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01 POWER ISLAND / 04 CO2 capture / FEED Study for Retrofitting the Prairie State Generating Station with an 816 MWe Capture Plant using Mitsubishi Heavy Industries Post-Combustion CO2 Capture Technology.pdf
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published Bulletin 75 from the Illinois State Water Survey and is estimated using observations between

1948 and 2017.

Table 3. 25-year and 50-year storm precipitation totals for different durations

Storm Duration

25-year Total

50-year Total

(inches)

(inches)

 

240 hours

10.8

11.95

120 hours

8.79

9.81

72 hours

7.96

8.89

48 hours

7.25

8.15

24 hours

6.3

7.14

18 hours

5.92

6.71

12 hours

5.48

6.21

6 hours

4.73

5.36

3 hours

4.03

4.57

2 hours

3.65

4.14

1 hour

2.96

3.36

Site Specific Design Considerations

The site ambient design conditions that will be used for this project are as follows: Temperature

Basis for plant performance:

Design dry bulb: 93°F

Design coincident wet bulb: 78°F Basis for design of outdoor equipment

Design maximum dry bulb: 110°F

Design minimum dry bulb: 0°F Elevation and Pressure

Site elevation, ft above mean sea level (MSL): 454 ft.

Elevation of coal and ash storage, ft above MSL: 455 ft.

Barometric pressure (approximate) at 70°F, 29.549 in. Hg (14.513 psia)

Page 13 of 145

Rainfall/Snowfall

Rainfall for 24-hour shall be from Rainfall Frequency Atlas of the United States, Technical Paper No.40, US Department of Commerce, Washington, D.C., May 1961, and NOAA Technical Memorandum NWS HYDRO-35, Five-to 60-Minute Precipitation Frequency for the Eastern and Central United States.

Precipitation

Annual average: 43.14 in.

10 year, 1-hour max: 2.20 in.

10 year, 24-hour max: 4.77 in.

25 year, 1-hour max: 2.59 in.

25 year, 24-hour max: 6.3 in.

100 year, 1-hour max: 3.24 in.

100 year, 24-hour max: 7.44 in. Snowfall

Annual average: 17.7 in.

Maximum snowfall in 24-hr: 14.8 in. Storm Water

Design storm return period: 10 years

Design storm duration: 24 hours

Frost Penetration

Feet below grade: 30 inches

Page 14 of 145