... iChauTownSuddenly‐ In Lay Nua Commune: 55deaths,morethan400householdswereevacuated,suspensionbridge and manyirrigationworksweresweptaway,hundreds of thousandscubicmeters of mud and debris buried the fieldsDaoDinhBac,TranThanhHa/VNUJournal of Science,EarthSciences23(2007)203‐212207Fig.3.Location of the debris and mud flash flood in the area of Lay Nua Commune. 4. Pattern and determinant agents of the debris and mud flash flood in the Lay Nua Commune area4.1. The determinant agents Thereweresomeattemptstofindrelat ... in the Lay Nua Commune, the Former Muong Lay District, Dien Bien Province. During 1990s,every two years it has to mention the name of the town of Former Muong Lay ... Lay District, Dien Bien Province evolves in accordance with the pattern of breach flash flood in the small and steepslopestream;‐ The determinant agents that cause the debris and mud ...