Table 16-6. WORK, REST, AND WATER CONSUMPTION TABLE HEAT CATEGORY WBGT INDEX, IN DEGREES FAHRENHEIT EASY WORK MODERATE WORK HARD WORK WORK/ REST WATER INTAKE (QT/ H) WORK/ REST WATER INTAKE (QT/ H) WORK/ REST WATER INTAKE (QT/ H) 1 78 to 81.9 NL 0.50 NL 0.75 40/ 20 0.75 2 (GREEN) 82 to 84.9 NL 0.50 50/ 10 0.75 30/ 30 1.00 3 (YELLOW) 95 to 87.9 NL 0.75 40/ 20 0.75 30/ 30 1.00 4 (RED) 88 to 89.9 NL 0.75 30/ 30 0.75 20/ 40 1.00 5 (BLACK) 90 or more 50/ 10 min 1.00 20/ 40 1.00 10/ 50 1.00