Cyclone and Storm Surge - Iczmpwb.org

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7.6 15 LT Panel L.S. 2,200,000 16 Instrumentation L.S. 600,000 17 Communication Facilities L.S. 100,000 18 Miscellaneous Facilities L.S. 367,000 Installation and Commissioning charges Mechanical 1,900,000 SubTotal (Rs.) 83,133,000 Add 5% for Contingency (Rs.) 4,156,650 B. Civil Works Sl. No. Item Unit Quantity Rate in Rs. Amount in Rs. 1 Sump construction No. 15 1,400,000 21, 000, 000 2 Pump house construction m 2 9600 1,330 12,768,000 3 Retaining wails in Fore Bay LS 4,800,000 4 Retaining walls in Energy Dissipator LS 5,000,000 5 Paving of Forebay LS 800,000 6 Paving of Energy Dissipator Bay LS 2,000,000 7 8 9 10 11 Earthwork in Sump, Forebay & Energy Dissipator bay LS 2,900,000 Earthwork in inlet Channel with side and bed lining LS 6,300,000 Shoring & Sheet Piling for Construction of Sump and Retaining LS 5,000,000 Cross Bunds Construction, maintenance & removal LS 670,000 Block Pitching on Slope including Toe Wall up-stream of Forebay Sq.m 3000 600,00 1,800,000
7.7 12 Excavation of Channel Down Stream with side & bed lining and protection at LS 5,700,000 13 th Bridge tfdownstream ll i l di th of pump t house ti t m 36 100,000 3,600,000 14 Concrete /Metalled road Sq.m 1200 800,00 960,000 15 Boundary wall m 180 3,000,00 16 Sub-station Building (Electrical) L.S 3,500,000 17 Gates Sq.m 40 1,600,00 64.000 18 Guard posts on road Each 16 1,040 16,640 19 Soil Investigation & Survey LS 100,000 SubTotal 77, 518, 640 Add 5% for Contingency (Rs.) 3,875,932 Total of Civil Works (B) 81,394,572 Grand Total ( A + B) 178,684,222 Say, Rs. 18 Crore 7.4. Recommendations for water conveyance It has been explained how the river Bidyadhari, which used to convey the sewage and storm water of Kolkata more than a century back had become choked with sediment and silt over the years forcing Dr. B N Dey to suggest a 35 km long water disposal channel to the river Kultigong. It is apparent that the untreated sewage that has been disposed off into the river Kultigong has caused it to reduce in cross section over the years (Table 3-3). It may not be very far fetched to imagine that this river is likely to get choked in another 50 years’ time, unless some action is taken now to correct it. As may be apparent, once the riverbed level of Kultigong rises, the tidal lockage period is likely to increase due to the rise of the high tide levels, which has to be countered by setting up further high capacity pumps at the outfall points of the drainage disposal channels. In the event of a high precipitation (as during a cyclonic storm) the city of Kolkata and its surroundings discharging storm water through the Bagjola, Kestopur and SWF channels would face a difficult situation of storm water disposal and may be waterlogged for more than a day in much of its parts. This is because, the storm water that would be carried down these channels may have difficulty in discharging into the Kultigong as its water level is expected to be reigning high at this time by an action of high tide and storm surge. The effect of the river Kultigong reflecting upon the water disposals of
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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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Page 222 and 223: Executive Cost Summary of Recommend
Page 224 and 225: References Kanjilal (2005) “Sunde
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