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<br />'11 <br /> <br />-- <br /> <br />Habitable Room - A space used for living, sleeping, eating or cooking, or combination thereof; <br />but not including bathrooms, toilet compartments, closets, halls, storage rooms, laundry and <br />utility rooms, cellars, and similar spaces, <br /> <br />Human Intervention - Activation of flood protection systems by manual effort during floods as <br />opposed to activation by automatic means, <br /> <br />Hydrodynamic loads - Forces imposed on structures by floodwaters due to the impact of <br />moving water on the upstream side of the structure, drag along its sides, and eddies or <br />negative pressures on its downstream side, <br /> <br />Hydrostatic loads - Forces imposed on a flooded structure due to the weight of the water. <br /> <br />Infiltration - The flow of fluid into a substanc<~ through pores or small openings. The term is <br />commonly used to denote the flow of water into soil. <br /> <br />Impact loads - loads induced on a structure by solid objects carried by flood water, They <br />can include trees, [umber, displaced sections of structures, tanks, mobile homes, and chunks <br />of ice, Impact loads are difficult to predict accurately, yet reasonable allowances must be <br />made for them in the design of potentially affected structures. <br /> <br />level (Degree) of Protection - The greatest flood level against which a protective measure is <br />designed to be fully effective; often expressed as a recurrence interval (e,g., 1 DO-year level <br />of protection) or as an exceedance frequency (e.g., one-percent chance of exceedance). <br /> <br />local Scour - The scour that occurs at an obstruction in the flow is called scour. The [ocal <br />scour is due to the reduction of flow area and the resultant increase in velocity, <br /> <br />Mean Diameter - Is the diameter where 50 percent of the material has smaller diameters and <br />50 percent have larger (based on weight). <br /> <br />Mudslide (i.e. mudflow) - A condition where there is actually a river, flow or inundation of <br />liquid mud down a hillside usually as a result of a dual condition of [ass of brush and the <br />subsequent accumulation of water on or under the ground (frequently caused by a period <br />of heavy or sustained rain), A muds[ide may occur as a distinct phenomenon while a <br />landslide is in progress and wi [I be recognized as such by FEMA only if the mudflow, and <br />not the landslide, is the proximate cause of the damage that occurs. <br /> <br />Nonstructural Measures - AI[ f[ood plain management measures excepting structural flood <br />control works. Examples of nonstructura[ measures are flood warning/preparedness systems, <br />relocation, f[oodproofing, regulation, land acquisition, and public investment policy, <br /> <br />One-Hundred Year Flood -A f[ood having a one-percent chance of occurring in any given year <br />and which, over a very long period time, can be expected to be equaled or exceeded on <br />the average of once very hundred years, <br /> <br />Permeability - The property of soil or rock that allows passage of water through it. <br /> <br />Profile - A graph or plot of the water surface elevation against distance along a channel. A[so <br />termed "f[ood profi[e" if drawn for a specific flood or [evel of flooding, <br /> <br />Recurrence Interval - A statistical expression of the aveage time between floods equaling or <br />exceeding a given magnitude (see f[ood frequency). <br /> <br />Regulatory Flood - Same as BFE when approved by CWCB and adopted by local community, <br /> <br />Regulatory Flood Datum (RFD) - Is the BFE plus aile foot free board. <br />