Tributary
Tributaryn bishaan ya'u yokan laga yoo ta'u, kunis gara laga birra (parent river yokan laga dura) yokan Qamma Bishaani (body of water)iit ya'u yoo ta'u, kan garu gara gallana cisetti hin senne dha. orography kessatti tributaryiin kan gargari itti bafaman, kan gara Burqaa lagat dhihoo ta'ani jalqabe kan hanga Afaan bishaanit dhihoo ta'anit gargari bafamani qoqodamu. confluenciin bakka "tributary"iin lama yokan lagni lama waliin ademani dha. 
Maqaan tributary mirgaa fi tributary bita jedhamu kan fayyadatamu, bakka tributaryiin sun laga irra essa gullatti akka argamu ilallun imamu dha. Kunis kara currentiin laga itti ademmu irratti hunda'etti. Fakkena yoo bishaani Nile gara kabba ademutti jirratte, currentiin bishaan gara kabba jechu dha, kanaf "tributary"iin baha irra dhufaan tributary mirgaa yoo ta'an, kan dhihaa irra dhufaan immo tributary bita jechu dha. Karan "current"iin itti ademu river bank wajjin gossa tokko dha. 
Fallan tributary immo distributary jedhama, kuni immo laga damee, bishaan guddicha irra gargari ba'u dha. 
Network analysis kan jedhamu wa'ee tesso tributary qo'atte, tartibba 1ffa, 2ffa fi 3ffa... ttin olka'a.