to Low CM1 4HD up to Low CM1 4PA up to Low CM1 4PE up to Low CM1 4PF up to Low CM1 4QL up to Low CM1 4QN up to Low CM1 4SA up to Low CM1 4UA up to Low CM1 2GR up to Very low CM1 2NJ up to Very low CM1 2NL up to Very low CM1 2NR up to Very low CM1 2NT up to Very low