Does GL1 flood?

GL1 2BL up to High GL1 2BS up to High GL1 2BX up to High GL1 2BY up to High GL1 2BZ up to High GL1 2DN up to High GL1 2ET up to High GL1 2FA up to High GL1 2GB up to High GL1 2HY up to High GL1 2JN up to High GL1 2JQ up to High GL1 2JS up to High GL1 2PX up to High GL1 2QP up to High GL1 2QR up to High GL1 2QW up to High GL1 2RN up to High GL1 2RU up to High GL1 2RX up to High GL1 2RY up to High GL1 2RZ up to High GL1 2SA up to High GL1 2TZ up to High GL1 3AX up to High GL1 4AS up to High GL1 4AW up to High GL1 4BH up to High GL1 4BJ up to High GL1 4BL up to High GL1 4DD up to High GL1 4DG up to High GL1 4EA up to High GL1 4NY up to High GL1 4UR up to High GL1 4UU up to High GL1 1AN up to Medium GL1 1AP up to Medium GL1 1AQ up to Medium GL1 1DH up to Medium GL1 1DS up to Medium GL1 1DT up to Medium GL1 1EN up to Medium GL1 1EP up to Medium GL1 1EQ up to Medium GL1 1EW up to Medium GL1 1JJ up to Medium GL1 1JS up to Medium GL1 1JZ up to Medium GL1 1LF up to Medium GL1 1LG up to Medium GL1 1LH up to Medium GL1 1LN up to Medium GL1 1LQ up to Medium GL1 1LR up to Medium GL1 1LS up to Medium GL1 1LT up to Medium GL1 1LW up to Medium GL1 1LY up to Medium GL1 1NA up to Medium GL1 1NE up to Medium GL1 1PX up to Medium GL1 1PY up to Medium GL1 1QB up to Medium GL1 1QD up to Medium GL1 1QE up to Medium GL1 1QF up to Medium GL1 1QN up to Medium GL1 1QT up to Medium GL1 1QX up to Medium GL1 1QY up to Medium GL1 1QZ up to Medium GL1 1RA up to Medium GL1 1RD up to Medium GL1 1RL up to Medium GL1 1SL up to Medium GL1 1SZ up to Medium GL1 1UY up to Medium GL1 1UZ up to Medium GL1 1XB up to Medium GL1 1XE up to Medium GL1 1XR up to Medium GL1 1YH up to Medium GL1 2BH up to Medium GL1 2DW up to Medium GL1 2EH up to Medium GL1 2EZ up to Medium GL1 2JD up to Medium GL1 2JP up to Medium GL1 2JX up to Medium GL1 2LE up to Medium GL1 2PW up to Medium GL1 2PZ up to Medium GL1 2QA up to Medium GL1 2QE up to Medium GL1 2QF up to Medium GL1 2QS up to Medium GL1 2QX up to Medium GL1 2RB up to Medium GL1 2RE up to Medium GL1 2RF up to Medium GL1 2RG up to Medium GL1 2RL up to Medium GL1 2RQ up to Medium GL1 2RR up to Medium GL1 2SQ up to Medium GL1 2SZ up to Medium GL1 2TA up to Medium GL1 2TF up to Medium GL1 2TU up to Medium GL1 2UJ up to Medium GL1 4AE up to Medium GL1 4AG up to Medium GL1 4AN up to Medium GL1 4AP up to Medium GL1 4AQ up to Medium GL1 4AR up to Medium GL1 4AT up to Medium GL1 4AU up to Medium GL1 4AX up to Medium GL1 4BB up to Medium GL1 4BG up to Medium GL1 4BP up to Medium GL1 4BW up to Medium GL1 4DE up to Medium GL1 4DL up to Medium GL1 4DS up to Medium GL1 4DW up to Medium GL1 4DZ up to Medium GL1 4EB up to Medium GL1 4EE up to Medium GL1 4EF up to Medium GL1 4EL up to Medium GL1 4EN up to Medium GL1 4FB up to Medium GL1 4HR up to Medium GL1 4NE up to Medium GL1 4NH up to Medium GL1 4NJ up to Medium GL1 4NN up to Medium GL1 4NP up to Medium GL1 4NQ up to Medium GL1 4NR up to Medium GL1 4NS up to Medium GL1 4NT up to Medium GL1 4NU up to Medium GL1 4PL up to Medium GL1 4SP up to Medium GL1 4SR up to Medium GL1 4SS up to Medium GL1 4ST up to Medium GL1 4SU up to Medium GL1 4SX up to Medium GL1 4SY up to Medium GL1 4SZ up to Medium GL1 4TA up to Medium GL1 4UD up to Medium GL1 4UH up to Medium GL1 4UJ up to Medium GL1 4UL up to Medium GL1 4UN up to Medium GL1 4UP up to Medium GL1 4UQ up to Medium GL1 4US up to Medium GL1 4UW up to Medium GL1 4UX up to Medium GL1 4UY up to Medium GL1 4UZ up to Medium GL1 4XA up to Medium GL1 4XB up to Medium GL1 4XD up to Medium GL1 4XE up to Medium GL1 4XF up to Medium GL1 5AA up to Medium GL1 5AN up to Medium GL1 5AQ up to Medium GL1 5AT up to Medium GL1 5AU up to Medium GL1 5AX up to Medium GL1 5AY up to Medium GL1 5AZ up to Medium GL1 5BA up to Medium GL1 5BD up to Medium GL1 5BG up to Medium GL1 5BH up to Medium GL1 5BJ up to Medium GL1 5RY up to Medium GL1 5SF up to Medium GL1 1HX up to Low GL1 1HZ up to Low GL1 1RE up to Low GL1 2AA up to Low GL1 2BT up to Low GL1 2BW up to Low GL1 2DQ up to Low GL1 2EN up to Low GL1 2ES up to Low GL1 2FE up to Low GL1 2LG up to Low GL1 2LW up to Low GL1 2LX up to Low GL1 2PA up to Low GL1 2PB up to Low GL1 2PG up to Low GL1 2PH up to Low GL1 2PS up to Low GL1 2PU up to Low GL1 2PY up to Low GL1 2QD up to Low GL1 2QG up to Low GL1 2QH up to Low GL1 2QJ up to Low GL1 2QL up to Low GL1 2QN up to Low GL1 2QQ up to Low GL1 2QT up to Low GL1 2QY up to Low GL1 2QZ up to Low GL1 2RD up to Low GL1 2SB up to Low GL1 2SG up to Low GL1 2SL up to Low GL1 2SR up to Low GL1 2TB up to Low GL1 2UE up to Low GL1 2UN up to Low GL1 3AA up to Low GL1 3AJ up to Low GL1 3AT up to Low GL1 3AU up to Low GL1 3BJ up to Low GL1 3BL up to Low GL1 3BU up to Low GL1 3BZ up to Low GL1 3DA up to Low GL1 3LW up to Low GL1 4DH up to Low GL1 4LW up to Low GL1 4NL up to Low GL1 5HB up to Low GL1 5HD up to Low GL1 5HG up to Low GL1 5QE up to Low GL1 5QF up to Low GL1 5SG up to Low GL1 5SJ up to Low GL1 5SQ up to Low GL1 5SR up to Low GL1 5SS up to Low GL1 5SY up to Low GL1 5TA up to Low GL1 5TT up to Low