The document shows monthly rainfall data from 1990 to 2011 for an unspecified location. It includes the average rainfall for each month and year over the 22 year period. It then uses the average rainfall data to calculate estimated water collection amounts on a building with a green roof and standard roof surfaces under drought, excess rain, and average rainfall conditions. The calculations provide total monthly and annual water collection estimates for the different roof scenarios.

1. Monthly Rainfall 9840
Month 1990 1991 1992 1993 1994 1995 1996 1997
Jan 1.17 5.08 5.64 1.31 1.55 0.28 0.00 0.44
Feb 2.68 2.34 6.37 3.72 0.64 1.19 0.69 2.44
Mar 5.17 1.06 6.12 1.56 5.06 1.58 0.30 2.24
April 4.52 4.91 3.03 1.81 2.21 1.07 0.89 5.72
May 3.28 5.30 8.15 12.47 7.01 5.36 1.26 3.91
June 1.18 2.28 5.67 6.43 1.66 4.81 2.12 7.30
July 8.29 2.23 1.28 0.00 0.50 0.71 1.31 0.00
Aug 1.30 2.84 2.56 0.01 2.54 2.03 2.86 0.62
Sept 3.70 1.42 1.12 0.52 5.52 4.49 3.66 1.86
Oct 3.71 0.87 0.92 3.07 9.75 0.23 0.36 4.08
Nov 3.11 0.47 3.47 0.66 0.71 0.82 2.79 1.76
Dec 0.20 13.96 2.16 0.44 3.28 0.64 1.56 3.55
Annual Total 38.31 42.76 46.49 32.00 40.43 23.21 17.80 33.92
2nd Floor
Drought Condition 1st Floor Roof
Roof
Average Gallons Gallons Total Amount
Gallons
Month Rainfall Collected On Relased from of Water Assumptions
Collected
(in) Green Roof Green Roof Collected (gal)
Jan 0.42 2,395.68 1,197.84 2,874.82 4,072.66 Assumption of 50% of collected green roof
Feb 0.20 1,140.80 570.40 1,368.96 1,939.36 water will be released from the green roof
Mar 1.82 10,381.28 5,190.64 12,457.54 17,648.18 lawn.
April 0.83 4,734.32 2,367.16 5,681.18 8,048.34 Assumption of 80% collection efficiency was
May 0.66 3,764.64 1,882.32 4,517.57 6,399.89 used in the calculation of the 2nd story roof
June 0.01 57.04 28.52 68.45 96.97 and non green roof portion
July 3.86 22,017.44 11,008.72 26,420.93 37,429.65
Aug 4.98 28,405.92 14,202.96 34,087.10 48,290.06
Sept 0.46 2,623.84 1,311.92 3,148.61 4,460.53
Oct 0.26 1,483.04 741.52 1,779.65 2,521.17
Nov 0.01 57.04 28.52 68.45 96.97
Dec 0.25 1,426.00 713.00 1,711.20 2,424.20
78,487.04 39,243.52 94,184.45 133,427.97

2. 2nd Floor
Excess Rain Condition 1st Floor Roof
Roof
Average Gallons Gallons Total Amount
Gallons
Month Rainfall Collected On Relased from of Water Assumptions
Collected
(in) Green Roof Green Roof Collected (gal)
Jan 4.33 24,698.32 12,349.16 29,637.98 41,987.14 Assumption of 50% of collected green roof
Feb 0.08 456.32 228.16 547.58 775.74 water will be released from the green roof
Mar 7.24 41,296.96 20,648.48 49,556.35 70,204.83 lawn.
April 4.61 26,295.44 13,147.72 31,554.53 44,702.25 Assumption of 80% collection efficiency was
May 3.35 19,108.40 9,554.20 22,930.08 32,484.28 used in the calculation of the 2nd story roof
June 6.47 36,904.88 18,452.44 44,285.86 62,738.30 and non green roof portion
July 11.76 67,079.04 33,539.52 80,494.85 114,034.37
Aug 6.77 38,616.08 19,308.04 46,339.30 65,647.34
Sept 1.09 6,217.36 3,108.68 7,460.83 10,569.51
Oct 0.75 4,278.00 2,139.00 5,133.60 7,272.60
Nov 0.40 2,281.60 1,140.80 2,737.92 3,878.72
Dec 0.40 2,281.60 1,140.80 2,737.92 3,878.72
269,514.00 134,757.00 323,416.80 458,173.80

