FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

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Volume II DESIGNING THE BUILDING 9 Pools and hot tubs have water pumps, piping, heaters, filters, and other equipment that is expensive and that can be damaged by floodwaters and sediment. All such equipment should be placed above the DFE where practical. Equipment required for fueling the heater, such as electric meters or gas tanks, should be placed above the DFE. It may also be necessary to anchor the gas tank to prevent a buoyancy failure. If buried, tanks must not be susceptible to erosion and scour and thus failure of the anchoring system. The design intent for concrete pools includes the following: Elevation of an in-ground pool should be such that scour will not permit the pool to fail from either normal internal loads of the filled pool or from exterior loads imposed by the flood forces. The pool should be located as far landward as possible and should be oriented in such a way that flood forces are minimized. One way to minimize flood forces includes placing the pool with the narrowest dimension facing the direction of flow, orienting the pool so there is little to no angle of attack from floodwater, and installing a pool with rounded instead of square corners. All of these design choices reduce the amount of scour around the pool and improve the chances the pool will survive a storm. These concepts are illustrated in Figure 9-33. A concrete pool deck should be frangible so that flood forces create concrete fragments that help reduce scour. The concrete deck should be installed with no reinforcing and should have contraction joints placed at 4-foot squares to “encourage” failure. See Figure 9-34 for details on constructing a frangible concrete pad. Pools should not be installed on fill in or near Zone V. Otherwise, a pool failure may result from scour of the fill material. For concrete pools, buoyancy failure is also possible when floodwaters cover the pool. In addition, flood flows can scour the soil surrounding a buried pool and tear the pool from its anchors. When this happens, the pieces of the pool become large waterborne debris. COASTAL CONSTRUCTION MANUAL Figure 9-33. Recommendations for orientation of in-ground pools 9-41
9 DESIGNING THE BUILDING Volume II Figure 9-34. Recommended contraction joint layout for frangible slab-ongrade below elevated building 9-42 COASTAL CONSTRUCTION MANUAL
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Coastal Construction Manual Princip
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All illustrations in this document
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PREFACE Volume II Chapter 8 - Site-
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1 CHAPTER TITLE Contents COASTAL CO
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Volume II CONTENTS Chapter 9. Desig
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Volume II CONTENTS Chapter 11. Desi
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Volume II CONTENTS 12.5 Water and W
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Volume II CONTENTS Table 10-9. Adva
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Volume II CONTENTS Example 8.4. Flo
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1 CHAPTER TITLE COASTAL CONSTRUCTIO
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Volume II PRE-DESIGN CONSIDERATIONS
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8 DETERMINING SITE-SPECIFIC LOADS V
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12 INSTALLING MECHANICAL EQUIPMENT
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13 CONSTRUCTING THE BUILDING Volume
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14 MAINTAINING THE BUILDING Volume
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Volume II RETROFITTING BUILDINGS FO
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1 CHAPTER TITLE Acronyms COASTAL CO
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Volume II ACRONYMS H HMA Hazard Mit
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Volume II ACRONYMS T TMS The Masonr
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GLOSSARY Volume II Basement - Under
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GLOSSARY Volume II Conditions Great
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GLOSSARY Volume II F Federal Emerge
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GLOSSARY Volume II G Gabion - Rock-
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GLOSSARY Volume II Location - The l
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GLOSSARY Volume II O Open foundatio
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GLOSSARY Volume II Risk tolerance -
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GLOSSARY Volume II safe living cond
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GLOSSARY Volume II Z Zone A - Under
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INDEX Volume II Building envelope,
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INDEX Volume II stillwater flood de
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INDEX Volume II Floodborne debris d
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INDEX Volume II I IBHS (see Insuran
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INDEX Volume II date of constructio
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INDEX Volume II Seawall, 7-7, 7-17,
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INDEX Volume II velocity pressure,
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FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

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