Investigation of the Impact of Cell Excavation on the Performance of Piano Key Weirs Spillways – Type (A) – for Enhancing Flood Protection and Dam Safety

Investigation of the Impact of Cell Excavation on the Performance of Piano Key Weirs Spillways – Type (A) – for Enhancing Flood Protection and Dam Safety | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Systematic Review Investigation of the Impact of Cell Excavation on the Performance of Piano Key Weirs Spillways – Type (A) – for Enhancing Flood Protection and Dam Safety ABDERRAHMANE NOUI This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8132586/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Piano Key Weirs (PKWs), particularly non-rectilinear spillways, play a crucial role in flood control and dam discharge management, significantly improving both discharge capacity and storage potential for new and existing dams. These innovative structures were developed by Ouamane and Lempérière between 2003 and 2006, introducing a unique design compared to conventional labyrinth spillways. Characterized by their non-rectilinear geometry, PKWs feature rectangular cells and sloping riffles that optimize water flow. The PKW Type A spillway design includes three key cell configurations: (1) basic rectangular cells without modifications, (2) symmetrical widening of both upstream and downstream cells, and (3) asymmetrical widening of either the upstream or downstream cells. This study, conducted on the PKW Type A at the M’anab El Ghoulal Dam in Biskra, Algeria, experimentally investigates the impact of cell widening on the hydraulic performance of PKW Type A to enhance flood protection and dam safety. The results demonstrate that increasing cell width significantly boosts discharge capacity compared to configurations without parapet walls. The performance improvement is particularly influenced by the ratio of cell depth to the spillway's maximum height. Among the tested designs, the PKW Type A with symmetrical parapet walls exhibited the highest efficiency, followed by models with upstream-only parapet walls, and finally those with downstream-only walls. These findings provide valuable insights into optimizing PKW designs for improved flood resilience and dam protection. Hydrology Civil Engineering flood spillway Pkw parapet walls discharge capacity Full Text Additional Declarations The authors declare no competing interests. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-8132586","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Systematic Review","associatedPublications":[],"authors":[{"id":546111955,"identity":"a1003c7d-c29b-4f68-8f30-f8969cbc6807","order_by":0,"name":"ABDERRAHMANE 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Safety\u003c/strong\u003e\u003c/p\u003e","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":true,"hideJournal":true,"highlight":"","institution":"Center for Scientific and Technical Research on Arid Regions (CRSTRA) Algeria","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research 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These innovative structures were developed by Ouamane and Lemp\u0026eacute;ri\u0026egrave;re between 2003 and 2006, introducing a unique design compared to conventional labyrinth spillways. Characterized by their non-rectilinear geometry, PKWs feature rectangular cells and sloping riffles that optimize water flow.\u003c/p\u003e\u003cp\u003eThe PKW Type A spillway design includes three key cell configurations: (1) basic rectangular cells without modifications, (2) symmetrical widening of both upstream and downstream cells, and (3) asymmetrical widening of either the upstream or downstream cells.\u003c/p\u003e\u003cp\u003eThis study, conducted on the PKW Type A at the M\u0026rsquo;anab El Ghoulal Dam in Biskra, Algeria, experimentally investigates the impact of cell widening on the hydraulic performance of PKW Type A to enhance flood protection and dam safety. 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