3. 2nd Floor
Average Rain Condition 1st Floor Roof
Roof
Average Gallons Gallons Total Amount
Gallons
Month Rainfall Collected On Relased from of Water Assumptions
Collected
(in) Green Roof Green Roof Collected (gal)
Jan 1.88 10,707.96 5,353.98 12,849.56 18,203.54 Assumption of 50% of collected green roof
Feb 1.80 10,238.68 5,119.34 12,286.42 17,405.76 water will be released from the green roof
Mar 2.48 14,117.40 7,058.70 16,940.88 23,999.58 lawn.
April 2.28 12,999.93 6,499.97 15,599.92 22,099.89 Assumption of 80% collection efficiency was
May 3.54 20,166.23 10,083.12 24,199.48 34,282.60 used in the calculation of the 2nd story roof
June 3.44 19,619.17 9,809.58 23,543.00 33,352.58 and non green roof portion
July 3.05 17,389.42 8,694.71 20,867.31 29,562.02
Aug 2.25 12,859.93 6,429.96 15,431.91 21,861.88
Sept 3.38 19,305.45 9,652.72 23,166.54 32,819.26
Oct 4.09 23,342.32 11,671.16 28,010.79 39,681.95
Nov 2.16 12,331.01 6,165.51 14,797.21 20,962.72
Dec 1.95 11,148.73 5,574.36 13,378.47 18,952.84
184,226.24 92,113.12 221,071.48 313,184.60

4. 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
3.21 0.04 1.40 2.85 0.37 0.99 2.31 2.18 0.35 4.33 0.42 0.27
3.37 0.01 2.20 0.70 0.42 2.15 1.73 2.42 0.62 0.08 0.20 0.65
2.85 3.48 0.91 2.77 1.19 0.77 2.36 2.00 1.36 7.24 1.82 2.51
0.05 0.91 1.22 2.29 3.82 0.17 5.02 0.01 1.40 4.61 0.83 2.05
0.34 2.78 3.59 2.48 2.26 0.12 1.80 2.97 3.80 3.35 0.66 1.57
0.81 3.37 7.61 3.39 1.48 2.90 9.47 0.81 1.63 6.47 0.01 0.45
0.21 1.80 0.34 0.50 16.92 8.12 0.61 2.10 1.41 11.76 3.86 0.48
7.78 2.11 0.16 7.83 0.54 1.65 1.10 1.22 0.03 6.77 4.98 0.45
1.57 0.05 2.65 4.05 7.02 9.21 1.92 1.39 4.11 1.09 0.46 6.35
18.07 1.29 5.62 2.07 7.64 1.94 9.47 1.14 3.44 0.75 0.26 11.90
3.40 0.05 8.58 4.36 2.08 0.32 9.46 0.20 0.75 0.40 0.01 2.09
0.39 0.52 1.57 3.43 2.53 0.11 0.08 0.10 2.44 0.40 0.25 1.92
42.05 16.41 35.85 36.72 46.27 28.45 45.33 16.54 21.34 47.25 13.76 30.69

5. 2010 2011 Average
4.45 2.66 1.88
4.38 0.49 1.80
2.09 0.01 2.48
3.57 0.03 2.28
4.48 0.84 3.54
4.24 1.58 3.44
3.68 0.96 3.05
0.07 0.15 2.25
9.37 2.93 3.38
0.17 3.28 4.09
0.26 1.81 2.16
0.63 2.84 1.95
37.39 17.58 31.47