Abstract: A multiple flume water slide includes individual starting pools for each flume and a common landing pool mounted at different elevations on an earth foundation and connected by way of modular sectional flumes. Each flume consists of a minimal number of end reversible, end abutting, end-to-end sealed acrylic module flume sections which are generally concave upwardly away from the earth formation and are of generally semi-circular transverse cross-section, with each terminating along respective edges in integral upwardly convex hand rails. Straight sections have hand rails of the same height. Curved sections have lower radially inner and higher radially outer walls with the outer walls terminating in hand rails higher than those of the inner walls.