22-2-2016
Checked; aaa Some text
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BOX GUTTER AND RAIN WATER HEAD DESIGN TO AS/NZS 3500.3:2015
Industrial Building for James Crint & Co.
111 Blogs Lane Blogsville
diagramatoc of roof
Vert Face Area LHS = 11 sq.m Vert Face Area RHS = 0 sq.m
Roof Horiz Area LHS= 111 sqm
Roof Slope = 11 deg.
Roof Horiz Area RHS= 0 sqm
Roof Slope = 0 deg.
Box gutter width = 300 Overflow width = 350
Parapet Vert face Area LHS = 0 sq.m  Parapet Vert face Area RHS = 0 sq.m
Design Storm Intensity (ARI 100) I = mm/hr
Calculate Vertical areas.
 Roof Slope LHS = 11 deg Therefore Area Vertical rise = roof Area*tan(Slope)
= 111*tan(11)
= 22 sqm
 Total vert area LHS = roof rise + vert face = 22+11 = 33 sq.m
Calculate LHS catchment area for each wind direction
 Ac = Ah + 1/2(Av facing wind - Av causing rain shadow)
 wind from front Acf = (111+ 0.5*(33-0)
= 127.5 sq.m
 wind from back AcB = (111+ 0.5*(0-33)
= 94.5 sq.m
Calculate RHS catchment area for each wind direction
 Ac = Ah + 1/2(Av facing wind - Av causing rain shadow)
 wind from front Acf = (0+ 0.5*(0-0)
= 0 sq.m
 wind from back AcB = (0+ 0.5*(0-0)
= 0 sq.m
Find worst case and design Box gutter for that condition
 Largest catchment area = LHS with wind from front ca = 127.5 sq.m
 Design Flow = I*A/3600 therefore Q = 7.8 L/s
 from Fig I6(a) loc = 42 mm
 From Fig I6(b) Overflow (spitter) depth doc = 78 mm
 Box gutter depth from Fig I5 = loc + (doc + 30) BGd = 150 mm
Sump Design
 Downpipe Dia Dia = 100 mm
 from Fig I4 Sump Depth SD = 263 mm
 From Code sump length = overflow width + 2*loc SL = 350+ 2*42 mm
= 434 mm
Clearances
box gutter with middle sump and side o'flow
From Code clearance B, (Height of spitter above base of box gutter) = 0.7 * loc
= 29 mm
Dimension C (freeboard above spitter)=BG depth-B-O'flow depth = 44 mm
Diagrammatic (Not to scale)
diagramatoc of sump
150 78
29 350 42
300
263  
434
DP Dia 100
Summary
Box Gutter width = 300 mm
Box Gutter depth = 150 mm
Overflow (spitter) width = 350 mm
Overflow (spitter) depth = 78 mm
Sump depth = 263 mm
Sump width = 300 mm
Sump length = 434 mm
clearance loc = 42 mm
clearance B = 29 mm
clearance C = 44 mm
Joe Blogs
Head Honcho
Hydraulic Dept