Thank you for all for the responses! Hi Nikhil, It's not sea level rise that worries me for Pune, because Sahyadri stands in between. It is a possible breach of the dams that control the waters flowing into Pune rivers. Panshet is 46 yeard old (rebuilt after it broke in 1961), Mulshi is 91 years old and Khadakwasla is 146 years old! The average lifespan of a dam is 50 years, max 100 years. Even without a dam breach, in case of extremely high rainfall in the catchment regions there is a risk of the dams suddenly discharging more water than is the capacity of the rivers in the city, thanks to all the encroachments and pollution.
PMC has published floodline maps in PDF form on this website <http://www.punefloodcontrol.com/maps.html>. Is there a way to get the dataset behind these maps so that such a visualization can be created? Regards, Ishita On Thu, Nov 29, 2018 at 8:13 AM Nikhil VJ <nikhil...@gmail.com> wrote: > Hi Ishita, > > Just a heads up : Pune is situated 560m above sea level. Floods if any > would be of lesser time and lower scale than what we have seen in Mumbai, > Chennai, Kerala. Also, there aren't Himalayas holding up huge lakes from > glacier melt nearby that can burst at very high pressure like in case of > Kedarnath floods. As far as real estate goes, this difference in elevation > does factor in for folks choosing where between Mumbai and Pune to buy > property. (At least it did for my family) > > It may be important to clarify to the people seeing your visualization > that this is a simulation of a weather event where the water will recede in > some time, not of sea level rise which is permanent. I've seen cases of > mixing the two under the climate change label : Al Gore's latest film also > made that error. Diligence is low when emotions are high. > > Related link: http://flood.firetree.net/ . I found that using this search > query > <https://duckduckgo.com/?q=online+map+flood+simulation&atb=v79-7__&ia=web> > . > > The storm water drain networks (natural and manmade) could be something to > look up in addition to the regular elevation models work which IMHO is more > suited for showing permanent water level rise (which isn't happening for > Pune's case : IPCC predictions too talk about less than 1m rise in a > century : 560m would need us to flood majority of the planet before we get > to Pune. And a downstream dam's height raising would provide for localised > rise as in Narmada valley, but that's not the situation for Pune.) For > temporary flooding, finding choke points in the existing drainage systems > may tell more about which areas will flood and which won't, and this might > have to be done at much more localized level with ground surveys if one > wanted to accurately predict. > > > Sharing an experience from some years ago, this digresses into topics > other than flooding but some folks might find interesting the > inter-connectedness and tradeoffs (as opposed to linear solutions) nature > of real world problem solving: > > ===== begin digression ========= > In 2015 I had attended some citizen-corporation interaction meetings > regarding participatory budget. There one repeating request from citizens > was : Put cement cover over the canals to prevent mosquito breeding. The > govt engineers' answer : Sir/Madam, if we do that then in rainy season your > area and surrounding areas are going to suffer flooding. The problem was : > dumping of garbage into the canals, which was clogging up everything and > spreading filth and disease. So a quick-fix would have been to cover > everything up with cement. But that would severely limit the only flow > route for rainwater and lead to what has been seen in Mumbai, Chennai etc > and even talked about prominently : how cementing up the city caused it. So > this was an example of a tricky problem as my colleagues put it. We also > observed that this dumping was far more prominent in affluent areas where > nobody is at home when the sanitation workers visit in the day and people > do drive-by-tossing of tied up plastic bags in the black of the night. > > And then there were more "solutions" proposed of putting public garbage > bins in the areas so people can toss their stuff there instead of in the > canals, and that led to two simple questions from the municipality > engineers that no one could answer : 1. Who's going to segregate that or > ensure that it's segregated from source? and 2. Who here is ready to allow > a large garbage bin to be placed anywhere near your society? > #cough#property-value#cough# > > I also got to see demands from folks for sanitation workers to come at > their doors at exactly the same convenient time in morning, like 7.30am, > and expecting that to happen at everybody's home simultaneously, as if the > municipality has hired Santa Claus or Naruto to collect the trash. Quite > amusing our educated folks can be. In my area the team rotates their > starting point by the day, so on some days they show up early and some days > you're on the latter end of the collection route. > > ===== end digression ========= > > Afterthought: PMC engineers at ward offices may be able to mark for you > exactly what places can flood if you give them large paper maps of their > wards that have street level and elevation detail. I can help to make those > if needed. > > PS: No formal training in these matters on my end, so apply disclaimers. > > -- > Cheers, > Nikhil VJ > +91-966-583-1250 > Pune, India > http://nikhilvj.co.in > > > On Thu, Nov 29, 2018 at 6:44 AM Naveen Francis <navee...@gmail.com> wrote: > >> Hello Ishita, >> >> Please try out http://inasafe.org/ >> It is pluggin for QGIS. >> >> Thanks, >> naveenpf >> >> >> On Monday, 26 November 2018 23:33:53 UTC+5:30, ishita.g...@gmail.com >> wrote: >>> >>> Hello, >>> >>> I am conducting a talk on climate change, and want to convey through >>> data what would be the impact on Pune in the event of a flood. >>> Specifically, given any particular property of Pune, such as a school, a >>> residential complex etc., I want to be able to quanitfy the risk of this >>> property getting inundated in case of a flood. >>> >>> Kindly guide me on what datasets to use, and some pointers on how to >>> build such a visualization. I am new to GIS and have never done any >>> visualization using public Indian datasets before, so please bear with me >>> if I am asking a preliminary question. >>> >>> Regards, >>> Ishita >>> >> -- >> Datameet is a community of Data Science enthusiasts in India. Know more >> about us by visiting http://datameet.org >> --- >> You received this message because you are subscribed to the Google Groups >> "datameet" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to datameet+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/d/optout. >> > -- > Datameet is a community of Data Science enthusiasts in India. Know more > about us by visiting http://datameet.org > --- > You received this message because you are subscribed to a topic in the > Google Groups "datameet" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/datameet/SwSqkS0oZnk/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > datameet+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- Datameet is a community of Data Science enthusiasts in India. Know more about us by visiting http://datameet.org --- You received this message because you are subscribed to the Google Groups "datameet" group. To unsubscribe from this group and stop receiving emails from it, send an email to datameet+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
