Until 1879, when irrigation diversions prevented it, Fresno Slough was also an outlet of the overflow waters of Tulare Lake into the San Joaquin River in flood years, when its level topped the 210 foot elevation.
22.
Troops positioned outside the walls wouldn't have reached any of it, because even the overflow water released from the Pool of Siloam would have fully disappeared into a karstic system located right outside the southern tip of the city walls.
