Flood Hazard Analyses Upper Grand River, Jackson County, Michigan

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U.S. Soil Conservation Service, 1976 - Всего страниц: 58

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Стр. 6 - Base Flood means the flood which has a one percent chance of being equalled or exceeded in any given year (also known as a 100-year flood).
Стр. 6 - Also called bypass channel, flood way . flood routing — The process of determining progressively the timing and shape of a flood wave at successive points along a river.
Стр. 8 - Runoff is that part of the precipitation, as well as any other flow contributions, which appears in surface streams of either perennial or intermittent form. This is the flow collected from a drainage basin or watershed, and it appears at an outlet of the basin.
Стр. 7 - ... completely fills the voids of the bedrock and drift. ground-water level (water table). The level below which the bedrock or drift is saturated with water. Usually a subdued replica of the surface topography. ground moraine. Debris deposited underneath the glacier directly by the ice. hydrology. An earth science dealing with the occurrence and movement of water upon and beneath the land areas of the earth. ice-contact deposit. Material deposited by meltwater streams near or at the margin of a...
Стр. 8 - The time of concentration for a watershed is defined as the time required for water to flow from the most remote point of the watershed to the outlet.
Стр. 6 - Flood frequency A means of expressing the probability of flood occurrences as determined from a statistical analysis of representative stream flow records. It is customary to estimate the frequency with which specific flood stages or discharges may be equalled or exceeded, rather than the frequency of an exact stage or discharge. Such estimates by strict definition are designated "exceedence frequency," but in practice the term "frequency
Стр. 6 - Wind and water loading values shall each have a one percent chance of being equalled or exceeded in any given year (100year mean recurrence interval).
Стр. 5 - The lowest point of a bridge or other structure over or across a river, stream, or water course that limits the opening through which water flows. This is referred to as "low steel

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