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> />
5.23 DNIT, 2006<<strong>br</strong> />
Conforme DNIT, 2006 temos a fórmula de Manning modificado por Izzard conforme Figura<<strong>br</strong> />
(5.15) e Tabela (5.22).<<strong>br</strong> />
Q= 0,376 x (Z / n) x y 8/3 x S 0,5<<strong>br</strong> />
Sendo:<<strong>br</strong> />
Q= vazão na sarjeta (m 3 /s)<<strong>br</strong> />
Y= altura da água na sarjeta (m)<<strong>br</strong> />
S= declividade longitudinal da sarjeta (m/m)<<strong>br</strong> />
n= coeficiente de rugosidade de Manning<<strong>br</strong> />
Z= recíproca da declividade transversal Z= tg (θ )<<strong>br</strong> />
tg (θ )= T / y<<strong>br</strong> />
T= y x Z<<strong>br</strong> />
y/T= 1 / tg (θ)<<strong>br</strong> />
Caso Z=12<<strong>br</strong> />
y/T=Sx= 1/12=0,083m/m<<strong>br</strong> />
Figura 5.23- Corte transversal de uma sarjeta mostrando o ângulo θ<<strong>br</strong> />
Tabela 5.19- Vazão na sarjeta sendo a altura da água y=0,10m, declividade transversal 2% e<<strong>br</strong> />
coeficiente de Manning n=0,013, Z=50.<<strong>br</strong> />
S<<strong>br</strong> />
(m/m)<<strong>br</strong> />
Q<<strong>br</strong> />
(m 3 /s)<<strong>br</strong> />
0,005 0,22<<strong>br</strong> />
0,010 0,31<<strong>br</strong> />
0,015 0,38<<strong>br</strong> />
0,020 0,44<<strong>br</strong> />
0,025 0,49<<strong>br</strong> />
0,030 0,54<<strong>br</strong> />
0,035 0,58<<strong>br</strong> />
0,040 0,62<<strong>br</strong> />
0,045 0,66<<strong>br</strong> />
0,050 0,69<<strong>br</strong> />
0,055 0,73<<strong>br</strong> />
0,060 0,76<<strong>br</strong> />
0,065 0,79<<strong>br</strong> />
0,070 0,82<<strong>br</strong> />
0,075 0,85<<strong>br</strong> />
0,080 0,88<<strong>br</strong> />
0,085 0,91<<strong>br</strong> />
0,090 0,93<<strong>br</strong> />
0,095 0,96<<strong>br</strong> />
0,100 0,98<<strong>br</strong> />
0,105 1,01<<strong>br</strong> />
0,110 1,03<<strong>br</strong> />
5-43