First Colony Foundation Using Archaeology and Historical Research to Find Sir Walter Raleigh's Roanoke Island Colonies
In Search of the First Colony

Ditch Prism

Contents
The Earthwork
Ditch
Ditch Corner
Ditch Prism
Ditch Wedge
Wall
Wall Corner
Wall Prism
Wall Wedge
Results
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The ditch's prism sectors were in the shape of trapazoidal prisms. It was assumed that all of the sectors are the same width across and depth throughout, but the lengths vary for each sector. The minimum and maximum estimations of the length and volume of each sector can be found in the charts below.

The area of the cross section was found using the following information. It was assumed that the top, bottom, and depth of each sector were the same:

T(top)    B (bottom)   H(depth)
Cross Section(area) = H*(B +T)/2    *All estimates in ft, ft^2, ft^3

The volume of each sector was found by multiplying the area of the cross section and the length of each sector, which are found in the charts below. (Area of Cross Section * Length)

Sector Number Sector Length Sector Volume
1 19-21 551.76-651
3 10-13 290.4-403
4 14-16 406.56-496
6 12-14 348.48-434
7 4-6 116.16-186
9 19-21 551.76-651
10B 6-8 174.24-248
11 5-6 145.2-155
13 9-10 261.36-279
15 38-39 1103.52-1209
17 38-39 1103.52-1209
19 6-7 174.24-217
21 8-9 232.32-248
23 31-35 900.24-1085
25 35-43 1016.4-1333
27 5-6 145.2-186
30 17-18 493.68-527
31 18-20 522.72-620
Total Volume 8537.76-10137 ft^3
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