Krishna River Floods 30 Sep To 07oct09

ANDHRA PRADESH 1 APSRAC

Eight districts are affected due to heavy rainfall and the resultant flood waters of Krishna and Tungabhadra rivers. The districts with number of mandals are Kurnool (25 mandals) Mahabubnagar (10 Mandals) Nalgonda (8 mandals) Krishna (18 mandals) Guntur (18 mandals) Kadapa (15 mandals) Prakasam (2 mandals) Ranga Reddy (5 mandals) Part of Kadapa district which is out side the Krishna river basin was affected due to overflow/diversion of flood waters into Kunderu river through Potireddipadu head regulator, K.C. Canal, In all the eight districts 571 villages are affected. Total population affected is 17.5 lakhs 3

NORMAL RAINFALL AND ACTUAL RAINFALL (4 DAYS) 5

Number of dams / barrages on Krishna river in Andhra Pradesh : Five Priyadarshini Jurala Sunkesula Ayacut Srisailam Dam Nagarjuna Sagar Prakasam Barrage Main inflows to Priyadarshini Jurala Dam (located in Mahabubnagar district) are from Narayanpur dam (Karnataka State) Inflows to Srisailam dam is from Krishna ( Priyadarshini Jurala) and Tungabhadra (Sunkesula anicut) rivers. The observed peak inflows (cusecs) at major dams / barrages are as follows. Srisailam : Maximum peak inflow : 25 lakhs c/s (30.09.09) Nagarjunasagar : Maximum peak inflow : 14.66 lakhs c/s(3.10.09) Prakasam Barrage : Maximum peak inflow : 11.03 lakhs c/s (6.10.09) 7

Rise in inflows and outflows at Priyadarshini Jurala are observed from 30.9.2009 to 03.10.2009. Rise in inflows at Srisailam dam are observed from 30-9-2009 to 03-10-2009 and outflows from 30-09-2009 to 04-10-2009. Rise in inflows in Nagarjunasagar Dam is observed on 30.9.2009 and rise in outflows started on 1.10.2009. The maximum inflow and outflow is observed on 05.10.2009. In case of Prakasam barrage rise in inflows and outflows started on 2.10.2009 and continued till 06.10.2009. 9

Kurnool, the district headquarters is located near the confluence of Tungabhadra and Handri rivers. The river Handri and Kurnool-Kadapa canal passes through the Kurnool town. The level of inundation in Kurnool town is extended upto about 902 ft contour against 885 ft FRL at Srisailam dam. The maximum extent of flooding occurred along Tungabhadra and Handri rivers inundating Kurnool town which is due to : a) Back water effect upto or slightly above 902 ft. b) Inflows of more than 2 lakh cusecs from Handri river 14

FLOOD AFFECTED AREA IN AND AROUND MANTRALAYAM 15

Alampur, a pilgrim centre, located in Mahabubnagar district adjacent to Tungabhadra river is highly damaged. The level of inundation in Alampur town is extended upto about 902 ft contour against 885 ft FRL at Srisailam dam. 18

The back waters of Srisailam dam released from Potireddipadu Head Regulator, KC Canal and Telugu Ganga canals, to the tune of above 2 lakh cusecs came into Kunderu river and caused flooding in Nandyal town (Kurnool district) and the down stream villages before joining Pennar River. Due to floods in Kunderu river 5 mandals in Kurnool district and 5 mandals in Kadapa district are affected. The extent of inundation is observed between 200m (Kunderu river bed level) and 205m contours in Nandyal town which is located along Kunderu river. 23

Various flood scenarios have been developed for the release of 10 lakh, 12 lakh, & 14 lakh cusecs of water at NSP using MIKE II hydrodynamic model. The flood scenario developed for the discharge of 12 lakh c/s at Nagarjunasagar project is close to to the ground reality. The likely flooding areas in the down stream of Nagarjuna Sagar Dam shows 13 mandals in Guntur district and 16 mandals in Krishna district . 25

The flood hazard map of Krishna and Guntur districts is prepared (early 1990s) based on geo- morphology, historical flood data, extensive ground truth information etc. The hazard map is superimposed with 1-5 km buffer zones (one km interval) along Krishna river. The list of villages located in each one km buffer zone, which are in highly flood prone areas, are provided to the Government for relief operations two days ahead of the deluge. 27

A breach in the flood bank of Krishna river is observed at Oleru village, Bhattiprolu mandal, Guntur district on 6.10.2009. Probable flood scenarios due to the breach were developed using flood models, elevation data, drainage, flood hazard maps and field experience. The probable flood affected habitations (22no.) were mapped and communicated to government for evacuation and relief operations on 06.10.09. The flood layer generated by NRSC using RISAT II (6.10.09) and RADARSAT (7.10.2009) data clearly confirmed that the habitations that were given on 6.10.09 are affected. 29

No. of villages in Nalgonda district : 85 No. of villages in Guntur district : 131 No. of villages in Khammam district: 14 No. of villages in Krishna district : 154 No. of villages in Guntur district : 191 No. of villages in Krishna district : 422 No. of villages in West Godavari district : 19 No. of villages in Nalgonda district : 10 No. of villages in Prakasam district : 1 No. of villages in Guntur district : 1 No. of villages in Kurnool district : 33 No. of villages in Mahabubnagar district : 60 31

