SOP for Flood Forecasting & Early Warning - UNESCO Islamabad

More documents

Recommendations

Info

$Math Lesson Plans level 4 Term 1$

case it starts to intensify, the chances of recurring shall increase and as it starts to move northwards, occurrence of flood may become imminent. Consequently, this is another important stage when another' Alert' is issued. This is a more alarming' Alert' than the previous one and is called "Yellow Alert". In case the low/depression starts to directly affect the catchment area and the heavy flood producing rains start, a 'Red Alert' is immediately issued. Quantification of the flood peak can only be done after the total storm rain becomes available. This, however, may be too late for rescue purposes as the time to peak flood, after the rain, is relatively small in case of most of the rivers on account of steep slope of the upper catchments. Thus, three qualitative flood forecasts called Blue, Yellow and Red alerts are issued to alert the concerned Government agencies. Typical formats of the three colour coded messages is given below. BLUE ALERT A monsoon low/depression arriving from Bay of Bengal has reached the Indian state of (Rajasthan/Haryana etc) and at present is located near _____________. Possibility of this low/depression moving towards the upper catchments of the Indus Basin rivers, to cause flood producing rains has now developed. Situation is being watched and further information shall follow as required. YELLOW ALERT Monsoon low/depression has now started to move north/northeast towards the country. Risk of heavy flood generating rains over the upper catchments of rivers _______________ has increased during the next 1 to 3 days. RED ALERT From 0700 to 1400 hrs _____________ inches/mm approx. of rainfall has fallen in the catchment areas of rivers Indus/Jhelum/Chenab/Ravi/Sutlej. High/Very High / Exceptionally c:\documents and settings\administrator\desktop\cd material nust\international training workshop\session 5\2_sop pmd_51 pages.doc
High/Critical flood equivalent to ___________ to _____________ cuses is likely at ____________________________________________ during next 12/24/36/48 hours. 2.3.2 Quantitative Food Forecast Routine Daily Flood Forecast (RDFF) Routine daily flood forecast is issued once a day and is based upon the discharge measurements of 0600 hrs (PST), latest APT picture, date of Lahore, Sialkot, Mangla and Islamabad radars, and the Indian discharge data as received through PCIW. The forecast is issued before the mid day for 24 hrs period. The flood forecast has seven parts issued in two Bulletin A & Bulletin B. The Bulletin A contains five parts. The first part is the general situation of river flows describing the level of rivers in plain language. It also contains the future trend in the river flow at any gauging site. The second part gives the meteorological features i.e. the prevailing synoptic situation and weather pattern. The third part is the weather forecast expected during next 24 hours. The emphasize should be on rain. The fourth parts contain the amount of rainfall recorded during the last 24 hours in the country. The fifth part gives the general weather outlook next 48 hours. The forecast is generally rain oriented. The sixth & seventh parts are included in the Bulletin B. The sixth parts contain the weather / rain forecast in the upper catchment areas and in the lower catchment areas of all the rivers. The upper catchment is the area above rim stations and lower catchment is the areas below rim stations. The seventh and important part in main flood forecast. This is the quantitative forecast of river flows at 22 sites including rim stations. First two columns indicate the rivers and their gauging sites. Third column is design capacity i.e the maximum flow that can pass through the particular site without any damage. The sixth & seventh column indicates the expected range of the river flow in cusecs & corresponding flood level. The last & eight columns show the level of very high flood flow at particular site. (Forecast Bulletins A& B attached as Annex- 7&8) c:\documents and settings\administrator\desktop\cd material nust\international training workshop\session 5\2_sop pmd_51 pages.doc
Page 1 and 2: c:\documents and settings\administr
Page 3 and 4: Introduction Planes of Pakistan hav
Page 5 and 6: Chapter 1 Flood Causes & Management
Page 7 and 8: Table 1.3 S.No. Flood Limits NAME O
Page 9 and 10: c. Continue moving in the northerly
Page 11 and 12: the financial and technical support
Page 13 and 14: Heaviest and the most frequent summ
Page 15: i) Qualitative flood forecast ii) Q
Page 19 and 20: ) Areal Flood Inundation Flood Fore
Page 21 and 22: Chapter 3 Responsibilities of the F
Page 23 and 24: placed in the forecasts issued by C
Page 25 and 26: especially in respect of the river
Page 27 and 28: season. During the flood emergency,
Page 29 and 30: the Engineers. Lack of understandin
Page 31 and 32: FFC was established in 1977 to prov
Page 33 and 34: Sukkur and Kotri barrages were rece
Page 35 and 36: appropriate recipient: the flood fo
Page 37 and 38: FLOOD ROUTING THROUGH MANGLA RESERV
Page 39 and 40: Annexture-5C FLOOD ROUTING THROUGH
Page 51: c:\documents and settings\administr

SOP for Flood Forecasting & Early Warning - UNESCO Islamabad

Create successful ePaper yourself

Delete template?

Save as template?