Del. Code tit. 23 § 1505
The bulkhead line or lines of solid filling and the pier line in the tidewaters of the River Delaware, lying between the Christina River and the northerly boundary of Edge Moor, opposite the City of Wilmington and Edge Moor, as fixed, established and adopted, or hereafter to be fixed, established and adopted, by the Secretary of the Army of the United States, under the acts of Congress in that behalf, are adopted and declared to be fixed and established as the exterior bulkhead and pier lines between the points, as such exterior bulkhead and pier lines so fixed, established and adopted are or may hereafter be shown upon the manuscript map or maps, report or reports filed in the office of the Secretary of the Army or the Department of the Army.
23 Del. C. § 1505