The measurement is taken from the point above grade at which height the foundation will be at completion, taking into account the type of foundation material and the frost line, and the depth of the crawl space or basement, if any.
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Measure the depth and width using the same units. Divide the depth measurement by the width measurement.
For the depth of water.
You could measure a puddle in various ways, which might, assuming basic instruments of measure are used, include:circumference or perimeter (linear measurement)color (subjective observatory measurement)color at different times of day and in different weather conditions, and so on (subjective observatory measurement)depth (linear measurement)surface area (area measurement)temperature of contents (Celsius)temperature of contents (Fahrenheit)time taken to be drunk by a dog of a particular age, weight and breed (time measurement)time taken to empty (time measurement)time taken to evaporate under various temperature controls (time and temperature measurement)time taken to fill (time measurementvolume of contents (capacity/volume measurement)weight of contents (weight/mass measurement)
The depth is neither the length nor width. Length is the measurement from top to bottom, width is from side to side, and depth is from front to back.
A error in measurement is when the measurement taken is not actually correct. For instance, you measure a gap as 49 centimetres wide. You cut the plank of wood to fit that measurement. Then discover the wood you have just cut is too wide to neatly fit the gap. There has been an error in the measurement you have taken.