Reservoir Delta Cross-Section Simulator

Every dam traps the river that feeds it, and every trapped river answers by filling its own reservoir back in. This 2D cross-section simulator models the classic Gilbert-type delta that forms where an inflowing, sediment-laden river meets the still water behind a dam: a flat topset at pool level, a steep foreset advancing toward the dam at the sediment's angle of repose, and a thin bottomset draping the deepest water — drawn as a true elevation-vs-distance stratigraphic section, with a live strip chart tracking storage capacity lost over simulated years. Choose a grain-size class, set the river's sediment load, and watch the delta prograde down the reservoir.