CapÃtulo 5 Microdrenagem - Pliniotomaz.com.br
CapÃtulo 5 Microdrenagem - Pliniotomaz.com.br
CapÃtulo 5 Microdrenagem - Pliniotomaz.com.br
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Curso de Manejo de águas pluviais<<strong>br</strong> />
Capítulo 5-<strong>Microdrenagem</strong><<strong>br</strong> />
Engenheiro Plínio Tomaz 3 de agosto de 2012 pliniotomaz@uol.<strong>com</strong>.<strong>br</strong><<strong>br</strong> />
Tabela 5.32- Cálculo para o ângulo central por tentativas<<strong>br</strong> />
c c= sen c +4,29 [sen(c/2)] 0,33<<strong>br</strong> />
<<strong>br</strong> />
4 3,40<<strong>br</strong> />
3,40 4,02<<strong>br</strong> />
4,02 3,38<<strong>br</strong> />
3,38 4,04<<strong>br</strong> />
4,04 3,36<<strong>br</strong> />
3,36 4,07<<strong>br</strong> />
4,07 3,34<<strong>br</strong> />
3,34 4,09<<strong>br</strong> />
4,09 3,32<<strong>br</strong> />
3,32 4,11<<strong>br</strong> />
4,11 3,30<<strong>br</strong> />
3,30 4,13<<strong>br</strong> />
4,13 3,28<<strong>br</strong> />
Tomamos o valor médio c= (4,13+3,28)/2= 3,67 rad<<strong>br</strong> />
yc/D= (1/2) x (1 – cos c/2)<<strong>br</strong> />
yc/0,15=(1/2)x (1 – cos 3,67/2)=0,63 < 0,75D<<strong>br</strong> />
yc=0,095m<<strong>br</strong> />
Verificação<<strong>br</strong> />
Conforme Metcalf&Eddy, 1981 o valor de yc pode ser estimado por:<<strong>br</strong> />
yc= 0,483 x (Q/D) 2/3 + 0,083D<<strong>br</strong> />
yc= 0,483 x (0,01/0,15) 2/3 + 0,083x0,15=0,0933m<<strong>br</strong> />
y/D= 0,63<<strong>br</strong> />
R= (D/4) ( 1 – sen θ/ θ )<<strong>br</strong> />
R= (0,15/4) [ 1 – (sen 3,67)/ 3,67 ] =0,043m<<strong>br</strong> />
Vc= {[g xD/ (8 sen(c /2))] x (c - sen (c)} 0,5<<strong>br</strong> />
Vc= {[9,81 x0,15/ (8 sen(3,67 /2))] x (3,67 - sen (3,67))} 0,5<<strong>br</strong> />
Vc= {[0,19 x (3,67 +0,50} 0,5<<strong>br</strong> />
Vc=0,89m/s<<strong>br</strong> />
Declividade crítica<<strong>br</strong> />
Ic= =[n 2 x g/ (sen(c/2))] x [c 4 / (2,0 D (c – sen c))] (1/3)<<strong>br</strong> />
Ic= =[0,010 2 x 9,81/ (sen(3,67/2] x [3,67 4 / (2,0x0,15(3,67-sen 3,67] (1/3)<<strong>br</strong> />
Ic= =[0,00101 x 5,17] 1/3<<strong>br</strong> />
Ic=0,0052m/m<<strong>br</strong> />
5-93
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