Final answer:
Flood size and impact are variable and do not necessarily adhere to specific acreage requirements. Terminology like '100-year flood' is based on statistical probability of occurrence, not on the size of the affected land area. Flooding can result from various conditions and their effects on the landscape and agriculture can be wide-ranging, not confined to specific acreage.
Step-by-step explanation:
If flooding is confined to one area, the flood water must cover one of the size options provided. However, the question does not provide information that aligns with any official criteria describing flood extent in terms of specific acreage it must cover. Floods can vary greatly in size and impact. A floodplain is an area that is prone to flooding but there's no specified size for an area to be defined as experiencing a flood. The terminology such as a '100-year flood' refers to statistical likelihood rather than prescribing that only one flood of a particular size will occur within a 100-year period. It means there is a 1% chance of a flood of that magnitude happening in any given year. In the field of study, there's a distinction between waterlogging and complete submergence, which could affect smaller or larger areas, depending on the situation.
Moreover, flooding in regards to cultivation and land impact does not have a specific acreage associated with its definition. For instance, weather records show a significant increase in flooding events which affect crop fields, demonstrating that floods with variable extents can both waterlog and completely submerge plants, depending on the water levels. Such conditions can leave longstanding impacts on rural areas and local agriculture.
The ability of soil to absorb and retain water plays a crucial role in mitigating floods. However, when soil's water retention capacity is lowered, as can happen with intensive cultivation, the risk of flooding increases. This doesn't necessarily correlate with a specific area of land being covered by floodwaters.