EFDC solver or scheme

Dear EFDC users,Good day.As far as I know, EFDC utilizes finite difference method, and I want to know which solver or scheme does EFDC use? Sincerely,Minjeong

You can find a detailed description of this here:https://eemodelingsystem.atlassian.net/wiki/spaces/ETG/pages/2385854/2.3+Numerical+Solution+for+the+Equations+of+Motion