Design the location and the size of the crib intake structure. (i) Calculate the minimum depth or sounding (below water datum) required at the crib location. Use Figures 2 and 3. Assume that the highest water level in the lake is 1.0 m below the (shore) ground level. (ii) Locate crib intake structure on Figure 3 (show location and mark distances for pumping station (PS) and crib intake). (iii) Calculate the crib intake dimensions. (iv) Mark all elevations (with reference to GL) and dimensions of water levels, crib intake, pumping station, suction pipes and forced main on Figure 2. COMMERCIAL PIPE SIZES PRESSURE PIPES SEWERS mm (in) mm (in) 50 (2) 100 (4) 75 (3) 150 (6) 100 (4) 200 (8) 125 (5) 250 (10) 125 (5) 250 (10) 150 (6) 300 (12) 175 (7) 375 (15) 200 (8) 450 (18) 250 (10) 525 (21) 300 (12) 600 (24) 350 (14) 675 (27) 400 (16) 750 (30) 450 (18) 900 (36) 500 (20) 1050 (42) 600 (24) 1300 (48) 750 (30) 1450 (54) 900 (36) 1600 (60) 1050 (42) 1200 (48)