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Section 785.19 (c) Continued. • allow the regulatory authority to make a final determination regarding the existence of an alluvial valley floor, Studies performed during the investigation by the applicant or subsequent studies as required of the applicant by the regulatory authority, shall include an appropriate combination, adapted to site-specific conditions, of-- (i) Mapping of unconsolidated stream-laid deposits holding streams including, but not limited to, geologic maps of unconsolidated deposits, and stream-laid deposits, maps of streams, delineation of surface water- sheds and directions of shallow ground water flows through and into the unconsolidated deposits, topography showing local and regional terrace levels, and topography of terraces, flood plains and channels showing surface drainage patterns. I (ii) Mapping of all lands included in the area in accordance with this paragraph and subject to agricultural activities, showing the area in which different types of agricultural lands, such as flood irrigated lands, pasture lands and undeveloped rangelands, exist, and accompanied by measurements of vegetation in terms of productivity and type. (iii) Mapping of all lands that are currently or were historically flood irrigated, showing the location of each diversion structure, ditch, dam and related reservoir, irrigated land, and topography of those lands. (iv) Documentation that areas identified in this paragraph are, or are not, subirrigated, based on ground water monitoring data, representative water quality, soil moisture measurements, and measurements of rooting depth, soil mottling, and water requirements of vegetation. (v) Documentation, based on representative sampling, that areas identi- fied under this paragraph are, or are not, flood irrigable, based on streamflow, water quality, water yield, soils measurements, and topo- graphic characteristics. 785-4