天沟排水量计算公式

天溝排水量計算

Tonnage of cullis calculation

1降雨量I=100mm/hr

Rainfall

2雨棚長L=60m

The length of canopy

3雨棚寬B=12m

The width of canopy

4天溝雨水量Qr=I*L*B=0.020m^3/sec The rainwaterl of culis

5天沟泄水坡度S=0.1

he slope of culis

5天溝上方寬度H=350mm

The width of cullis at top

6天溝下方寬度T=350mm

The width of cullis at bottom

7天溝總深度W=150mm

The depth of cullis

8天溝安全深度Dw=120mm

The safty depth of cullis

9天沟截面面积A=H*T*Dw=0.042m^2 The area of cullis

10天沟周长P=T+2*Dw=0.590m The girth of cullis

11天沟粗造度係數(SUS)n=0.01

The rough efficient of panel

12水力半徑Rh=A/P=0.071m The radius water powerful

13天溝之單位排水量Qp=1/n*A*(Rh)^2/3*S^1/2=0.128m^3/sec The tonnage of culis(曼寧公式 Manning Formula)

14结论Qp>Qr is ok!

So

落水管計算

The calculation for rainspout

1落水管支數m=1支

The number of rainspout

2落水管外徑d=200mm

The outer diameter of rainspout

3落水管斷面積Ad=18.2m^2

The area of rainspout section

4重力加速度g=9.8m/sec^2

The acceleration of gravity

5落水管排水量Qd=m*Ad*(2*g*Dw)^1/2=#####m^3/sec The tonnage of rainspout

6结论Qd>Qr is ok!

So