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

III. Hydrologic Condition: Good ( Good: >75% ground cover)
is IV. Hydrologic Soil Group = C
V. CN =74
•
•
(Runoff Curve Number and Runoff (SurvCAD)
(Project: Pond 013 By: B Langenfeld Date: 08/18/09
Location: New Horizon #2 Checked: Date:
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): 74.0
'Total Area: 72.392 Acre
:2. Runoff
(Return Period:
(Rainfall, P:
(Runoff, Q:
(Runoff Volume
CN
Soil Type
Area(Acre)
74
C
5.242
74
C
6.160
74
C
42.023
74
C
18.967
10 -Year
2.00 in
0.3498 in
2.1104 Acre -Ft
'The pond volume below the emergency spillway will be comprised of three design needs:
1) 10 year storm inflow of 2.1 acre feet, as described above
:3) 3 year sediment delivery of 0.1 acre feet, as based on the calculations shown below.
'Therefore, the total design volume below the emergency spillway is 2.1+ 0.1 ac -ft which is 2.2
acre feet. As is shown on the stage storage relationship for the as built pond, the bottom of the
emergency spillway is 5559', which has a volume of 9.9 acre -ft at this elevation.
Revised May 2010 (PR06) Attachment 2.05.3(3) -6 -3