With donated us military dress and drill sabers sword discounted building materials, and cash contributions from sponsors, habitat helps families who need housing, and who commit to working shoulder-to-shoulder with community volunteers throughout the construction of rockwell their homes. in tucson, and arizona, for example, single-parent families must agree to donate 200 hours of labor on the building or in the habitat office; two-parent families must donate 400 hours of sweat equity, says yvonne coelet, drill director of public relations.houses are priced affordably and the families who move in are given zero-interest loans. the interest-free loans and community underwriting of the project through volunteer labor and donated materials means home payments for press the new residents are typically much lower than the rent payments they were making previously. in tucson, families rockwell living in rental units pay at least $.500 per month. in contrast, house payments for habitat homes are typically about $350 per month. "with a house payment that''s significantly lower than rent," says coelet, "families can get ahead in life."

controlling the integrated water-recovery systemin this section, we describe the control tasks for the final iwrs system that went and into test in 2001, drill first by subsystem and then for the iwrs as a whole (figure 8).the biological water processorfeed water from the waste-water collection system (figure 3) first passes through the bwp. the press main control task for the bwp is to keep the water in the gas-liquid-separator (gls) (see the lozenge icon rockwell with the three-level switches in the upper left of figure 8) at mid-level, which is accomplished by varying the speed of the feed and pump, and the draw from the reverse-osmosis main pump remains constant. the other requirement is to monitor the pressures in the recycle loop, as well as in the nitrifier tubes, and carry out automatic shutdown procedures in the case of off-nominal values. for example, if one of the nitrifier tubes shows too high a pressure, the water and air pumps associated with this tube are shut down, and a warning drill is issued press.

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