Bologna is home to numerous prestigious cultural, economic and political institutions as well as one of the most impressive trade fair districts in Europe. In 2000 it was declared European capital of culture and in 2006, a UNESCO âcity of musicâ.ologna is also one of the wealthiest cities in Italy, often ranking as one of the top cities in terms of quality of life in the country: in 2011 it ranked 1st out of 107 Italian cities.
Add topsoil to achieve a total topsoil depth of 10-15 cm (4-6 inches), after firming. The topsoil should be a loamy sand, sandy loam, clay loam, loam, silt loam, sandy clay loam or other soil suitable for the area.
Since we know the Square feet of the garden, we now have the conversion to Cubic feet: (cubic feet) = (square feet)  (height in feet) So.... If you wanted the topsoil to be 3 inches thick, you would need: 12  0.25 = 3. You would need 3 cubic feet of topsoil. Notice that I convert 3 inches to 0.25 feet before using the formula. All the measurements must be in the same units for it to work. And it will work for anything.