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• standing or slow-flowing water occurs during much of the growing season, support vegetation that <br />is dominated by phreatophytic and hydrophytic graminoids (carices, rushes, and sedges). 3) The <br />least well-drained areas, or areas where standing water persists, are dominated exclusively by <br />thick stands of cattail (Typha latifolia also a perennial graminoid). <br />The graminoid-dominated component characterizes the Swale/drainage type because of its <br />greater areal extent (approximately 95 percent of the type) than the other two components and its <br />potential grazing utility. Cattail occurs primarily adjacent to stock ponds and in tailwater drainage <br />ditches. Willow is primarily restricted to the banks of the west lateral CC Ditch. Where significant <br />areas of cattails and willows occur, they form islands or stringers within the graminoid component. <br />Vegetation cover, frequency and herbaceous production samples were concentrated in the <br />graminoid component of the Swale/drainage type primarily because of measurability and the fact <br />that this component comprises the majority of the type. The willow component Chas a closed <br />canopy and measurement of the production of shrubs is not required by CDMG regulations. <br />However, density data in the willow thickets was collected. No data was collected from the cattail <br />component. Both the willow and cattail components function primarily as wildlife habitat (see <br />• Section 2.04.11, Fish and Wildlife Resources Information). The cover and frequency sampling <br />results for the graminoid component are summarized in Table 2.04.10-19. <br />Total vegetation cover was estimated at 59.0 percent (Table 2.04.10-19). The cover of litter and <br />bare ground was 40.8 and 0.2 percent, respectively. Hydrophytic graminoids comprised most of <br />the vegetal cover (41.9 percent total cover) followed by perennial (orbs (3.5 percent total cover), <br />annual forbs (0.2 percent total cover). <br />The mean herbaceous production in the graminoid component of the swaleldrainage type is <br />presented in Table 2.04.10-20. Table 2.04.10-20 expresses production on a dry weight basis by <br />morphological class as grams per 0.25mz (plot size), pounds per acre and percent composition by <br />weight. The results indicate that perennial graminoids dominated the type component in terms of <br />biomass (90.6 percent of the total above-ground plant biomass). Perennial and annual forbs <br />contributed 9.4 percent to total herbaceous production. Total production exceeded that of any <br />vegetation type sampled (8,236 pounds/acre). <br />• (REVISED B/15/00) 2.04.10 - 59 <br />