Dam break analysis is attempted to map the probable inundation areas in the down stream of dams / barrage. This analysis is made based on volume of inflow / outflow, characteristics of each dam, contour, drainage, slope and historical data. The extent of land use / land cover classes likely to be damaged in the event of dam break is also mapped. 33

No. of flood affected villages/habitations in Guntur district : 103 No. of flood affected villages/habitations in Krishna district : 63 40

Flood affected villages in Krishna and Guntur districts MANDAL VILLAGE MANDAL VILLAGE MANDAL VILLAGE MANDAL VILLAGE MANDAL VILLAGE CHANDARLAPADU PENAMALURU ENAMALA KUDURU DACHEPALLE KATRAPADU KOLLUR CHINTHALLANKA AMARAVATHI AMARAVATHI USTEPALLE THOTLAVALLURU PAMULALANKA NARAYANAPURAM GAJULLANKA DHARANIKOTA KASARABADA PILLAVARI LANKA RAMAPURAM KOLLURU DIDUGU PUNNAVALLI POTTIDIBBA TANGEDA MALLADI DONEPUDI KODAVATIKALLU KALINDIDIBBA ELIAMPET MUNUGODU POTHARLANKA PONDUGALA PEDDA MADDURU VELADI KANIGIRI LANKA CHILUMURU LANKA MACHAVARAM GOVINDAPURAM PONDUGALA MULAKALAPALLI SUGGUNA LANKA SANGALLAPALEM VELLAMPALLI THUMMALAPACHIKA VYKUNTAPURAM IPURU LANKA GHANTASALA TURAKAPALEM LINGAYAPALEM SRIKAKULAM THULLUR VIJAYAWADA RURAL GOLLAPUDI GOLLAPALEM IBRAHIMPATNAM VEMAVARAM ABBARAJUPALEM KACHAVARAM JAGGAYYAPETA KOWTHAVARI PEDA LANKA AGRAHARAM ACHAMPETA GINJUPALLI BORUPALEM KETANAKONDA AVULA VARI PALEM AMBADIPUDI HARISCHANDRAPURA RAVIRALA MALALANKA M JUPUDI CHALLAGARIGA VEDADRI CHAMARRU JUVVALA PALEM THALLAYAPALEM CHILUKURU MUKTESWARAPURAM CHINTAPALLI KISHKINDAPALEM RAYAPUDI AVANIGADDA CHIRUVOLLANKA MULAPADU THADIKALAPUDI UDDANDA PUTTAGUDEM EDLANKA RAYUNIPALEM KOTIKALAPUDI KASTALA AGRAHARAM THIPPALA KATTA PULIGADDA VENKATAPALEM KOGANTIVARIPALEM THOKALAVANIPALEM IBRAHIMPATNAM CHALLAPALLI DUGGIRALA GODAVARRU AMUDALA LANKA KONUR SIVARAMA PURAM GUNTUPALLE MOPIDEVI BOBBARLANKA PEDA KONDURU MADIPADU KRISHNA NAGAR BANDIKOLLALANKA AGRAHARAM BELLAMKONDA BODANAM THUMMALAPALEM GUNTUR GUDEM ACHAMPETA TADUVOY KAMEPALLI K. KOTHAPALEM DAMULURU MUSTHAPHA NAGAR MANGALAGIRI BETHAPUDI CHITYALA MOPIDEVILANKA KANCHIKA CHERLA KOTHA GUDEM CHITYALA THANDA MOGULURU THADEPALLE PENUMAKA MOPIDEVI RAVI LANKA KETHAVARAM KOTHAPETA NAGAYALANKA UNDAVALLI NAGAYALANKA KOLLIPAR ATHALURIVARIPALEM KOLLURU TADEPALLI GANIATUKURU ELICHETLADIBBA A CHIRRAVUR ANNAVARAPU LANKA PULICHINTA NATCHUGUNTA BHATTIPROLU GORIGAPUDI SERI AMARAVARAM KOTHAVURU LANKA REPALLE NALLURU YESUPURAM PEDDALANKA BOMMUVARIPALEM CHODAYAPALEM CHEVITIKALLU OLERU KAMARAJUGADDA KUNIKINAPADU MACHERLA ECONAMPET PEDDAPULIVARRU ARAVAPALLI PESARLANKA GOPALAPURAM MUNNALURU BETHAPUDI CHINTAMOTU LAKSHAMINARASIMH KODURU BOBBARLANKA VISWANATHAPALLE APUR VEMAVARAM PAMIDIMUKKALA RAJUKALVA LANKAPALLE LANKA U.I GURAZALA GOTTIMUKKALA VELLATURU LANKAVANIDIBBA RAMAPURAM RAVIANANTHAVARAM PETERU SINGUPALEM Source: DMD, GoAP

Krishna River Floods 30 Sep To 07oct09

by Dr. N. Sai Bhaskar Reddy on Oct 27, 2009

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Krishna River Floods 30 Sep To 07oct09 Presentation Transcript