Discharge coefficient for free and submerged flow over Piano Key weirs

摘要

The Authors made an interesting contribution to the assessment of the discharge coefficient of Piano Key weirs (PKW). The Discussers were impressed to read that the Authors conducted some 600 tests thereby producing nearly 3000 data points. Such systematic test series are helpful for a general description of the PKW discharge capacity. Similar investigations are presently conducted at several institutions. The Discussers validated the Authors' Eq. (6) with their own physical model data. Furthermore, the application limits of the tests performed by the Authors are discussed with regard to the characteristics of existing prototype PKWs.