Does DH1 flood?

DH1 1JY up to High DH1 1QL up to High DH1 1SL up to High DH1 1SQ up to High DH1 1TB up to High DH1 2LY up to High DH1 2SE up to High DH1 2SU up to High DH1 3AA up to High DH1 3AF up to High DH1 3AG up to High DH1 3AH up to High DH1 3AQ up to High DH1 3BL up to High DH1 3BN up to High DH1 3BW up to High DH1 3DA up to High DH1 3ET up to High DH1 3JU up to High DH1 3PJ up to High DH1 3RA up to High DH1 3RP up to High DH1 3SB up to High DH1 3SE up to High DH1 3SG up to High DH1 3SJ up to High DH1 3SL up to High DH1 3SN up to High DH1 3SP up to High DH1 3SQ up to High DH1 4FS up to High DH1 4FT up to High DH1 4FX up to High DH1 4FY up to High DH1 4PW up to High DH1 4SL up to High DH1 4SW up to High DH1 4TH up to High DH1 5TA up to High DH1 1BW up to Medium DH1 1LB up to Medium DH1 1LE up to Medium DH1 1LH up to Medium DH1 1SG up to Medium DH1 1SZ up to Medium DH1 2NB up to Medium DH1 2ST up to Medium DH1 3HN up to Medium DH1 3JN up to Medium DH1 3NP up to Medium DH1 3SR up to Medium DH1 5TE up to Medium DH1 1JX up to Low DH1 1SW up to Low DH1 2NA up to Low DH1 2NE up to Low DH1 2NF up to Low DH1 2NG up to Low DH1 3DG up to Low DH1 3EB up to Low DH1 3EE up to Low DH1 3EN up to Low DH1 3EQ up to Low DH1 3ER up to Low DH1 3EW up to Low DH1 3HJ up to Low DH1 3HL up to Low DH1 3JJ up to Low DH1 3JT up to Low DH1 3LA up to Low DH1 3RJ up to Low DH1 3RN up to Low DH1 3RU up to Low DH1 3RX up to Low DH1 3RY up to Low DH1 3SA up to Low DH1 3SF up to Low DH1 3SS up to Low DH1 4TF up to Low DH1 5SY up to Low DH1 5SZ up to Low DH1 5TL up to Low DH1 1LA up to Very low DH1 1NU up to Very low DH1 4DB up to Very low