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Gutter Design Calculations

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  I. Design Data Maximum Intensity of rain fall per hour=200 mm/hourSpacing of Downtake pipe=11.2 m Tributary Width of the roof=34 m Slope of roof=2.86°Eaves height13.75 m II. Design Calculation Total Rain-fed area of one bay=380.8Volume of rain water collected in one bay during=76.16max. intensity of rainfall of 200 mm/hourVolume of water collected=0.037m3/m/6per meter per 60sec. i) Size of Gutter Length of one bay=11.20 mWidth of one bay=34.00 mAssume the width of Gutter=0.45 mVolume of water collected in Catchment area of 11.2 x 1 meter for 1 m length=0.037Reqd Depth of Gutter=0.08 mProvide depth of gutter including free board=0.45 m 116.2 m 450450 64 m 0.45 11.2 m Diameter of down take pipe =150mmProvide150mm dia. @ 11.2 m c/c down takeA = Area of pipe=0.018Velocity of flow at the bottom of the pipe=Eaves Heighth=13.75 mVelocity of flow at the pipe outlet V==16.425m/sec.Discharge through a single pipeQ=A.VQ = Area of Pipe x Velocity of Flow=0.290m3/sec.Discharge through a single pipe per 60Sec.=17.42m3/minConsider factor of safety as 1.5=1.5Discharge through a single pipe of 150 mm dia / 1m=11.61m3/minSAFEm 2 m 3  /hr III Discharge Calculaiton m 2 Ö 2gh  Consider one bay of area = 11.2 meter x 34 meter=380.8m2=76.16m3/hr.1.2693333333m3/min=11.61m3/min IV) Calculation Rain Fall Collection verses Discharge through Downtake Collection of rain water during max. intensity of rain fall of 200 mm / hourCollection of rain water during max. intensity of rain fall of 200 mm / minuteDicharge through 150 mm dia. Pipe After considering factor of safety as 1.5 V) Inference:  During 200mm/hr intensity of rain fall for the catchment of 11.2m x 34m bay provide Gutter size of 450mm x 0.45 mm x450 mm and provide 150dia. Pipe at each bay of 34 m C/C  0sec..pipe  .pipe  ipe
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