PERMFILE110186

• Permit No: C1980007A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: Exhibit 66 Small Area Exemption Water Tank
• Media Type: D
• Archive: Yes

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West Elk
Small Area Exemption (SAE)
Water Tank
1. INTRODUCTION
1.1 Methods of Analysis
Doc Date:12111/2001
This review and analysis is made using the Sediment, Erosion, Discharge by Computer Aided Design
(SEDCAD+ Version 3) developed by Ivls. Pamela J. Schwab of Civil Software Design and Dr. Richard C.
Warner, Agricul[ural Engineering Department, University of Kentucky. It is based on field information
provided by Ka[hy Welt and as referenced herein.
7.2 Project Description
The project is a wa[er tank on a level pad. lnforma[ion provided includes:
1) That [he tank is located as shown on [he location map (Attachment 1).
2) That the tank is located on a level piece of ground in an area generally of 13% slopes. Only 1' of cut
is required to prepare the pad. There is no till slope.
3) The pad and associa[ed perimeter roads are gravel surfaced (the pad was assumed [o extend 12 feet
beyond the [ank a[ an outslope of O.S% in all directions).
4) The soil is (information Crom a soils boring) a silty sandy clay, moderate [o highly expansive.
S) The upslope is oak brush, fair cover. The tank site is grass, fair cover.
Runoff from above the tank pad would be intercepted by a ditch and diverted around the site (~h to each
side)(see Attachment 2, SEDCAD+ File C:\SEDCAD3\WELKISAEIDUP). Half the runoff from the tank
and pad would be directed away from the tank with distribu[ed discharge downslope from the pad (see
Attachment 4, SEDCAD+ File C:\SEDCADIWELK\SAETPDS). The other half of [he runoff from the tank
and pad would be directed into the slope, joining the runoff from the cut slope, and released at point
discharges on both sides oC the pad (Yz to each side)(see Attachment 3, SEDCAD+ File
C:\SEDCAD\WELK\SAECSTP). Thus this analysis considers a number of wa[ersheds:
1) the watershed above the in[erceptor ditch.
2) the cut slope above the pad.
3) that half of the exposed part of the pad that drains into the slope.
4) that half of the tank cover that drains into the slope.
5) that half of the tank cover that drains downslope.
6) that half of the exposed part of the pad that drains downslope.
The perimeter drainage sys[em crosses the access road [o the site. As (lows are so low, and ditch requirements
so shallow, an open-top wa[er bar is suggested to transpor[ runoff across [he access road.