Stormwater will be managed in accordance with § 256-54 of Chapter 256, Subdivision of Land, and with Chapter 246, Stormwater Management, in all aspects except for the design storm to which stormwater management facilities shall be designed. When approved by the Borough and Borough Engineer, the two-year design storm shall substitute for other design storms referenced, provided that the design of temporary and permanent facilities and structures meet with the approval of the Borough Engineer and/or Borough Council.