Rainfall data for the design of sewer detention basins

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45 After calculation of the basin volumes with the CTH-Model for the historical storms, the 36 largest basin volumes for each catchment and each outflow were ranked in descending order and plotted on exponential distribution papers with a logarithmic scale. The following formula was used for the estimation of the plotting positions i y. = l: 1 . J i 1,2, .. ,N . . . ( I 1) where yi = plotting positions for the calculated basin volumes in increasing order. N number of treated basin volumes which are chosen as equal to the number of treated time periods, in this case 36 !-year periods. yi is related to the return period through the relationship Y; = ln F .... (I.2) where F return period in number of treated time periods, in this case t-year periods (in the figures, F is given in years). In order to make the plottings more clear, the 7 largest basin volumes were plotted as individual points and the remaining basin volumes were plotted as average values of 3 volumes and 3 y-values. The basin volumes for the different design storms were plotted in the diagrams for the return periods t~ 1, 2, and 5 years.
GSJON x1mum basin 2.0 m flow 5 l s ·no red volumes r Each point (x) corresponds Each point ( x) corresponds value I to one historical storm - of historical storms X X ,, X X .X I I I I LEGEND ...... s1n mes X - m ® = /!:,. = ~ = -E-- =
Page 1 and 2: CHALMERS TEKNISKA HOGSKOLA GEOHYDRO
Page 4 and 5: PREFACE This report includes the re
Page 6 and 7: i i i SUMMARY This report describes
Page 8 and 9: 1 1 INTRODUCTION Detention basins i
Page 10 and 11: 3 form of a constant rainfall inten
Page 12 and 13: 2 REALIZATION OF IGN OF I BASINS 5
Page 14 and 15: 7 The method used for screening of
Page 16 and 17: 9 is just the constant rainfall int
Page 18 and 19: where t = time T = total duration c
Page 20 and 21: 13 in which the definition of the s
Page 22 and 23: 15 Infiltration f ---, I ~ ....J Di
Page 24 and 25: 17 the pipe Figure 2.8 The outlet f
Page 26 and 27: 2 5 As catchments for tests of the
Page 28 and 29: 21 One detention basin is located a
Page 30 and 31: 23 Table 2.6 Detention basin data.
Page 32 and 33: 25 ign Using ign Storms The differe
Page 34 and 35: where 27 M = volume of the basin (m
Page 36 and 37: 29 Table 2.9 Values of constants fo
Page 38 and 39: 31 000 GJ E :J 0 > 2 000 ~ w
Page 40 and 41: 3.2 The complete results of design
Page 42 and 43: 35 mary of the result as mean value
Page 44 and 45: 37 Table 3 4 Deviations in percent
Page 46 and 47: The overestimations for Sifal storm
Page 48 and 49: 41 LEGEND 30 XX Results reported by
Page 50 and 51: 43 * * * The Chicago design storm o
Page 54 and 55: BERGSJO xtmum basin depth 2.0 m f[o
Page 56 and 57: ERGSJO axtmum stn 2.0 m flow 30 l/s
Page 58 and 59: LIN 1mum mum G s1n 2.0 m flow 10 l
Page 60 and 61: s LINKOP G 1mum s1n 2.0 m outflow 3
Page 62 and 63: LINKOP G 2 x1mum basin depth 2. 0 m
Page 64 and 65: LIN G 2 X m s1n 2.0 m s1n volumes m
Page 66 and 67: mes RG x1mum mum Each point (x) cor
Page 68 and 69: volumes m 1mum s1n 3.5 m 2 flow 30
Page 70 and 71: es LINK x1mum 1 sn 3.5 m flow 10l/s
Page 72 and 73: LINK G 1mum s1n 3.5 m vo mes mum po
Page 74 and 75: LINK G 2 ax1mum s1n 3. 5 m outflow
Page 76 and 77: 2 vo Ll K 1mum (x) corresponds to t
Page 78 and 79: 71 Marsalek J., 1978: rch on the De
Page 80 and 81: 73 nr 22 nr 23 nr 24 nr 25 nr 26 nr

Rainfall data for the design of sewer detention basins

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