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<br />. <br /> <br />. <br /> <br />of the proposed mitigation area Plans lor the development of a water management or irrigation <br />system for each section are presented separately. Table 6 presents a summary of the acreage of <br />wetland vegetation types within the mitigation area that will be jnfluenced by the proposed water <br />management system. <br /> <br />Responsible Agency: BLM <br />CooperatIng PartIes/Agencies: COE, CDOW, USFWS, EPA <br /> <br />. Table 6. Summary of acreages of wetland vegetation types Influenced by the water management <br /> system on the proposed lower Muddy Creek mitIgation area. <br /> Wetland <br /> Vegetation High Confidence Potential Benefit Potential Beneftl Total P-otentialty <br /> Type Surface Irrigation' Surface IrrigatJorr Subsurface IrrigatioftJ Irrlga1ed" <br />. <br /> NS5sg6TOT. NS $S TOT. NS SS TOT. NS SS TOT. <br /> Wet meadow 45 37 82 15 0 15 36 0 36 96 37 133 <br /> Willow riparian 32 27 59 7 0 7 9 0 9 45 27 7' <br /> Cottonwood riparian 10 9 " 0 0 0 0 0 0 10 9 " <br />. Ephllmltra/ oxbow 0 15 15 4 0 4 3 0 3 7 15 22 <br /> Total 87 88 175 28 0 28 48 0 48 ,., 88 249 <br /> <br />. <br /> <br />lAcfllage InlluonCGd by surface irrigation. <br />'Acreage adjacent to high confidence veas potentially influenced by surface irrigation. <br />3Acreege directly up$tream 01 the channeVirrigation control structure potentially influenood by elevated ground wa1er levels <br />associated with wa1er backed up by the control structure. <br />~Acreage jnfluenced by water management ApproKimalely 141 acre5 will not be influenced by the wa!er management 5)'s1em but <br />will be benefrted by eliminating grazing. <br />'NS ... northern 6eclion of the lower Muddy Creek mitigetion vea <br />6SS = llouthem 5eetion of the lower Muddy Creek mitigation area <br /> <br />. <br /> <br />Northern Section <br /> <br />. <br /> <br />The acreage in this section is comprised of small sections of land ranging from approximately 2 to 27 <br />acres in size which occur on alternate sides of the creek. A pressurized PVC pipeline irrigation system <br />consisting of two pipelines will be the primary means for irrigating this section of the mitigation area <br />Additional subirrigation in this section will be associated with water backed up by the channel comrol <br />structure used to divert water imo the irrigation ditch on the southern section of the mitigation area <br />Details associated with the pipeline irrigatjon system and channel control structure are presented <br />below. <br /> <br />I <br /> <br />Pressurized PVC Pipeline System. This system consists of two pressurized PVC pipelines originating <br />from a gauged control structure at the base of the proposed dam and running generally parallel to <br />Muddy Creek on both the east and west sides of the mitigation area (Map 1). The pipeline will be <br />buried in a trench approximately 3 feet deep. Gated outlets will be installed approximately every 250 <br />feet and will distribute the water through laterals to areas targeted for irrigation (Figure 3). Each lateral <br />will bubble water into a gravel basin, creating a spring-like effect, from which waler will flow down into <br />the wetland areas. Construction of small contour trenches or other types of lateral ditches may be <br />necessary in certain locations to spread water evenly. Details associated with this component are as <br />follows: <br /> <br />. <br /> <br />12 <br /> <br />. <br />