1. BARBADOS BASIC FACTS AREA:- 170Sq Mls POPULATION:- 255,000 (1990)
GEOLOGY:- Limestone, Impermeable Sandstone, Shale, Marl
TOPOGRAPHY:- Undulating to max. of 1100 ft approximately
RAINFALL:- Average of ins per year
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2. NATURAL HAZARDS
HURRICANE:- Threatens all exposed structures including houses, commercial and public buildings, telecommunications towers, utilities, agriculture.
STORM SURGE: Hurricane related. Threatens most of the coastline especially the economically vital tourism plant and some critical lifeline facilities.
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3. NATURAL HAZARDS
TSUNAMI:- A threat to most of the coastal area outlined for Storm Surge.
LAND BORNE FLOODING:- Occurs in several areas across the island.
LANDSLIDES:- Concentrated mainly in the Scotland District. Covers 1/7 of the island. Consists mainly of impermeable sandstone, shale, marl.
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4. HAZARD / NATURAL REOURCES STUDIES
SCOTLAND DISTRICT ( 6 STUDIES )
STORM WATER DRAINAGE STUDIES (73, 94)
ENVIRONMENTAL AND NATURAL RESOURCES STUDY/PLAN (1998)
WATER LEVELS FOR BARBADOS (1994)
JAN 99 S/DIS’T DEVELOPMENT PROJECT
S/D SOIL CONSERVATION/ DEV STUDY 99
DRAFT NATIONAL PHYSICAL DEV. PLAN (FEB 98)
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5. DRAINAGE STUDY
Collect and analyse Data; (rainfall, runoff, flooding and land use for the period
Locate and study all flood prone sites within the study area and recommend practical solutions and effective flood control measures
Develop a Works Programme comprising the least cost design
Carry out an evaluation and assessment of the institutional requirements for O & M of present and future drainage works in B’dos
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6. SOME ELEMENTS EXAMINED
Confirmation of Drainage boundaries using; (topographic mapping, field reconnaissance, and air photos)
Determination of drainage characteristics; (area, length, topographic rise, slope, of impervious area, runoff coefficient).
Peak Flows at ; Culvert and Bridge locations were estimated and compared to expected flows to assess the flood potential. 2, 5, 10, 20, 25, 50, 100 year events were estimated
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7. HISTORICAL FLOOD AREAS
PRESCOT LAND/CONSTITUTION RIVER - St Michael
GRAME HALL - Christ Church
SPEIGHTSTOWN - St Peter
AQUATIC GAP - Christ Church
HOLETOWN - St James
BAYLAND - St Michael
WOTTON - Christ Church
GIBBES - St Peter
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8. FLOOD PLAIN AREAS
SPEIGHTSTOWN: From outlet to up stream of Round The Town bridge
HOLETOWN: From outlet to easterly limits of Jamestown Park
CONSTITUTION RIVER: From Duncan O’Neal bridge to Bridge Road
WESTON: From outlet upstream for 190 m
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9. CHARACTERISATION OF FLOOD AREAS
MAJOR FLOOD HAZARD AREAS: Generally located where significant economic losses could occur. Has large watershed areas, poses risks to life because of higher peak flows, higher runoff velocities and higher potential depth of flooding.
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10. CHARACTERISATION OF FLOOD AREAS
NUISANCE FLOOD HAZARD AREAS: Associated with smaller watersheds, shallower depths of flooding and reduced potential for injuries, loss of life and economic losses
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11. STRUCTURAL MEASURES CONSIDERED
WORKS PROGRAMME
STRUCTURAL MEASURES CONSIDERED
Construction of drainage channels
Use of reservoirs and quarries to control flood peaks
Construction of dykes and or upgrading of bridges, culverts, and other drainage infrastructure
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12. NON STRUCTURAL MEASURES
WORKS PROGRAMME
NON STRUCTURAL MEASURES
Revisions to legislation for mitigation of flood losses
Control of development in flood prone areas
Encourage alternative landuse and agricultural practices which promote flood mitigation
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13. WATER LEVELS FOR BARBADOS (1994)
RELATIVE SEA LEVEL RISE
TIDAL WATER LEVEL CHANGES
METEOROLOGICAL WATER LEVEL CHANGES
WAVE INDUCED WATER LEVEL CHANGES
TSUNAMI
DESIGN CRITERIA
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14. TERMS OF REFERENCE
Determine engineering methods of protecting, increasing and or stabalising the size of beaches along the west and south coasts
Prepare land use planning recommendations for the south and west coastal zones, on a stretch by stretch basis, based on the need to preserve and enhance the coastal resource within a national economic context
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15. OBJECTIVES
Determination of the normal and extreme levels of the astronomic tidal component
Analysis of any surge events that were present in the existing recorded tidal data
Examination of the wind and barometric components of hurricane related surge at several locations
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16. OBJECTIVES (cont’d)
Analysis of the wave-induced set-up and run-up, giving consideration to different shoreline, beach and structure characteristics at or near the shoreline
Quantification of the most up to date information on long-term sea level change
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17. SCOTLAND DISTRICT STUDIES
Geological Investigations of Ground Water Resources 46
S/D Development Study 79
Geology&Mineral Resource Assessment 82
S/D Soil Conservation Project
Water Resources Management & Water Loss Study 96
Field Guide to the Sub-Quanternary of B’dos 97
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18. POLICIES & PROGRAMMES
Prioritising of occupied spots for relocation of houses (Priority 1, 2, 3)
Down grading of specific roads in Priority 1 areas to maintain for agricultural purposes only
Consolidation and stabalisation of highways
Identification and redirection of streams
Reforestation of areas which held relocated houses
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