Gravity and pressure move water downward and sideways underground through spaces between rocks. This type of load can result from mineral alteration from chemical erosion, or may even be the result of groundwater seepage into the stream.

The water that is in a state of downward movement in the gravity is known as percolating water. It moves vertically through the soil and rocks, driven by the force of gravity. The stream load that comes from groundwater seepage is called dissolved load. It consists of ions that are in solution within the water, such as dissolved minerals or salts.

Dr Chandrasekhar Reddy Kamasani thank you for your contribution to the discussion

Stream load is composed of dissolved or solution load, suspended load, and bed load. The dissolved load comes primarily from groundwater seepage into the stream. Ions in solution also come from the solution of materials that line the channel. The majority of a stream's sediment load is carried in solution or in suspension. The remainder is the bed load. Earth material that has been dissolved into ions and carried in solution is the dissolved load. Flowing streams pick up and transport weathered materials by eroding sediments from their banks. Streams also carry ions and ionic compounds that dissolve easily in the water. Sediments are carried as the following loads: dissolved, suspended, and bed. A dissolved load is composed of ions in solution. The suspended load is the fine‐grained sediment that remains in the water during transportation. As flooding river is muddy and discolored from the large amounts of sediment suspended in the water. Gravity and pressure move water downward and sideways underground through spaces between rocks.