NR 120.14(4)(a)(a) Description. Field diversions are structures installed to divert excess water to areas where it can be used, transported or discharged without causing excessive erosion or contacting materials with water pollution potential. Usually the system is a channel with a supporting ridge on the lower side constructed across the slope at a suitable grade with a self-discharging and non-erosive gradient. This practice shall be implemented using one or more of the standards in par. (c). NR 120.14(4)(b)1.a.a. Diversions and subsurface drains necessary for proper functioning of the diversion. Cost-sharing for subsurface drains is limited to areas on sloping land where the internal water seeps to the surface and causes the land or cover to lose its stability. NR 120.14(4)(b)1.b.b. Installations of structures such as pipe, underground outlets or other outlets, if needed, for proper functioning of the dike, for more even flow or to protect outlets from erosion. NR 120.14(4)(b)3.3. Cost-sharing may not be authorized for ditches or dikes designed to impound water for later use, or which will be a part of a regular irrigation system. NR 120.14(4)(c)(c) Standards. Standards are the following from the NRCS field office technical guide: NR 120.14(5)(a)(a) Description. Terraces are a system of ridges and channels constructed on the contour with a non-erosive grade at a suitable spacing. This practice shall be implemented using one or more of the standards in par. (c). NR 120.14(5)(b)1.a.a. Terraces and the necessary grading to permit installation of an effective system consistent with the type of terrace and criteria for use specified in the approved priority watershed plan, priority lake plan or project grant application. NR 120.14(5)(b)1.b.b. Materials and installation of underground pipe outlets and other mechanical outlets necessary for the proper functioning of the terrace.