2010-12-08_PERMIT FILE - C1981008 ‎(10)‎

• Permit No: C1981008
• IBM Index Class Name: Permit File
• Doc Date: 12/8/2010
• Doc Name: Pond 013 Engineering and Hydrologic Design
• Section_Exhibit Name: Section 2.05.3‎(3)‎ Attachment 2.05.3‎(3)‎-6
• Media Type: D
• Archive: No

• Post Mine Drainage Calculations
103.1 acre drainage area (See Map 2.05.3(3) -1 -2)
• No pit pumping
• Curve Number (CN) to use: From SEDCAD 4 for Windows Help menu:
I. Curve Numbers for Other Agricultural Land Category
Il. Cover type: Pasture, grassland, or range -- continuous forage for grazing
III. Hydrologic Condition: Good ( Good: >75% ground cover)
IV. Hydrologic Soil Group = D
V. CN =80
Runoff Curve Number and Runoff (SurvCAD)
Project: Pond 013
Location: New Horizon #2
Present
1. Runoff Curve Number (CN)
• Cover description
Pasture Grassland Range (Good)
Pasture Grassland Range (Good)
Pasture Grassland Range (Good)
(Pasture Grassland Range (Good)
CN (weighted): 80.0
Total Area: 103.114 Acre
2. Runoff
By: B Langenfeld Date: 08/18/09
Checked: Date:
CN Soil Type Area(Acre)
80
D
0.926
80
D
82.914
80
D
11.808
80
D
7.466
Return Period:
10 -Year
Rainfall, P:
2.00 in
Runoff, Q:
0.5625 in
Runoff Volume:
4.8335 Acre -Ft
ICJ
Revised May 2010 (PR06) Attachment 2.05.3(3) -6 -6