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2.52 2. To reduce the average distance water needs to be transported during the periods the sluice is able to spill water. This means that the main body of the volume stored in the internal system should be located as close as possible to the gate. Many ponds and channel sections are used for fish breeding. Nets are used to prevent the fish to be washed away. These nets might reduce the discharge capacity of the canals significantly when they are stretched from one side of the canal to the other. Here is a conflict of interest. Zoning might offer a compromise. If fish breeding can be restricted to the far end sections of the canals or even better in special ponds, the reduction in the drainage capacity of the system might be limited. Zoning is not necessary if the velocity of the flow in the canals of the internal system is low (less than 0.15m/sec) when the sluices are spilling at full capacity. In any case it is advisable to avoid nets right in front of the inflow of the sluice gate.
Chapter Three Effect of Cyclones on Kolkata and Surroundings 3.1. Hazard on urban habitation zones due to tropical cyclones The most important urban conglomeration within the easy reach of tropical cyclonic storms is the State Capital Kolkata. Contiguous with Kolkata proper is a large urban area that includes what is called the Greater Kolkata, including the relatively newly developed township of Bidhan Nagar (also called Salt Lake) and the upcoming Rajarhat development area. Presently, the Kolkata Municipal Corporation Area measures around 187.33 sq. km. According to the 2001 Census, the population of this region is around 45,80,544 and the area is divided into 15 Boroughs and 141 wards. According to historical according, Kolkata developed around three villages – Sutanuti, Kolkata, and Gobindapur. These villages occupied the following present day regional demarcations: CHAPTER 3 Sutanuti Kolkata Gobindapur Chitpur, Baghbazar, Sobhabazar & Hatkhola Dharmatala, Bowbazar, Simla, Janbazar Hastings, Maidan & Bhowanipur The newer additions to the Kolkata municipality are the following: North South East Sinthi, Cossipore & Gughudanga Tollygunge, Khidderpore & Behala Salt Lake , Beliaghata & Topsia The city on the west is bound by the river Hooghly. As such, an intense rainfall as during a tropical cyclone over this region means a lot of runoff since much of the areas has been paved with little or no scope for natural infiltration. Ironically, the terrain of the land slopes from the west, at the edge of the river Hooghly, towards the east. Further east are the scattered salty marsh lands crisscrossed by the different tidal streams and channels that are connected to the Bay of Bengal to the south. The important creeks here are the Matla, Bidyadhari, Kultigong, Ichhamati, Raimangal, etc. Of course, a small portion of the city, mainly to the south and closer to the river Hooghly drains to the west. However, whether the eastern tidal creeks, or the river Hooghly to the west, both are prone to water level variations of the ocean: the Bay of Bengal, to be precise. This rise of water levels in the rivers is due to either only tidal variations or that coupled with
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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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Page 16 and 17: 2.6 The most destructive element as
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Page 54 and 55: 2.44 • Transport the water to the
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Page 82 and 83: 3.20 the ocean level as a result of
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Page 86 and 87: 3.24 Table 3-9. Drainage basin area
Page 88 and 89: 3.26 will lead to significant impro
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Page 92 and 93: 3.30 Respectively. The discharge of
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Page 96 and 97: 3.34 Figure 3-10 shows the tail end
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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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6.13 Likewise, in all the embankmen
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6.15 Figure 6 -5 Figure 6 -6 Figure
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6.17 Benefit cost ratio Area benefi
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6.19 Location and cost of proposed
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6.21 Swaraupnagar Swaraupnagar 100
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6.23 Gobadia Kakdwip Dk Kasiabad &
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6.25 Location and cost of proposed
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6.27 " Jagaddal " 800 6400000 " Jag
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6.29
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6.31
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6.33
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6.35 Figure 6 -11 Figure 6 -12
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6.37 Figure 6 -15 Figure 6 -16
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6.39 Figure 6 -19 6.2.7. Recommenda
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6.41 4. Rajraj Swarup & Ramnagar Ab
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6.43 project. Such sediment deficit
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6.45 paludosa, Rhizophora apiculata
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6.47 15. Ceriops tagal 0.22 0.40 0.
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6.49 shelterbelt (average 100 m wid
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6.51 (assuming land acquisition cos
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6.53 location are missing reducing
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7.2 resulted in large scale waterlo
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7.4 5. No adverse effect in drainin
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7.6 15 LT Panel L.S. 2,200,000 16 I
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7.8 Bagjola, Kestopur and SWF chann
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Executive Cost Summary of Recommend
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References Kanjilal (2005) “Sunde
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“……………….Designingadis
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