14 HYDRAULIC CALCULATIONS * mm/h = millimetres/hour BR LR A A = LR x BR A is the actual roof area in square metres LR is the length of the roof area to be drained BR is the width of the roof area from the gutter channel to roof ridge This chapter offers guidelines for assessing gutter system suitability to the roof areas that will be served on the basis of the wide range of products available. Using the following tables, you can evaluate on the spot which product best suits the specific micro-climatic conditions where it is to be installed. Reference values were obtained as required by the EN 12056-3:2001 standard on gravity drainage systems for rainwater evacuation. This European standard provides the method for calculating hydraulic adequacy of nonsiphonic rainwater drainage systems and sets the performance levels required. ACTUAL ROOF AREA: If not specifically provided otherwise by local and national regulations, no wind tolerance should be applied when calculating the actual roof area to be served by gutter channels and downpipes. In this case, regulations consider that rain falls square to the roof and, consequently, roof area will be calculated using the following formula: GUTTER CHANNEL FLOW-RATE ITEM GRN116 GR100 GRN125 GR145 GRN133 GRQ GRB120 GRG86 GRG2 2060 3770 5560 7000 11900 9188 9320 10030 12820 0,33 0,73 1,19 1,57 3,11 2,81 2,60 2,51 4,27 Section area mm2 l/s Table A: Select gutter channel profile depending on the roof area to be served (downpipe and channel should be compatible). Once you know the roof area, select the type according to rainfall intensity Table B: Select downpipe diameter based onmax height of rainfall to be drained and roof area involved rainfall intensity(mm/h*) 50 63 80 100 110 125 92x57 80x80 100x100 Tab. B 60 113 155 320 495 545 985 273 460 862 90 68 103 213 330 363 657 164 276 552 120 56 77 160 238 262 492 137 230 460 150 42 62 128 198 218 394 110 172 345 180 34 52 106 165 182 328 82 138 276 210 28 44 91 141 156 281 68 119 238 240 25 39 80 123 136 246 61 103 206 270 22 34 71 110 121 219 54 92 184 300 20 31 64 99 109 197 49 83 166 LOCATE DOWNPIPE TYPE BASED ON ROOF AREA downpipe per roof area DIAMETER mm. rainfall intensity(mm/h*) ITEM GRN116 GR100 GRN125 GR145 GRN133 GRQ GRB120 GRG86 GRG2 Tab. A 60 19 43 70 92 183 165 158 147 238 90 13 29 47 62 124 112 108 100 162 120 10 22 36 47 94 85 81 76 122 PROFILES AND COLOURS BROWN GREY SAND WHITE STEEL COPPER PLATED ANTIQUE COPPER 150 7 17 28 37 74 66 64 59 96 180 6 14 23 31 62 56 54 50 81 210 5 12 20 27 53 48 46 43 69 240 5 12 19 26 51 46 45 41 67 270 4 9 15 20 41 37 36 33 54 300 4 8 14 18 37 33 32 30 48 LOCATE GUTTER TYPE BASED ON ROOF AREA rain gutter per roof area
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