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Nitrate Loading Calculations (continued) <br />Notes: <br />1. Ave Monthly precip. for Liden, Western Regional Climate Center <br />2. Estimated Average monthly runoff volume; zero assumed for this site with full on-site retention of rainfall level site. <br />3. "Available precip" equal to ave.monthly runoff volume precip minus estimed runoff volume. <br />4. Referenced Eto obtained from CIMIS Zone 12, Eastside Sacramento -San Joaquin Valley; Represents Value for lawns and other uniform turf areas. <br />5. Actual ET adjustment based on the site specific landscape/plant cover (fractional multiplier); see below for calculating "composite factor", 0.83 for this site. <br />6. Net rainfall recharge (" deep percolation") equal to Availbale precip (3) minus Actual ET (5); Negative values set to zero. <br />Calculation of Composite of ETO Adjustment Factor for Hypothetical Residential Lot <br />a. Key reference: University of Cali. Division of Agriculture and Natural Resources: Estimating Landscape Water Requirements (Table 1) <br />b.Site Development Conditions: <br />Land Condition Fractiona Plant product <br />I Total Factor" <br />Impervious Area <br />0 <br />0.1 <br />0.10 <br />tees, Shrubs Groundcovers <br />0.05 <br />0.5 <br />0.03 <br />Lawn (Cool Season) <br />0.9 <br />0.8 <br />0.72 <br />Herbaciuos Perrenials <br />0.05 <br />0.5 <br />0.03 <br />Composite <br />1 <br />1.01 <br />0.87 <br />categories for impervious area assume <br />nominal 0.05 to 0.10 to account for <br />evotranspiration of rainfall retained on paved <br />Table 1. Plant Factors (PF) for established landscape plants, turfgrasses, <br />and garden crops to provide acceptable performance in California'. <br />Plant Type <br />Plant Factor <br />Tree; Slnubs, Vines, Groundcovers <br />(woods plants! <br />Herbaceous Perennials <br />0 5 <br />Desert Adapted Plants <br />0.3 <br />Annual Flowers & Bedding Plants <br />0.8 <br />General Wgrass Lawns, cool -season (tall <br />fescue, Ky. bluegrass, rye, bent) <br />0.813 <br />General Tudgrass Lawns, warm -season <br />(bmmuda, zoysia, St, Augustine, buffalo) <br />0.6 z a <br />Home Frit Crops, Deciduous <br />0.8 2 <br />Home frit Crops, Evergreen <br />1.0 <br />Home Vegetable Crops <br />1.01 <br />Mixed Plantings <br />FOfthepldatmg sMat OfMvpla 4w <br />tserd ii618e ho)lust PF <br />