150 0 Waterless Urinal (Female) 0 0.0 150 0 Total Daily Volume (gal) 495 Annual Work Days 260 Annual Volume (gal) 128,700 Rainwater or Graywater Reuse Volume (gal> (36,000) Total Annual Volume (gal> 92,70D First, the design case is considered to determine annual potable water usage for sewage conveyan