Abstract ID- Th2-A002 How monthly distribution of monsoon rain in district affected reservoir water-Case studies towards fulfilling better users need ANCHAL KUSHWAHA, JYOTI SONAR AND A.KASHYAPI Weather Forecasting Division , Climate Research & Services, IMD, Shivaji Nagar, Pune 411005 ([email protected]/[email protected]/[email protected])

Introduction Fig.3a Case study for the period of early August Results 2020 05.08.2020 06.08.2020 07.08.2020 08.08.2020 MEAN 80 This year the State of received normal 73.8 rd th 70 ➢Case study (1)during 3 June to 5 June 2020

rainfall(+16%)while Madhya Maharashtra received excess 59 60 revealed that the mean rainfall for for the rainfall (+29%)as well as Pune district also received excess 50 48 period of consecutive3 days was 36.99 mm / day which rainfall(+40%). Though during early June, because of very 40 resulted in 23.33 % of Dam recharge .

30 RF in mm in RF severe cyclonic storm Nisarga, Pune received very good 24.1 rd th 20 20.07 ➢Case study (2) during 23 July to 26 July 2020 amount of rainfall which resulted in partial dam water 11.4 11.8 16.02 13 10 8.3 7.6 3.4 revealed that the mean rainfall for Pune district for the 1.6 0.9 2 recharge(as observed in Panshet dam) as reflected on 0 PUNE(RF.MM) LOHEGAON(RF.MM) PASHAN(RF.MM) period of consecutive4 days was 17.45 mm / day which 10th June (Table 1).However, rest of June and early period stations resulted in 40.42% of Dam recharge. of July, rainfall was not good enough .This created a little ➢Case study(3a) during 5th August to 8th August 2020 bit of panic in the minds of different users as well as local Fig.3b Case study for the period of August 2020 revealed that the mean rainfall for the period of governing bodies (viz. Pune Municipal Corporation, 13.08.2020 14.08.2020 15.08.2020 16.08.2020 17.08.2020 mean consecutive 4 days was 20.06mm / day which resulted in Municipal Corporation and Central 25 22.1 22.3 70.75 % of Dam recharge . Water Commission Pune). Even plan for artificial rain was 21.3 21.4 th th 20 18.9 ➢Case study(3b)during 13 August to 17 August 18.5 18.4 there in the card of local governing bodies. During this 17.8 17 2020 revealed that the mean rainfall for Pune district for period, when local authorities from local governing 15 the period of consecutive 5 days was 15.34 mm a day

12.2 mm

bodies approached CR&S, IMD Pune, the Scientists RF

in in which resulted in 100 % of Dam recharge . 10 8.4 8.8 conveyed details about the forthcoming rain possibility 7.6 8 7.5 ➢Case study(4)during 9th September to 12th and ultimately rain realized in the pattern in which IMD 5 September 2020 revealed that the mean rainfall for predicted/ forecasted. Pune district for the period of consecutive 4 days was 0 PUNE(RF.MM) LOHEGAON(RF.MM) PASHAN(RF.MM) 17.57mm a day which maintained100% of Dam recharge Objectives stations till end of the season . Because of this time to time good rainfall, ultimately the dam recharge for Pune district was ➢Early erratic pattern in Pune district created panic among 100 % of its capacity. users. Even plan for artificial rain was thought of. This Fig.4 Case study for the period of encouraged the authors to take up the study. September 2020 09.09.2020 10.09.2020 11.09.2020 12.09.2020 mean ➢How the sequence of consecutive days of mostlty 50 46 45 39 38.8 Conclusions moderate rain in and around Pune during June to 40 38.2 35 30 24 September and How the recharge of Panshet dam takes 25 20 15 13 place is the focus of the study. mm in RF 10 6.1 5 2.7 1.2 0.6 1 0.3 ➢ There was panic button due to erratic rainfall but 0 PUNE(RF.MM) LOHEGAON(RF.MM) PASHAN(RF.MM) because of time to time light to moderate rain in and stations Methodology & Study area around Pune resulted in 100% dam recharge. ➢ Accurate forecast as well as time to time warnings as ➢ This study about the sequence of consecutive days of Panshet Dam Reservoir recharge well as special advisiories for Pune districts by IMD mostly moderate rain in isolated areas in and around ( in percentage) Dam Reservoir percentage recharge Pune gave total relief to the local authorities and other Pune district during June to September, 2020 and 120 users. recharge of Panshet dam (which supplies water for Pune 100 district) from time to time basis. 80 60

