1987-03-10_PERMIT FILE - C1981008A

• Permit No: C1981008A
• IBM Index Class Name: PERMIT FILE
• Doc Date: 3/10/1987
• Doc Name: Application & Table Of Contents
• Media Type: D
• Archive: Yes

NUCLA PR NO. 2
natural in-place densities can range in the area of 90-110 pounds per
cubic feet. Sediment in a pond can range from 80-100 pounds per cubic
feet depending on water content, organic content, coal content and
particle distribution of the sediment, etc. Based on Lara and Pemberton
(Design of Small Dams) equation the following calculations can be
performed.
Assumptions:
Sandy Loam (Tab 9) :
% clay = 5% = pc
% silt = 25% = pm
% sand = 70% = ps
Operation Type (1) = Sediment always submerged or near submerged.
eq. W = We (pc) + Wm (pm) + Ws (ps)
3
We = 26 lb/ft
3
Wm = 70 lb/ft
3
Ws = 97 lb/ft
W = 26 (0.05) + 70(0.25) + 97(0.70)
3
W = 1.3 + 17.5 + 67.9 + = 86.7 lb/ft
Miller (Design of Small Dams) developed an equation for determining the
average density of all sediment deposited in T years of operations of a
reservoir as follows:
T
WT = W1 + 0.4343 K T-1 (loge T) - 1
where:
3
W1 = 86.7 lb/ft
K = Ks(ps) + Km(pm) + Kc(pc)
K = 0(0.70) + 5.7(0.25) + 16.0(0.05)
K = 0 + 1.4 + 0.8 = 2.2
T = 2 years
2
W2 = 86.7 + 0.4343(2.2) [2-1 (loge 2) - 1]
3
W2 = 86.7 + 0.96 [0.386] = 87.1 lb/ft
3
Use 87 lb/ft
20