As the Hohokam expanded their network

As the Hohokam expanded their network, they had to contend with the area's complex topography. Multiple mountain ranges tower around and through metro Phoenix, making it, to my mind, the best big city in the world for hiking. But it's a challenge for hydraulic engineers, especially since epic summer monsoons dump rain that rushes along rock-hard surfaces. Floods would have regularly broken through headgates and filled channels with sediment, which meant the Hohokam constantly repaired, cleaned and diverted the canals. This necessitated a highly coordinated society.