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Figure 1.18 Elevation Using Wood Foundation These include inundation with water, uplift and movement of the manufactured home from its foundation, and debris impact on the foundation and manufactured home, Riverine Flooding-A region's watershed, shown in Figure 1,20, is the natural drainage basin that conveys water runoff, Water that is not ab- sorbed by the soil and vegetation becomes sur- face water runoff, seeking the natural drainage lines according to local topography, (--.;' ~ ' ,,\, Elevating alternatives and related anchoring ......<:" _ _ __ ____tecbniques_are.presenteciin.detail in.Chapter.lU.n _ _ n _ ____ EFFECTS OF FLOODING ON MANUFACTURED HOMES Manufactured homes in flood hazard areas may be affected by a variety of conditions that vary in intensity from site to site. Flood forces and parameters are presented in detail in chapter two of the manual. The following provides an introduc- tory overview of the types of flooding and their ef- fects on manufactured homes which are install- ed using the conventional set-up techniques discussed above, There are two general flooding types-riverine and coastal. Each environment exhibits physiographic features that determine the magnitude, duration, and frequency of floods, Flood characteristics, especially the significant parameters of depth and velocity, produce con- ditions that can adversely affect manufactured homes, as shown in Figure 1,19, Figure 1.19 Flood Damage Figure 1.20 Watershed ThesEtlines merge to form a hierarchical system of streams that includes swales for drainage chan- nels, creeks, and rivers, each of successively larger capacity, The primary element of a stream is the chan- nel, which carries the normal flow of water, The area of flat or gently sloping land adjacent to the channel, as shown in Figure 1,21, is the fioodplain, Figure 1.21 Floodplain 8