(1)All landowners or operators conducting activities on lands described above in OAR 603-095-1420 (Geographic and Programmatic Scope)(2) shall be in compliance with the following rules. A landowner shall be responsible for only those conditions caused by the activities of the landowner or operator. Rules do not apply to conditions resulting from unusual weather events or other exceptional circumstances that could not have been reasonably anticipated. Limited duration activities may be exempt from these conditions subject to approval by the department.
(2)Excessive Soil Erosion
(a)There shall be no visible evidence of erosion resulting from agricultural management in a location where erosion has contributed or will contribute sediment to waters of the state. Visible evidence of erosion may consist of the following features:
(A)Sheet wash, noted by visible pedestalling, surface undulations, and/or flute marks on bare or sparsely-vegetated ground;
(B)Visibly active gullies, as defined by OAR 603-095-0010 (Definitions)(1);
(C)Multiple rills, which have the form of gullies, but are smaller, in cross-sectional area, than one square foot.
(3)Riparian Vegetation Destruction
(a)Agricultural management of riparian areas shall not impede the development and maintenance of adequate riparian vegetation to control water pollution, provide stream channel stability, moderate solar heating, and filter nutrients and sediment from runoff.
(b)This condition is not intended to prohibit riparian grazing where it can be done while managing for riparian vegetation required in OAR 603-095-1440 (Prohibited Conditions)(3)(a).
(c)Constructed ditches that carry only irrigation delivery and drainage water are exempt from conditions described in OAR 603-095-1440 (Prohibited Conditions)(3).
(4)Surface Irrigation Return Flows Runoff of surface irrigation that enters waters of the state shall not exceed water quality standards or cause pollution of the receiving water.
(5)Waste No person subject to these rules shall violate any provision of ORS 468B.025 (Prohibited activities) or 468B.050 (Water quality permit).
Rule 603-095-1440 — Prohibited Conditions,