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July 1993 -14- 923-2515 • <br />Native Rangeland and Dryland Agricultural Areas: Native rangelands and dryland <br />agricultural azeas were identified and mapped using aerial photography and by field <br />reconnaissance. <br />Potential Flood Irrigation Areas: Potential flood irrigation areas were determined by first <br />identifying those landscapes in alluvial areas along streams that: (1) have soils that aze <br />productive and potentially irrigable; (2) have surface water of sufficient volume and quality to <br />grow agricultural crops; (3) have a landscape and an acreage appropriate for farming, <br />considering regional agricultural practices and economics; and (4) are easily accessible to farm <br />machinery. <br />Data on the irrigability of sails was acquired from SCS (1991) mapping and conversations with <br />SCS personnel (Moore 1992). Data collected by Peabody from surface water monitoring sites • <br />was used to evaluate quantity and quality of water for irrigation. Data on the minimum acreage <br />suitable for irrigation was provided by the Colorado Division of Minerals and Geology (CDMG) <br />(Routen 1992) and the ASCS (Heath 1992). Accessibility was determined through field <br />observations, USGS maps, and color aerial photography. <br />4.2 Description of Aericultural and Non-Aericultural Fields <br />Information on current crops and annual yield for agricultural fields was obtained from <br />landowners and ASCS data. The native vegetation of subirrigated areas and wetlands was <br />described from qualitative field observations. Native rangelands were described from qualitative <br />field observations and SCS range site data. <br />4.3 Alluvial Valley Floor Definition <br />This study used the Alluvial Valley Floor (AVF) definition from the Regulations of the Colorado • <br />Mined Land Reclamation Board for Coal Mining as revised by the Colorado Mined Land <br />Golder Associates <br />