Add to map places where there is flooding possibility. These places should appear on the map as warning if app receive any alert near of 10 km about climate risk or flooding, and if confirmed by user on app, change the routing as already made.
Support: The flodding areas were reported by some regions like Sao Paulo city(http://noticias.uol.com.br/cotidiano/ultimas-noticias/2013/11/22/sao-paulo-tera-sinalizacao-com-aviso-sobre-locais-de-enchentes-neste-verao.htm) and related on reliable sources like GeoSampa.
This update was also reported by other users but with other ideas (https://waze.uservoice.com/search?filter=ideas&query=alagamento).

Adicionar ao mapa locais onde há possibilidade de alagamento. Esses locais devem aparecer no mapa como aviso em caso de alertas próximos 10 km sobre risco climático ou demais alagamentos, e em caso de confirmação pelo app, alterar o roteamento.
Material suporte: As áreas sujeitas a alagamento foram divulgadas por algumas prefeituras a exemplo de São Paulo (http://noticias.uol.com.br/cotidiano/ultimas-noticias/2013/11/22/sao-paulo-tera-sinalizacao-com-aviso-sobre-locais-de-enchentes-neste-verao.htm) e constam em fontes confiáveis como o GeoSampa.
Essa inclusão é relatada também por outros usuários em conjunto com outras idéias (https://waze.uservoice.com/search?filter=ideas&query=alagamento).

Due to local flooding one of the roads I frequently take is closed. However, even though I mark the closure Waze doesn't "remember" 8 hours later and makes it impossible to plan a route back. The flooded road is near my destination. Waze should be smarter about "opening" flooded roads until there is a regular amount of traffic one them or at least allow me to mark a road along my route as "don't route me here".
Ideally Waze would respect state department of highway road closures, but this would be hard as there is no standard and the sites are often hours out of date.

Agree with need for warnings for ice or flooding on road!

It'd be great to know where there is a flooding problem to avoid.

If users on the road can provide info on deep floods on the road it would be great as Philippines has frequent disaster

Im from Manila and we often have impassable roads due to floods.include floods in your road hazard list.

Hi Im from Manila in the philippines. Please include floods as an option in your Hazard report since we often experience flooded streets!

Also mentioned in http://waze.uservoice.com/forums/59223-client-how-can-we-improve-waze-on-your-phone/suggestions/2549196-new-report-options

Add New Report Options

Hazard -> Wheather -> Flooded street
(Perigo -> Clima -> Rua alagada)

Hazard -> On road -> Broken light
(Perigo -> Em rota -> Semãforo quebrado)

With the arrival if Spring some areas like mine are prone to street flooding or in some cases landslides. We already have the ability to report when a street is closed but I would like to add to it the ability to report street flooding, landslide or sinkhole, or emergency shut down due to authorized vehicles blocking off street for emergency response such as fire and police activity. In light of suck events in Boston with the 9 alarm fire and the bombings to the landslides in California and the street flooding from the Spring thunderstorm. Reporting road conditions in these situations would be very helpful.

Many road by me are flooded due to heavy rain causing traffic and hazardous driving conditions. Even though there is a weather report option, it doesn't specify flooding which would be very helpful

Please consider voting for
http://waze.uservoice.com/forums/59223-client-how-can-we-improve-waze-on-your-phone/suggestions/2549196-new-report-options
It contains this as one of its suggestions, and is in the Top 12.

I agree. We need an option to report a flooded road and ice just like the hazard options :)

So much rain, so many roads flooded. A Flood warning is a much needed hazard warning addition, as to is Ice on the road.

Ice would have been great today and the past few weeks.

Being able to avoid roads that are frozen and would slow down your route would be very helpful in navigating around town, as well as safer!

Add flooding or standing water as a hazard option without typing.

More Hazard options...Tree down, traffic light out, flooding, Ice

And gravel / dirt

This will alert Wazers of impassable roads due to floods. An alert notice will help them find alternate routes for their safety and benefit. This qualifier can be added to either On Road hazard or Weather hazard. Can be both too.