Md. Code, Environment § 4–202

By July 1, 1984, each county and municipality shall adopt ordinances necessary to implement a stormwater management program. These stormwater management programs shall be consistent with flood management plans, if any, developed under Title 5, Subtitle 8 of this article for a particular watershed, shall meet the requirements established by the Department under § 4-203 of this subtitle, and shall be consistent with the purposes of this subtitle.