Laserfiche WebLink
Section 785.19 (c) Continued. <br />• (v) Documentation, based on representative sampling, that areas identi- <br />fied under this paragraph are, or are not, flood irrigable, based on <br />stream-flow, water quality, water yield, soils measurements, and topo- <br />graphic characteristics. <br />(vi) Analysis of a series of aerial photographs, including color <br />infrared imagery flown at the time of year to show any late summer and <br />fall differences between upland and valley floor vegetative growth and <br />of a scale adequate for reconnaissance identification of areas that may <br />be alluvial valley floors. <br />(2) Based on the investigations conducted under 30 CFR 785.19 (c)(1), <br />the regulatory authority shall make a determination of the extent of any <br />alluvial valley floors within the study area and whether any stream in <br />the study area may be excluded from further consideration as lying <br />within an alluvial valley floor. The regulatory authority shall deter- <br />. mine that an alluvial valley floor exists if it finds that-- <br />(i) Unconsolidated stream-laid deposits holding streams are present; <br />and, <br />(ii) There is sufficient water to support agricultural activities as <br />evidenced by: <br />(A) The existence of flood irrigation in the area in question or its <br />historical use; <br />(B) The capability of an area to be flood irrigated, based on stream- <br />flow water yield, soils, water quality, and topography; or, <br />(C) Sub irrigation of the lands in question, derived from the ground <br />water system of the valley floor. <br /> <br />785-8 <br />