Both the Indian as well as American practices of design of hydraulic jump type horizontal cisterns for energy dissipation below weirs and barrages are examined. The length of the cistern according to Indian practice is based on the height of jump while American designs correlate it with downstream depth of flow. Using experimental data a relation between length and height of jump is first established and on its basis the length of cistern according to the Indian practice in terms of downstream depth is obtained. The length and depth of the cistern according to various American and Indian practices are then compared and scope for economy in Indian practice indicated.
