How to Teach Elemantary Children About Floods

Does she have access to small plastic items like legos, farm animals, cars, anything that water would not harm and a clear tub (something you can make a scene in). Make a scene like a house or farm and then take a plant watering can and slowly start pouring the water over it until you have the desired amount of "flooding". I hope this helps in some way or it at least gives her an idea.
Let us know what she does.

She could use a 10 gallon fishtank and build a diorama of a town in the bottom of it. She could add a dam at one end and a river with a town. Add water to the dam, and wehn it breaks, it will flood the river and town. Hope this makes sense and helps.

Since they are elementary students, maybe talk about floods on a small scale (i.e, a flood in the house - what can cause them - how to respond/clean up afterwards - saftey issues) and then on a large scale (i.e, the recent floods in Texas due to the storm). My son is 7 yrs old and he understands about the flooding that happened in Texas. Maybe she can bring in a sand bag to show what they use to assist with the storm flooding. Visuals are always great with elementary age children.

Like all good teachers...google the activity. Type something like:
Teaching floods
or
Lessons plan floods and the age range
You would be amazed at what comes up.

I'm not really good with this stuff, but I was thinking she could use a sand table, a pail of water and some lego houses. She could make the sand into a dam and show what happens when the dam breaks. She could also show what happens when water goes over a seawall, or heavy rains affect the homes. Perhaps a drainage area could lead the water away from the homes into a "lake".

After teaching the principles, she could even ask the class to design a city where torrential rains would not leave the homes flooded (they could put the homes on high ground, or create drainage into a lake or ditches).

I hope that helps!