'Run+Off'+Group

**Run Off task card**
So impressed Adam, I know you have put a lot of work into this, = MuM 2011 - __﻿Run-off__ - Adam, Liam and Brad. =

=Run-off activity card=
 * =Run-off is the rain that is neither absorbed by the ground nor evaporated.=
 * =Run-off can carry with it all the loose materials in the catchment, washing soil, fertilisers and pesticides into the waterways.=

These are a few pictures of which run-off looks like:




=
Run-off is the movement that flows the water into an ocean, river or lake. Surface run-off is the waterflow that occurs when soil is infiltrated to full capacity. Surface run-off causes EROSION of the earth's surface; DEPOSITION is the deposing of erosion. There are four types of erosion: SPLASH erosion, GULLY erosion, SHEET erosion and STREAM BED erosion. ======

=Where does all the water go?=

*and dams.
= What's in the run-off? =

The activities in the two pictures have to do with run-off because, there are two paths for the water to flow through to get to an ocean, river, lake, creek or dam.
= ﻿If rain falls in these two places, what kinds of things would the water pick up as it flows away? =

On a petrol station, water passing by would pick up: food scraps and rappers, rubbish, petrol and more water around and other things that would just go straight into the drain.
=In your local catchment area, what things could be used, spread and dropped?=

Things that might be used, spread and dropped in my local catchment area could be fertilisers, rubbish, food, rocks, cans and some other unusual things.
= ﻿What will happen to those things when the rain falls? =

When the rain falls, the things will get picked up by the water, flow through the catchment and land in a ocean, river or creek and could harm sea-creatures and other things that go in the water.
= ﻿How could Run-off be minimized? =

=
Run-off could be minimised if the ground level stays flat and if people stop littering, because it is harming many innocent things. Also don't ruin the ground like digging for nothing, making holes and paths for water to go through, that would just cause more run-off. ====== =**Internet research - See if you can find out some information about some real-life events caused by excessive run-off:﻿**= We believe some real life events caused by excessive run-off is something like EROSION as it is caused by run-off. Without run-off no water could flow into an ocean, river or lake etc, so less water would run into the sea. =** ﻿Preventing/Minimizing Run-off: **= Planning ahead is the first and most important step in preventing or minimizing erosion due to run-off. An easy way to do this is to pretend that you are a raindrop. In looking at the landscape or any impervious surfaces, which route would you travel to? Obviously, you would want to take the easiest path downhill. Keeping that in mind, note any areas that runoff would choose to travel. Consider slope, soil type, and existing vegetation as you plan your development. =What happens when:= **﻿The rain is light (drizzle)?** - When the rain is light not as much run-off occurs. **When tere is a long period of hevy rain?** - When there is a long period of heavy rain, run-off isn't at its best. I think this because the rain comes down so fast it it runs off fast and doen't go down together.
 * When it is a short storm with heavy rain? - ** When there is a short storm with heavy rain it run-off is at its best. I think this because the heavy rain comes down for a short period of time, so the rain takes a bit longer to be run-off and goes down as a group of rain.