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Effect of Travel Time on Management of a Sequential Reuse Drainage Operation

Dep. of Environmental Sci., Univ. of California, Riverside, CA 92521

View larger version (18K): [in a new window]   Fig. 1. Water flow streamlines through the saturated zone of a tile line with = S/D = 1, where S is half the distance between drains and D is the height of the tile above an impermeable barrier. The symbols x and z refer to horizontal and vertical directions, respectively.

View larger version (19K): [in a new window]   Fig. 2. Cumulative travel time probability density functions (CDFs) as a function of dimensionless time T = Rt/SS calculated for various ratios = S/D, where R is drainage rate, S is saturated water content, S is half the distance between drains, and D is the height of the tile above an impermeable barrier.

View larger version (13K): [in a new window]   Fig. 3. Response time and equilibration time of the first stage of a system overlying a shallow (3-m) and deep (60-m) barrier, using parameters from the Red Rock Ranch in Table 1.

View larger version (18K): [in a new window]   Fig. 4. Drain concentrations from all four stages of a system overlying a shallow (3-m) barrier, using parameters from the Red Rock Ranch in Table 1. Dashed lines represent steady state concentrations.

View larger version (18K): [in a new window]   Fig. 5. Drain concentrations from all four stages of a system overlying a deep (60-m) barrier, using parameters from the Red Rock Ranch in Table 1. Dashed lines represent steady state concentrations.

View larger version (14K): [in a new window]   Fig. 6. Percentage dilution required to maintain the irrigation water of Stage 2 of a system overlying a shallow (3-m) and deep (60-m) barrier at 5 dS m-1 or less, using parameters from the Red Rock Ranch in Table 1. The predicted dilution using the steady state model is zero.