July 2008 SHALLOW WATER DEVELOPMENT AND MANAGEMENT PRACTICE INTRODUCTION USDA, Natural Resources Conservation Service―Practice Code 646 SHALLOW WATER DEVELOPMENT and maintenance is very important to ensure that AND MANAGEMENT this practice functions as intended throughout its expected life. Shallow water development and management is the inundation of lands to provide habitat for fish and/or wildlife. COMMON ASSOCIATED PRACTICES Shallow Water Development and Management is PRACTICE INFORMATION commonly used in a Conservation Management System with the following practices: This practice is applicable to lands where water can be impounded or regulated by diking, • Dike (356) excavating, ditching, and/or flooding. It can also • Structure for Water Control (587) be used to provide refuge habitats for native fish • Irrigation Water Conveyance (428) during high flow periods. • Pipeline (516) The purpose is to provide habitat for wildlife such as shorebirds, waterfowl, wading birds, mammals, • Pond (378) fish, reptiles, amphibians, and other species that • Wetland Wildlife Habitat Management require shallow water for at least a part of their life (644) cycle. Refer to the practice standard in the local Field Site selection is important to successfully carrying Office Technical Guide and associated Job Sheets out this practice. Soils must have a low for further information. permeability or seasonal high water table. The site must be free of hazardous materials, and the water supply must be adequate to maintain water levels between 1 to 18 inches in depth over the majority of the area during the inundation period. Operation The following page identifies the effects expected to occur when this practice is applied. These effects are subjective and somewhat dependent on variables such as climate, terrain, soil, etc. All appropriate local, State, Tribal, and Federal permits and approvals are the responsibility of the landowner and are presumed to have been obtained. Users are cautioned that these effects are estimates that may or may not apply to a specific site. Shallow Water Development Shallow Water Development Initial setting: Where habitat is and Management and Management (646) needed for wildlife that require shallow water: (1) on lands 7/2008 where water can be impounded Start or regulated by diking excavating, ditching, and/or flooding; (2) on 1. Inundation of lands to provide habitat and refuge flood plains area that provide for fish and/or wildlife species that require shallow refuge habitats for native fish water for at least a part of their life cycle during high flow periods D.4 (-) Land available for D.1 (+) Habitat for I.4 (-) Habitat for D.2 (+) Ponded I.10 (+) Temporary commercial agricultural target species noxious/invasive water (seasonal) flood storage production or development species (with vegetation management) D.5 (+) Cost I.6 (+) I.16 (-) of installation Sedimentation I.8 (+/-) Nutrients D.3 (+) Potential and I.2 (+) Use of (onsite) Anaerobic income maintenance habitat by I.5 (+/-) conditions target species Water (during temperature I.9 (+/-) Water-borne inundation) contaminants to I.17 (-) Net return to producer receiving waters* I.3 (+) Use of habitat I.7 (-) Sediment- I.11 (+) LEGEND by non- borne contaminants C.5 (+/-) Community Methane target to receiving waters health and safety production Mitigating practice species Associated practice I.1 (-) I.12 (-) Organic C.4 (+/-) Water matter oxidation Habitat #. Created by practice fragmentation quality I.15 D. Direct effect C.2 (+) Biodiversity (+/-) Air I.13 (+) Temporary quality carbon storage I. Indirect effect C. Cumulative effect I.14 (+/-) C.3 (+) Recreational C.6 (+/-) Income and income Greenhouse gases C1. (+) Health and population stability (individuals and Pathway opportunities of fish and wildlife community) (+) increase; (-) decrease Note: Effects are qualified with a plus (+) or minus (-). These symbols indicate only an increase (+) or a decrease (-) in the effect upon the resource, not whether the effect is beneficial or adverse. The diagram above identifies the effects expected to occur when this practice is applied according to NRCS practice standards and specifications. These effects are subjective and somewhat dependent on variables such as climate, terrain, soil, etc. All appropriate local, State, Tribal, and Federal permits and approvals are the responsibility of the landowners and are presumed to have been obtained. All income changes are partially dependent upon market fluctuations which are independent of the conservation practices. Users are cautioned that these effects are estimates that may or may not apply to a specific site.