Cyclone and Storm Surge - Iczmpwb.org

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Executive Cost Summary of Recommendations All the projects recommended in this report for mitigating the ravages of cyclones on some districts of West Bengal and on the city of Kolkata and its adjacent urbanized areas, have been provided in the following table. The cost estimates are preliminary in nature and the amounts have been rounded off to respective Rupees in Crores. Proposals for the districts Sl. No. Proposal Amount in Rs. Crore 1 New revetments to existing embankments and repairs to existing embankments 2 Retirement (land-ward shifting) of existing embankments at critical locations 540 40 Executive Cost Summary 3 Mangrove plantation at locations between riverbank and embankments in the areas available to reduce the effect of river water erosion 4 Coastal protection: Sea facing embankments and beach protection to counter the effects of wave dash and shoreline recession 5 Shelter belt plantation in the region beyond the sea face to reduce the energy of the cyclonic storm after landfall 6 Construction of community cyclone/flood shelters at different locations to serve as refuge to cyclone affected people 7 Construction of community Animal shelters at different locations to serve as refuge to livestock 8 Construction of road links that may serve to connect regions presently not properly linked with mainland 9 Up gradation of existing road links to improve the connectivity within the region 10 Construction of new jetties and up gradation of the existing ones for improvement in waterway navigation 3 80 2 245 15 234 167 15 Total 1341
Proposals for Kolkata and surrounding urbanized areas Sl. No. Proposal Amount in Rs. Crore 1 Construction of pumping systems at different location to rapidly evacuate accumulated rain water from sudden cyclonic cloudburst; construction of sluice at mouth of Tolly’s nullah 2 Dredging of final water disposing channel – River Kultigong, which has reduced in section with time 3 Dredging of the three water conveying channels – Bagjola canal, Kestopur canal and SWF channel 89 50 94 Total 233 Thus, adding up the costs of the two sub-parts of the above recommendations, it is estimated that an amount of Rs. 1574 Crore is required for mitigating the effect of tropical cyclonic storms in the state of West Bengal.
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HAZARD ASSESSMENT AND DISASTER MITI
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Project Team Though the outcome of
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Preamble The State of West Bengal,
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1.2 IMD, in its website (http://www
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1.4 5. Proposals for location of cy
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2.2 region is that which struck the
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2.4 Figure 2-2. Track of the 1970 B
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2.6 The most destructive element as
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2.8 the two regions is rather diffe
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2.10 2.4. The eastern coastal zone
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2.12 velocity is first checked. As
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2.14 Strong winds known as cyclones
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2.16 2.4.6. Soil characteristics Th
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2.18 All rivers have in general sou
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2.20 Another interesting feature of
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2.22 formed does not pose so much o
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2.24 2.4.11. Forest composition The
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2.26 Canning (Bidyadhari Outfall in
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2.28 Administrative information Pop
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2.30 Mangrove plantation beyond the
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2.32 A retired embankment of river
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2.34 The beaches are flattened by s
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2.36 of a doiminant tidalbasin of t
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2.38 primary mode is centered on th
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2.40 Aquaculture ponds located betw
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2.42 All the islands are situated w
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2.44 • Transport the water to the
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2.46 The other type of failure may
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2.48 channel floor, some of the riv
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2.50 embankments. Crops and propert
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2.52 2. To reduce the average dista
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3.2 a storm surge caused by a tropi
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3.4 these merchants may have been t
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3.6 Figure 3-1. Map of India during
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3.8 larger volume of sewage and dra
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3.10 receive, at least during the r
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3.12 3.9. Drainage scheme of Dr. B.
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3.14 3.10. CMPO and KMDA (originall
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3.16 Flows are diverted to the loca
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3.18 the Bhangar region through the
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3.20 the ocean level as a result of
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3.22 Table 3-6. Major pumping stati
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3.24 Table 3-9. Drainage basin area
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3.26 will lead to significant impro
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3.28 locks, one at Chitpur and anot
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3.30 Respectively. The discharge of
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3.32 Figure 3-6. The downstream of
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3.34 Figure 3-10 shows the tail end
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3.36
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3.38
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4.2 In US, there is a steady decrea
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4.4 This shows that Orissa (with 10
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4.6 30 25 20 15 10 Severe Cyclone C
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4.8 Table 3: Return periods of cycl
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4.10 Table 5: The number and return
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4.12 work station (the Automated Tr
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4.14 through this trough into the d
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4.16 Mean Low water 1.51 1.39 1.34
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4.18 τx,τy : x and y components o
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4.20 formulation. However, the rete
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4.22 ∂u ~ ∂ ~ ~ ∂ ~ ~ ∂ζ 1
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4.24 Δ p p(r) = p( ∞) − [1+ (r
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4.26 maximum surge for this event w
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4.28 U-Component of Velocity (Surfa
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4.30 ## ## ## #### ### ## ########
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4.32 V-component of Velocity (Surfa
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4.34 U-component of Velocity (Surfa
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## ################################
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4.38 V-Component of velocity (Surfa
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5.2 particular human settlement to
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5.4 The Composite Vulnerability Ind
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5.6 (2004 prices) prevalent in dist
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5.8 Moyna 0.6280 0.1592 0.542286 0.
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5.10 5.4.2. Social infrastructure H
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5.12 Budge-Budge(Part-II) 0.0000 0.
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5.14 secondary and tertiary activit
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5.16 F i Fˆ i ⎛ Total no. of =
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5.18 Table 5-4: Composite Index of
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5.20 M ′ = H M ′′ = I . S whe
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Chapter Six Mitigation Strategies a
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6.3 Beside these differences in lev
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6.5 • to reduce the destructive f
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6.7 6.2.4. Methods of Construction
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6.9 is attached to the structure. T
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6.11 (b) Medium rivers to armour th
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Page 194 and 195: 6.35 Figure 6 -11 Figure 6 -12
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Page 198 and 199: 6.39 Figure 6 -19 6.2.7. Recommenda
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Page 220 and 221: 7.8 Bagjola, Kestopur and SWF chann
Page 224 and 225: References Kanjilal (2005) “Sunde
Page 239: “……………….Designingadis
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