The Biden administration on Wednesday approved a major disaster declaration unlocking federal funding for repairs in Brooklyn stemming from the drenching, record-setting rainstorm that doused the city in late September, officials said. Under the disaster declaration, federal cash is available for the restoration or replacement of certain facilities affected by the rainstorm and resulting flooding, according to the White House. Brooklyn is eligible to receive up to $12.5 million from the Federal Emergency Management Agency, according to Gov. Kathy Hochul’s office. The federal disaster declarati…