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<br /> <br />CHAPTER III <br /> <br />ELEVATION AND ANCHORING TECHNIQUES <br /> <br />ELEVATION AND ANCHORING <br />TECHNIQUES <br /> <br />Site-specific flood information is critical when <br />considering a siting strategy for a manufactured <br />home or manufactured home community, In some <br />cases, the information gathered may ultimately <br />result in a decision against siting in the area or <br />may indicate that no additional flood-related <br />safeguards are necessary, <br />- --This chapter outlines general techniques which <br />focus on elevating the manufactured home in <br />riverine or coastal flood[Qg areas, Chapter IV PLO- <br />vides specific criteria and calculational procedures <br />to address the capability of the design techniques <br />to withstand anticipated flood and wind loads, <br /> <br />ELEVATION ON FILL <br /> <br />Earth fill, shown in Figure 3,1, is a widely used <br />elevation technique that, with proper construction <br />practice and materials, can be' a means of <br />elevating a manufactured home above flood levels, <br /> <br /> <br />Figure 3.1 Earth Fill <br /> <br />Fill should not be used in areas subject to flood. <br />waters having a velocity greater than 10 feet per <br />second (fps) due to the risk of scour and erosion <br />and subsequent foundation failure, In addition, fill <br />should not be used where it will constrict the flow <br />of floodwaters and cause increased flood eleva- <br />tions or velocity, <br />Advantages of fill include its appearance, abil- <br />ity to improve access to the manufactured home, <br /> <br />ability at some sites to connect the filled area to <br />higher ground for emergency evacuation in a <br />flood, and protection of building elements from <br />deterioration caused by exposure to floodwaters, <br />If the desired elevation is achieved by earth fill <br />and floodwater is not anticipated under the <br />manufactured home, a conventional installation <br />can be implemented, as shown in Figure 3,2, in <br />accordance with the manufacturer's instructions <br />and state or local installation standards as dis- <br />cussed-in-Chapter-f:--:- <br /> <br /> <br />Figure 3.2 Earth Fill and <br />Conventional Installation <br /> <br />If elevation by earth fill is being considered as <br />a partial solution with floodwater anticipated over <br />the fill, as shown in Figure 3~3, the manufactured <br />home will have to be elevated and anchored us- <br />ing techniques presented later in this chapter. In <br />this situation, the earth fill will have to be selected <br />and placed in consideration of soil saturation and <br />any anticipated floodwater velocity, <br />In the manufactured home community shown <br />in Figure 3.4, new sites were being developed, A <br />review of flood history showed recurrent flooding <br />with low velocity and three to four foot depths, By <br />elevating the new sites with two feet of earth fill, <br />a conventional installation was used and the oc- <br />cupied portion of these homes is now protected <br />during flooding, <br /> <br />19 <br />