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Systems Analysis of Zaragoza UWS Guillermo Penagos
Annex 10. Calculations for Storm water overflows to the Ebro River
Year
Precipitation
* Inpervious
area
Expected
from
precipitation
+
consumption
Total
Inflow
WWTPs
Expected from
consumption
minus Total
inflow WWTPs
Overflows
to the
river
Precipitation
Month (mm)
2001 Jan 30 837,480 5,893,629 5,283,654 227,505 609,975
2001 Feb 4 105,840 4,561,242 4,750,549 295,147 0
2001 Mar 24 665,280 5,564,739 5,019,201 119,743 545,537
2001 Apr 7 198,800 4,854,963 5,959,424 1,303,262 0
2001 May 50 1,405,880 6,418,318 6,542,564 1,530,126 0
2001 Jun 8 213,080 5,869,981 6,599,078 942,178 0
2001 Jul 46 1,300,320 6,882,947 6,760,941 1,178,315 122,005
2001 Aug 4 113,400 5,522,964 6,382,140 972,577 0
2001 Sep 73 2,047,640 7,377,521 5,888,392 558,510 1,489,130
2001 Oct 17 482,440 5,743,443 6,244,635 983,632 0
2001 Nov 12 326,480 5,431,775 5,568,865 463,570 0
2001 Dec 0 0 5,411,588 5,450,557 38,968 0
2002 Jan 31 879,480 6,074,230 5,567,126 372,376 507,104
2002 Feb 6 177,240 4,488,013 5,203,145 892,372 0
2002 Mar 37 1,029,840 5,830,599 5,804,472 1,003,713 26,127
2002 Apr 26 731,360 5,095,437 5,721,607 1,357,530 0
2002 May 1 33,600 4,700,258 6,183,598 1,516,940 0
2002 Jun 14 397,600 5,434,335 5,770,842 734,107 0
2002 Jul 16 448,000 5,704,241 5,848,143 591,902 0
2002 Aug 9 252,000 4,989,296 5,481,357 744,061 0
2002 Sep 23 644,000 5,476,632 5,963,792 1,131,160 0
2002 Oct 38 1,052,800 5,908,543 6,087,789 1,232,046 0
2002 Nov 10 268,800 5,072,870 6,082,345 1,278,275 0
2002 Dec 21 599,200 5,368,205 5,235,784 466,778 132,422
Formula
Estimated storm water
= Precipitation * impervious area
Overflows = Estimated storm water +
Expected WWTPs inflow – Actual inflow to
WWTPs
Impervious area (km 2 ) = 28,000
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