There are 3 feet to a yard, so there are 9 (3 x 3) square feet to a square yard, and 27 (3 x 3 x3 ) cubic feet to a cubic yard.
The ditch measures 1 x 1 x 135 = 135 cubic feet, so that is 135/27 cubic yards = 5 cubic yards.
about 71 cubic metres of gravel i think
To calculate the volume of gravel needed, first convert the dimensions to feet: 36 inches is 3 feet deep, and 16 inches is approximately 1.33 feet wide. The volume can be calculated using the formula for volume: length × width × depth. Therefore, the volume is 5,500 feet × 1.33 feet × 3 feet, which equals approximately 21,915 cubic feet of gravel needed to fill the ditch.
218.75 cubic feet or 8.1 cubic yards
To calculate the volume of gravel needed to fill a hole measuring 26 feet by 15 feet and 2 feet deep, you can use the formula for volume: length × width × depth. Thus, the volume is 26 ft × 15 ft × 2 ft = 780 cubic feet. Therefore, you would need 780 cubic feet of gravel to fill the hole.
Gravel is bought in cubic quantities, or by weight. You ask "to fill" but you only give a square measure. The volume of gravel required wil depends on the depth you wish the gravel to be. To fill 81 square metres to a depth of 5 cm would require 4.05 cubic metres of material.
it depends how thickly you lay it.
Volume required = pi*r2*h = pi*32*16 = 452.4 cubic feet
1 square foot = 144 square inches, so 100 square ft = 14400 sq inches. Multiply be 3 = 43200 cubic inches. I believe gravel is normally sold by the cubic yard. 1 cubic yard = (36 in)3 = 46656 cubic inches. So 43200/46656 = 0.926 cubic yards
16 cubic yards
using 3/4" rock fill 257' by 155' hole 2' deep
A standard bag of pea gravel typically contains about 0.5 cubic feet of gravel. Since there are 27 cubic feet in a cubic yard, you would need approximately 54 bags of pea gravel to fill 1 cubic yard. However, it's always a good idea to check the specific volume listed on the bag, as sizes may vary.
Another word for a deep ditch that is dug around a castle is a moat. You could call it a trench, or you could fill it full of water and call it a moat.