Laserfiche WebLink
SPECIFICATION - 391 - 3 <br />Plant types and species shall be selected based on their compatibility in growth rates, wetness <br />tolerance, and shade tolerance. Table 6, Colorado Plant Materials Technical Note #59, Plant <br />Suitability and Seeding Rates for Conservation Plantings in Colorado, lists trees and shrubs that are <br />common to riparian areas in Colorado and includes various attributes of each species as well as <br />MLRAs where species are suited. Additional information on typical riparian area species composition <br />may be found in the Colorado Natural Heritage Program's Field Guide to the Wetland and Riparian <br />Plant Associations of Colorado. <br />Plants tolerant of dormant <br />seasan water table but <br />axle to withstand site's <br />moisture deficit during the <br />growing season <br />Plants tolerate or <br />depend on prowing <br />season moisture <br />Edge of <br />Active <br />Channel <br />Growtn Season lormant Season <br />Water 1able Water Table <br />Figure 1. Plant adaptation to soil moisture. <br />PRACTICE INSTALLATION <br />Follow 612, Tree/Shrub Establishment Standard and Specification for practice installation <br />specifications. Following shrub/tree planting, tree guards may need to be used to protect woody <br />species from rodents and herbivores. Hardware cloth may be used to protect woody species from <br />beaver damage. <br />Necessary site preparation and planting for establishing new buffers shall be done at a time and <br />manner to ensure survival and growth of selected species. For sites to be tilled, leave a 3-foot <br />untreated strip at the edge of the bank or shoreline. <br />Either hand or machine planting techniques may be used. The method chosen must be capable of <br />achieving proper depths and placement of planting stock roots, and not impair the intended purpose <br />and function of the buffer. <br />Where a herbaceous understory must be established, refer to practice standard 512, Pasture and Ha <br />Planting, or 550, Range Seeding for guidance. <br />Additional RepuirementsTo Reduce Excess Amounts of Sediment, Orcianic Material. Nutrients <br />and Pesticides in Surface Runoff and Reduce Excess Nutrients and Other Chemicals in <br />Shallow Ground Water Flow <br />An additional strip or area of land, Zone 2, will begin at the edge and up gradient of Zone 1 and extend <br />a minimum distance of 20 feet, measured horizontally on a line perpendicular to the water body. The <br />minimum combined width of Zones 1 and 2 will be 100 feet or 30 percent of the active geomorphic <br />flood plain, whichever is less, but not less than 35 feet. (Note: The geomorphic flood plain may be <br />NRCS, CO <br />AUGUST, 2006