⛰️↘️🚇💧⛲

#qanat #karez #falaj #gravity flow #water channel #aqueduct outlet #water source #underground hydrology

💧〰️⬇️

#slow drip #leak path #gravity flow #water movement #dripping slowly #gradual flow

⛰️➡️🏘️⬇️

#origin high #source above #gravity flow #upstream down #mountain to valley #high to low