Q.What Hydrographic data required for Design of bridge?

(i) Design discharge for bridge waterway and foundation with corresponding high flood levels. Frequency curve for annual peak discharges.

(ii) Gauge-discharge or rating curve at bridge site showing rising and falling limbs separately.

(iii) Hydrographs pertaining to normal year and also the one containing peak discharge for foundation design.

(iv) Rating curves should also be observed near the cross section at model boundaries. Alternatively low water and high water slopes should be reported.