Box Guter No. 111 Job no 007 Design: BTW 1st Jan 2000 BOX GUTTER AND RAIN WATER HEAD DESIGN TO AS/NZS 3500.3:2015 Industrial Building for Mr Blogs Somewhere Lane, Somewhere Else. Diagramaic shape of Given Data (Not to scale) Ah Av Ac LHS RHS = = = = = Area Horiz Area Vert'l Area Cment Left hand Right hand sq.m. sq.m. sq.m. side side Design Storm Intensity (ARI 100) I = 330 mm/hr Catchment Areas as shown in the diagram. Calculate roof rise areas. Roof Slope LHS = 2 deg  Therefore Av1 = Ah1*tan(Slope) sqm Av1 = 111*tan(2) = 3.9 sqm Roof Slope RHS = 5 deg  Therefore Av3 = Ah2*tan(Slope) sqm Av3 = 22*tan(5) = 1.9 sqm Calculate catchment area for each wind direction Ac = Ah + 1/2(Av facing wind - Av causing rain shadow) wind from LHS Ac(LHS) = 111+22+0.5*(1.9+22-3.9-11) = 137.5 sq.m wind from RHS Ac(RHS) = 111+22+0.5*(3.9+11-1.9-22) = 128.5 sq.m wind from front Ac(front) = 111+22+0.5*(20-0) = 143 sq.m Worst wind direction is from the front Ac = 143 sqm. Design Flow Q = I*Ac/3600 Litres/sec = 330*143/3600 Litres/sec = 13.1 Litres/sec

### Box Gutter Depth

From Fig I1 (Interpolating where necessary)
Using :- Gutter Slope 1 in
and Gutter Width W = mm
from fig I1 Minimum Gutter Depth d = mm

Selected down pipe size = mm
From fig I3, Rain water head Depth (Interpolating where necessary) = mm
Rain water Head Depth increased to comply with Note 1 Fig I2
(RWH depth to be >= 1.25*DP dia.)

=

mm
= 188 mm
From fig I3, Rain water head Length at slope 1:200 = mm
Rain water Head Length increased to fit the DP 150 +20 = 170 mm
Rain water Head Width = mm

### Summary

Down Pipe Size = mm
Box Gutter Width = mm
Box gutter minimum Depth = mm
Rain Water Head Depth = mm
Rain Water Head Length = 170 mm
Rain Water Head Width = mm
James Crint