➢ Month wise case studies were undertaken to observe the 40 dam recharge step-wise. 20 Acknowledgements &Literature cited 0 3/6/2020 10/6/2020 15/07/2020 29/07/2020 5/8/2020 12/8/2020 19/08/2020 16/09/2020 ➢ Daily rainfall values were considered. The consecutive Reservoir of Percentage Dates days high rainfall values were considered for case studies in different months. Table 1. Case studies of rainfall in various Acknowledgements- locations of Pune district and Panshet dam ➢ During end of each of the peak rainfall period, the levels Authors like to express sincere thanks to the Head CRS, recharge (in %) of panshet dam was checked through IMD Pune for his continuous encouragement. They are punefloodcontrol.com and updated rise in levels of water DATE PUNE LOHEGAON PASHAN Panshet Reservoir thankful to Mr. Sanjay Shelar WFD, IMD Pune for his are presented in month wise case studies. (RF.MM) (RF.MM) (RF.MM) recharge (%) assistance. Case study 1 03.06.2020 44.1 97.3 37.6 3.32 (3rd June) Literature cited Fig.1 Case study for the period of June 2020 04.06.2020 43.1 31.4 44.0 05.06.2020 7.0 19.7 8.8 ➢ Rao Y. P. (1976), Meteorological Monograph Synoptic 03.06.2020 04.06.2020 05.06.2020 mean MEAN 31.40 49.46 30.13 23.33 (10th June) Meteorology, No. 1/1976, pp. 1-379 120 Case study 2 23.07.2020 1.5 25.0 0.8 35.54 (15th July) ➢ http://punefloodcontrol.com/bhima_basin_RESERVOIR_ 100 97.3 24.07.2020 7.6 14.4 7.0 WATER_LEVEL_REPORT.aspx.

80 25.07.2020 31.5 6.0 24.1 26.07.2020 36.8 31.0 23.6 ➢ Kashyapi A (Scientist F), Weather forecast, their types 60 MEAN 19.35 19.10 13.90 40.42 (29thJuly ) tools use by IMD, short and medium range forecast,

RF in mm in RF 44.1 43.1 44 Case study 3a 40 37.6 weather products (SRF model; WRF products, MRF 31.4 05.08.2020 59.0 48.0 73.8 47.79 (5th August) 19.7 20 06.08.2020 11.4 11.8 13.0 model: GFS GEFS products), weather warnings and their 7 8.8 07.08.2020 8.3 3.4 7.6 interpretation, Training Program for Hydro-Met (HM) 0 PUNE(RF.MM) LOHEGAON(RF.MM) PASHAN(RF.MM) 08.08.2020 1.6 0.9 2.0 stations Cadre of Central Water Commission PAMET (27 May to MEAN 20.07 16.02 24.10 70.75 (12th August) Case study 3b 07 June) pp. 1-26 Fig.2 Case study for the period of July 2020 13.08.2020 7.5 8.4 8.0 23.07.2020 24.07.2020 25.07.2020 26.07.2020 mean 14.08.2020 18.5 17.0 22.1 40 36.8 15.08.2020 21.3 21.4 22.3 35 16.08.2020 18.9 17.8 18.4 31.5 31 30 17.08.2020 7.6 12.2 8.8 25 th 25 24.1 23.6 MEAN 14.76 15.36 15.92 100(19 August) Annual Monsoon E Workshop ( AMW 2019 2020) Case study 4 20 19.35 19.1 & RF mm in 14.4 09.09.2020 1.2 46.0 0.3 15 13.9 10.09.2020 39.0 0.6 6.1 National E Symposium on “Cloud and Precipitation 10 7.6 7 11.09.2020 2.7 1.0 13.0 6 Processes” 5 12.09.2020 38.2 24.0 38.8 1.5 0.8 0 MEAN 20.27 17.90 14.55 100(16th September) PUNE(RF.MM) LOHEGAON(RF.MM) PASHAN(RF.MM) JANUARY 18-20, 2021, Pune, Maharashtra, stations