Does SY1 flood?

SY1 1AD up to High SY1 1JT up to High SY1 1PF up to High SY1 1PG up to High SY1 1RX up to High SY1 1TN up to High SY1 1TR up to High SY1 1TS up to High SY1 1UD up to High SY1 1XF up to High SY1 1XH up to High SY1 1XL up to High SY1 1XN up to High SY1 1XQ up to High SY1 1XR up to High SY1 2BX up to High SY1 2DP up to High SY1 2ED up to High SY1 2JB up to High SY1 2JS up to High SY1 2PF up to High SY1 1HH up to Medium SY1 1NX up to Medium SY1 1PA up to Medium SY1 1PH up to Medium SY1 1PP up to Medium SY1 1PQ up to Medium SY1 1PT up to Medium SY1 1PU up to Medium SY1 1PW up to Medium SY1 1PX up to Medium SY1 1QB up to Medium SY1 1RU up to Medium SY1 1TX up to Medium SY1 1TY up to Medium SY1 1XB up to Medium SY1 1XJ up to Medium SY1 1XY up to Medium SY1 2DL up to Medium SY1 2DR up to Medium SY1 2DS up to Medium SY1 2DZ up to Medium SY1 2JW up to Medium SY1 2LT up to Medium SY1 1DQ up to Low SY1 1JR up to Low SY1 1NA up to Low SY1 1NB up to Low SY1 1PB up to Low SY1 1PD up to Low SY1 1PE up to Low SY1 1PJ up to Low SY1 1PL up to Low SY1 1PR up to Low SY1 1PS up to Low SY1 1QS up to Low SY1 1QU up to Low SY1 1RT up to Low SY1 1RY up to Low SY1 1SA up to Low SY1 1TG up to Low SY1 1TT up to Low SY1 1TZ up to Low SY1 1UX up to Low SY1 2BF up to Low SY1 2BT up to Low SY1 2DJ up to Low SY1 2DQ up to Low SY1 2EB up to Low SY1 2EE up to Low SY1 2EG up to Low SY1 2EH up to Low SY1 2EJ up to Low SY1 2EL up to Low SY1 2EN up to Low SY1 2HP up to Low SY1 2HS up to Low SY1 2JD up to Low SY1 2JJ up to Low SY1 2JL up to Low SY1 2JN up to Low SY1 2JP up to Low SY1 2JR up to Low SY1 2JT up to Low SY1 2JU up to Low SY1 2PE up to Low SY1 2PJ up to Low SY1 2PL up to Low SY1 2PN up to Low SY1 2PR up to Low SY1 2PT up to Low SY1 2PU up to Low SY1 2PZ up to Low SY1 2QA up to Low SY1 2QF up to Low SY1 2QG up to Low SY1 2QJ up to Low SY1 2QL up to Low SY1 2QN up to Low SY1 2QQ up to Low SY1 2QR up to Low SY1 2QS up to Low SY1 2QW up to Low SY1 2RG up to Low SY1 2RH up to Low SY1 2RL up to Low SY1 2RN up to Low SY1 2RP up to Low SY1 2SH up to Low SY1 2SL up to Low SY1 2SN up to Low SY1 2SP up to Low SY1 2SR up to Low SY1 2TN up to Low SY1 2TP up to Low SY1 2TR up to Low SY1 2TT up to Low SY1 2TU up to Low SY1 2TW up to Low SY1 2TX up to Low SY1 2TY up to Low SY1 2TZ up to Low SY1 2UA up to Low SY1 2UB up to Low SY1 2UE up to Low SY1 2UG up to Low SY1 2UH up to Low SY1 2UJ up to Low SY1 2UL up to Low SY1 2UN up to Low SY1 2UQ up to Low SY1 2UR up to Low SY1 2US up to Low SY1 2UT up to Low SY1 3RT up to Low SY1 3SJ up to Low SY1 3SN up to Low SY1 3SR up to Low SY1 3SS up to Low SY1 3ST up to Low SY1 3TG up to Low SY1 3TP up to Low SY1 3XS up to Low SY1 3XW up to Low SY1 3YS up to Low SY1 3YT up to Low SY1 3YX up to Low SY1 3YY up to Low SY1 3YZ up to Low SY1 4DA up to Low SY1 4NQ up to Low SY1 4NS up to Low SY1 4PP up to Low SY1 4YQ up to Low