2011-11-30_PERMIT FILE - C1981008A ‎(5)‎

• Permit No: C1981008A
• IBM Index Class Name: Permit File
• Doc Date: 11/30/2011
• Doc Name: Pond 015-As Built ‎(TR60)‎
• Section_Exhibit Name: Section 2.05.3‎(3)‎ Attachment 2.05.3‎(3)‎-24
• Media Type: D
• Archive: Yes

Runoff Curve Number and Runoff (SurvCad)
Project: 015 POND RUNOFF
1. Runoff Curve Number (CN)
Cover description
CN
Soil Group
Area(Acre)
Regraded Mined Land, Reclaimed (Fair)
79
C
2.896
Mined Land, Disturbed (Poor)
87
C
0.465
Brush (Fair)
70
C
0.364
Brush (Fair)
70
C
2.438
CN (weighted): 75.5
Total Area: 6.163 Acre
2. Runoff
Return Period: 100 -Year
Rainfall, P: 3.00 in
Runoff, Q: 0.9883 in
Runoff Volume: 0.5076 Acre -Ft
Time of Concentration (SCS Method) (SurvCad)
Project: Pond 015 Drainage Area
Curve Number: 76
Length of Flow: 1287.68 ft
Average Land Slope: 11.12 %
Time of Concentration: 0.219 hrs, 13.2 mins
(June 2011 TR -60) Attachment 2.05.3(3) -24 -5