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WSP04289
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Last modified
1/26/2010 12:54:44 PM
Creation date
10/12/2006 12:15:45 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8543
Description
Closed Basin Division
State
CO
Basin
Rio Grande
Water Division
3
Date
1/1/1979
Title
Fish and Wildlife Mitigation and Enhancement Plan - Closed Basin Division - San Luis Valley Project - Colorado
Water Supply Pro - Doc Type
Report/Study
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<br />~/} <br />~~~ <br />,~ <br />1''00/ <br />:-) <br />,,";:; Wetlands are lands that are transitional between terrestrial and aquatic systems. <br />The water table is usually at or near the surface, or the land is covered by <br />shallow water. For the purposes of the fish and wildlife wetland classification <br />system (L. M. Cowardin et al.), wetlands must have one or more of the following <br />three attributes: (1) at least periodically, the land supports predominantly <br />hydrophytes; (2) the substrate is predominantly undrained hydric soil; and (3) <br />the substrate is nonsoil and is saturated with water or covered by shallow water <br />at some time during the growing season of each year. <br /> <br />II. Projects Impacts <br /> <br />A. Wetlands <br /> <br />To help determine the impacts of the Closed Basin Division, San Luis Valley <br />Project on wetlands, the following information was reviewed: <br /> <br />(a) <br />(b) <br />(c) <br />Cd) <br />(e) <br />Water and <br /> <br />Wetland inventory maps; <br />1978-1980 shallowest and deepest water table maps; <br />U.S. Geological Survey (USGS) predictive water table drawdown maps; <br />Water and Power infiltration test data for 1979-80; and <br />Numerous letters of correspondence and data transmittal between <br />Power and FWS. <br /> <br />The project could have several impacts on wetlands, some of which are quanti- <br />fiable and others not. The more easily identified impacts are related to <br />interruption of natural overland flow by the construction of the conveyance <br />channel and direct effects of pumping. <br /> <br />The channel is not expected to change local natural overland flows in stage 1-2 <br />of the project area since overland flows due to snowmelt runoff or irrigation <br />returns are very rare there. Stage 1-2 wetlands are generally replenished by <br />direct precipitation. In stages 3, 4, and 5, the affected area was taken to be <br />all wetlands within 1,000 feet of the channel and which were located to the <br />south-southwest of the channel. Direction of flow is important since overland <br />flows in stages 3-5 generally come from the north-northeast' direction. The <br />wetlands adversely affected by conveyance channel construction were determined to <br />be 4,946 acres. <br /> <br />The road construction adjacent to the wetlands was estimated to affect about <br />80 acres, based on a 20-foot road width. Only direct displacement of wetland <br />acreage was considered here. The total acreage of wetlands adversely affected <br />by conveyance channel and road construction is therefore 5,026 acres. Approxi- <br />mately 25 acres of the 5,026 acres of wetlands affected by conveyance channel <br />construction occur on the Blanca wildlife Habitat Area (WHA). <br /> <br />The acreage of wetlands in the project area that could be potentially impacted <br />by project pumping was also determined. These wetlands were determined using <br />the 1978-1980 water table maps as having ground water within 2-1/2 feet of the <br /> <br />7 <br />
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