Laserfiche WebLink
Nitrate Loading Calculations (continued) <br />Notes: <br />1. Ave Monthly precip. for Linden rain gauge <br />2. Estimated Average monthly runoff volume; zero assumed for this site with full on-site retention <br />3. "Available precip" equal to ave.monthly runoff volume precip minus estimed runoff volume. <br />4. Referenced potentional ETO obtained from CIMIS Zone 12, Linden rain gauge data <br />5. Actual ET adjustment based on the site specific landscape/plant cover (fractional multiplier); see <br />below for calculating "composite factor", 0.41 for this site. <br />6. Net rainfall recharge (" deep percolation") equal to Availbale precip (3) minus Actual ET (5); Negative <br />values set to zero. <br />Calculation of Composite of ETO Adjustment Factor <br />a. Key reference: University of Cali. Division of Agriculture and Natural Resources: Estimating Landscape <br />Water Requirements (Table 1) <br />b.Site Development Conditions: <br />Land Condition <br />Fractional <br />Total <br />Plant <br />Factor* <br />Product <br />Impervious Area <br />0.3 <br />0.1 <br />0.03 <br />Trees, Shrubs Groundcovers <br />0.5 <br />0.5 <br />0.25 <br />Lawn (Cool Season) <br />0.1 <br />0.8 <br />0.08 <br />Herbaciuos Perrenials <br />0.1 <br />0.5 <br />0.05 <br />Composite <br />1 <br />0.41 <br />*Per Table lfor applicable landscape categories, for impervious area <br />assume nominal 0.05 to 0.10 to account for evotranspiration of rainfall <br />retained on paved surfaces, gutters, etc. <br />Table 1. Plant Factors (PF) for establisbed landscape plants, turf9rasses, <br />and garden crops to provide acceptable performance in California'. <br />Plant Type <br />Plant Factor <br />Tree, Shrubs, Vines, Groundcovers <br />(woody plants) <br />0.5 <br />Herbaceous Perennials <br />0.5 <br />Desert Adapted Plants <br />0.3 <br />Annual Flowers & Bedding Plants <br />0.8 <br />General Turforass Lawns, cool -season (tall <br />fescue, Ky. bluegrass, rye, bent) <br />0 8 2.3 <br />General Turfgrass Lawns, wane -season <br />(bermuda, zoysia, St, Augustine, buffalo) <br />0.6 a, 3 <br />Home Fruit Crops, Deciduous <br />0.8 2 <br />Home Fruit Crops, Evergreen <br />1.0 <br />Home Vegetable Crops <br />1.o2 <br />Mixed Plantings <br />Fojthe planting fs thatofthe plant type <br />resent udth the highest PF <br />1 Values do not apply to any plant production operations, such as nurseries, greenhouses, <br />sod farms, or commercial farms. <br />z Plant Factor shown is the annual average Kc value; monthly or seasonal Kc's may be available <br />if more precision is desired. <br />3 Plant Factor does not apply to sports fields, golf greens or tees. <br />4 From UC reference; note plant factors are annual average values; additional refinement may <br />be needed for seasonal crops. <br />