Effect of using guide walls and piers with different geometries on the flow at entrance of a spillway Matin Jahani, Hamed Sarkardeh and Ebrahim Jabbari Eur. Phys. J. Plus, 133 3 (2018) 91 Published online: 05 March 2018 DOI: 10.1140/epjp/i2018-11948-5