22-2-2016
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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
 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 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)
 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
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