▁cycl ists ▁Category : Pe ople ▁from ▁Ern ée ▁Category : T our ▁de ▁France ▁cycl ists ▁Category : S ports people ▁from ▁May enne <0x0A> </s> ▁Q ort em ▁Z er ’ a ▁is ▁a ▁river ▁of ▁the ▁N ile ▁bas in . ▁R ising ▁in ▁the ▁mountains ▁of ▁Dog u ’ a ▁T emb ien ▁in ▁northern ▁Eth iop ia , ▁it ▁flows ▁west ward ▁to ▁empty ▁finally ▁in ▁Wer i ’ i ▁and ▁Te ke z é ▁River . ▁ ▁Character istics ▁ ▁It ▁is ▁an ▁e ph em eral ▁river , ▁mostly ▁me and ering ▁in ▁its ▁all uv ial ▁plain , ▁with ▁an ▁average ▁slope ▁gradient ▁of ▁ 3 4 ▁metres ▁per ▁kilomet re . ▁ ▁Flash ▁flo ods ▁and ▁flo od ▁buffer ing ▁Run off ▁mostly ▁happens ▁in ▁the ▁form ▁of ▁high ▁run off ▁dis charge ▁events ▁that ▁occur ▁in ▁a ▁very ▁short ▁period ▁( called ▁flash ▁flo ods ). ▁These ▁are ▁related ▁to ▁the ▁ste ep ▁top ography , ▁often ▁little ▁veget ation ▁cover ▁and ▁inten se ▁con ve ct ive ▁ra inf all . ▁The ▁pe aks ▁of ▁such ▁flash ▁flo ods ▁have ▁often ▁a ▁ 5 0 ▁to ▁ 1 0 0 ▁times ▁larger ▁dis charge ▁than ▁the ▁preceding ▁base flow . ▁The ▁magnitude ▁of ▁flo ods ▁in ▁this ▁river ▁has ▁however ▁been ▁decre ased ▁due ▁to ▁inter vent ions ▁in ▁the ▁catch ment . ▁Phys ical ▁conservation ▁structures ▁such ▁as ▁stone ▁bund s ▁and ▁check ▁d ams ▁intercept ▁run off . ▁On ▁many