If you are in doubt, please seek the advice of a professional irrigation designer or engineer.
The design step is not compulsory and can be skipped if desired. HOWEVER this is not recommended unless you have a specific task where only a copy of the surveyed data is required.
## **Design capabilities present in different T3RRA software packages** The ‘**Create design**’ page is presented to you when you advance to the ‘**Design**’ wizard step. The tools you will see differ based on the specific T3RRA software you are using. This is because each package is aimed at a certain user type and market segment. A surfaced elevation map is the starting point for creating a new field design. Determining an optimal terrain design is very specific to the conditions that exist on an individual farm. Cropping practices, existing topography, soil types, costs, available machinery, and many other factors apply. Even if you are not intending to do full field land forming (such as is the case when only creating ditches) we still see great value in fully surveying a field. All of our packages allow you the capability of doing this. All of our design tools show you the surface in 3D and can run a rainfall simulation on it. In general, the design aims of each package are explained over the next few pages: T3RRA Cutta provides tools for GPS based land-forming, ditching, and levee creation.  In order to provide solutions that are as broadly applicable as possible T3RRA Cutta includes a variety of design methods:NOTE: A powerful capability of T3RRA Cutta is the ability to “chain” designs together. As well as performing designs on the original field surface, you can also perform designs on an existing design. For instance, after performing a multi-fit design, you can then go and use the '**Smoothing**' tool to smooth the multi-fit design. Use this capability methodically and with care - it is easy to get confused!
T3RRA Ditch provides tools for ditching and levee work  - Drain profile and cross section design - Automated drain path creation - Pattern drain design - Levees (including regions) - Manual drain design T3RRA Plane provides tools for laser based levelling and ditches  T3RRA Plane can’t do non-linear surface designs. But we wanted to make sure that it can do anything you can do with a laser level.