What is rill and gully erosion?

What is rill and gully erosion?

Rill erosion occurs when runoff water forms small channels as it concentrates down a slope. These rills can be up to 0.3m deep. If they become any deeper than 0.3m they are referred to as gully erosion.

What is a rain water gully?

Drainage gullies – also referred to as gully traps – are ground-level drains that rainwater or grey waste discharge into. Drainage gullies are designed to allow waste and stormwater to pass through easily but stop bad odours and rodents from escaping from out of the drains.

What are gullies drainage?

By definition, a gully (in the context of a drainage system) is a drainage fitting with an open top, a definite base and an outlet to one or more sides. Depending on the type of gully, they can be used to connect wastewater outlets or stormwater/rainwater outlets to suitable drains.

How do you stop gully erosion?

Treatment of classical gully erosion involves protect- ing the headcut from further erosion, diverting over- land flows away from the gully, changing land use, grading and filling in the gully, stabilizing with trees and vegetation, or by constructing a small earthen dam to impound water in the gullied area.

What are rills and gullies?

In hillslope geomorphology, a rill is a shallow channel (no more than a few tens of centimetres deep) cut into soil by the erosive action of flowing water. Similar but smaller incised channels are known as microrills; larger incised channels are known as gullies.

What is the difference between rills and gullies?

Rill erosion is caused by slow movement of water along small channels on bare land with less vegetative cover. Gully erosion creates a deep channels that the surface runoff is further enhanced. The water movement is faster, creating a deeper channels.

How do road gullies work?

A highway gully is a drainage pit covered by an open metal grating located on the road edge. It’s purpose is to drain rain water from the highway into the sewerage system. A highway drain is the pipe connecting the highway gully to the surface water sewer. These are sometimes used to drain the highway.

What are field gullies?

A gully by definition is an outside water drain pipe that’s designed to discharge surface water from your garden. This can include rainwater drainage from your guttering and grey wastewater from your washing machine, sinks, bath/shower and dishwasher.

How do you maintain gullies?

  1. Get yourself prepared.
  2. Locating and clearing your gully.
  3. Remove the gully cover.
  4. Check inside the gully.
  5. Use the drain rod.
  6. Rinse the gully with your hose.
  7. Flush the gully with hot water.
  8. Test the gully before resealing.

How do you control gullies?

Strategies for preventing gully erosion include:

  1. maintaining remnant vegetation along drainage lines and eliminating grazing from these areas.
  2. increasing water usage by planting deep-rooted perennial pastures, trees, or an appropriate mixture of both thus maintaining healthy, vigorous levels of vegetation.

How can we prevent gullies?

There are several methods for controlling gully erosion, which can be chosen depending on the materials available. If it is a small gully, vegetation can be planted in strips across the gully to slow the velocity of water, trap silt, and prevent further erosion. Dams can also be constructed using loose boulders.

Can rills turn into gully erosion?

Even though rill erosion is not as extensive a problem as gully erosion, there are situations in which rills can transform into gullies. As you can see, rills that begin at the top of a slope can quickly disintegrate and branch off into their wider gully counterparts.

What is a rainwater downpipe?

A rainwater downpipe is a pipe that is used to direct rainwater away from a building, typically from roof guttering to a drainage system. It is sometimes also referred to as a downspout, drain spout, roof drain pipe or leader.

How do gullies change over time?

Each year the rills slowly increase in number become wider and deeper. Gully erosion is the removal of soil along drainage lines by surface water runoff. When rills increase in size, they become gullies. Once started, gullies will continue to move by headward erosion or by slumping of the side walls.

What is the difference between a rill and an ephemeral Gully?

An ephemeral cropland gully is larger than a rill and smaller than a classic gully. They usually result from the junction of rills that form a dendritic (branching or tree-like) pattern of channels. Ephemeral gullies usually appear on cultivated fields during the planting or growing season, but are temporarily removed by cultivation.