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Normal and critical depth 101. Normal depth in a prismatic channel using the Manning equation 102. Critical depth in a prismatic channel 103. Discharge in a partially full circular culvert 104. Critical slope in a prismatic channel 105. Normal and critical depth in a prismatic channel 106. Normal depth in a partially full circular culvert 107. Critical depth in a circular culvert or pipe 108. Normal depth in a prismatic channel using the Chezy equation 109. Normal depth in a roadside ditch using the Manning equation... 115A. Discharge in a prismatic channel using the Manning equation, with two side slopes