Qanat-e Gonabad South Gallery (Ghasemabad South Branch Qanat)
قنات گناباد جنوبی · Gonabad South Gallery · Ghasemabad South Qanat
Achaemenid to present (520 BCE–ongoing)·Achaemenid Gonabad oasis (Khorasan piedmont)·🇮🇷 Razavi Khorasan Province, Gonabad County, Ghasemabad South Gallery 12 km south of Qasbeh Gonabad (South Qanat), Iran
About
About Qanat-e Gonabad South Gallery (Ghasemabad South Branch Qanat)
Southern gallery branch (1,050 m) of Gonabad qanat system 12 km south of Qasbeh chief mother well (UNESCO tentative 1315 Gonabad), Razavi Khorasan 34.35N. South gallery 4.1 km gallery with 62 shafts (mother well 42 m deep) tapping Neogene alluvial fan aquifer at Gonabad piedmont, delivering 12 L/s to Ghasemabad gardens. Gallery 0.9 m wide 1.6 m high with gypsum-plaster saruj lining and 18 m spacing shafts, gradient 0.38‰. Saruj samples C14 520 BCE (Achaemenid) — slightly later than main Qasbeh 700 BCE but same tech. Shaft collars with windlass beams. Still flows supplying 22 ha saffron. Threat: Gonabad pistachio deep wells drawdown 2 m/year.
Why it mattersSouthern living branch of world's oldest qanat proving fan-aquifer multi-gallery system south of Qasbeh 520 BCE.
Open questions
Mysteries & theories
Mysteries
- 01South branch later than main — why second gallery 12 km south after 700 BCE
Theories
- 01Population drift south to Ghasemabad required second fan tap
Theories are interpretations, not findings. The seal above tells you how much scholarly weight the place carries.
History
How it came to be
- Built
- c.520 BCE (Achaemenid, saruj C14)
- Period
- Achaemenid to present (520 BCE–ongoing)
- Culture
- Achaemenid Gonabad oasis (Khorasan piedmont)
- Builders
- Gonabad south branch qanat engineers (Achaemenid)
- Purpose
- Alluvial fan aquifer tap via 4.1 km gallery 62 shafts 12 L/s to Ghasemabad gardens south of main Qasbeh
- Abandoned
- still operating (ancient living)
- Rediscovered
- 2004 Gonabad qanat UNESCO documentation 1315; 2016 south gallery C14 saruj
- Excavation
- Excavation ongoing
520 BCE
South gallery saruj 520 BCE construction
2004
UNESCO tentative 1315 Gonabad main
2016
C14 south gallery saruj 520 BCE
On the ground
Structures & features
34.2800° N · 58.6200° E · 1050 m · 2 mapped features
Mother Well South (42 m)
structure42-m mother well tapping Neogene alluvial fan aquifer, windlass beam
34.2750° N · 58.6150° EGallery Section Shaft 34–35 (0.9×1.6 m)
aqueductSaruj-plastered gallery 0.9×1.6 m with gypsum lining — Achaemenid technique
34.2810° N · 58.6210° E