how can humans assist in the increase of rainfall?
916190
by creating a mixture of certain chemicals and just fire them into the sky
731168
just measure how much water they lose to the atmosophere some how and keep track of the amount of water you have added over a period of time. \nThis should be an interseting experiment.
232693
I would add sand, its cheap and packs and would help if in an area that gets a lot of rain
495305
need to plant rainwater first
833001
The weather is more tropical, humid, and filled with moisture, as well as being warmer.
901588
try this\n\nhttp://www.metoffice.com/education/secondary/students/observing_rainfall.html
1062646
Rain, rain, don't go away.\nLet's catch some drops and save some water.
181295
Rainforests sure get a lot...hence their name!\nAlso, amazingly, deserts get a lot of flash floods!\nHope I helped
630328
A lot of Science and Maths goes behind such predictions. Data collected from satellites, weather balloons, planes and land based instruments is analysed for numerical patterns. These patterns are then processed and compared with findings of a particular time span when a certain amount of known rainfall occurred. In the end a forecast is issued.\n\nNowadays, the job is done by Super Computers but there still remains a large room for errors.
1083463
Why not have enough for both? Why not make both? Instead of using money on stupid sh*t (you can think of a lot of things are money is going to waste on), we can make more swamps to control floodings, and it will also help out our eco system.
720934
The Earth is in danger of becoming almost totally inhospitable for most higher life forms.  Unless we start being more intelligent and get population and resource management under control, the Earth will do if for us.
785900
There are currently NGO's  doing just that. The problem in the developing nations is the corruption in all areas of government. As volunteers or paid employee's the task can become daunting as technology introduced into these villages that seems antique by our standards is modern to them. Teaching modern farming techniques like rotating crops and good agriculture management empowers the local farmers and improves yield. It is a time consuming venture and water management pratices are very important when well water is the only source. You have a good idea, work with it and have fun.
242248
Evaporation from the sea. Dig shallow pools and with bis leaves collect the moist. You can also get salt this way. Also collect the water from the rain.
120972
The water in this planet can support all of it inhabitant but places like desert have difficulties in getting enough water. We need water because we use water as a medium to cool down.
21635
Meteorologists now use doppler radar to better define weather systems, especially rain clouds.  Theoretically this should permit more accurate seeding of clouds with silver iodide (from planes or the ground) to produce rain needed for crops.  At one time hurricanes were seeded with some success; but think of the lawsuits if they steered one your way and you lost your house!!!
373459
The rain drops because of gravity.
242336
Geographical structures that allow the coursing of rivers, wind  barriers, and for the meeting of hot and cold air to form rainclouds that assist in the cycle of precipitation.