Nimrud Dam
Kalhu Dam · Tigris Regulator at Nimrud
Neo-Assyrian Empire 879-612 BCE·Assyrian Neo-Assyrian imperial engineers·🇮🇶 Nineveh Governorate, Nimrud (Kalhu) plain, Iraq
About
About Nimrud Dam
Assyrian Tigris regulator dam at Nimrud (Kalhu), the Neo-Assyrian capital's hydraulic node: 3-m high, 200-m long stone weir with 5 sluice bays diverting Tigris flood into the 43-km Sennacherib-Jerwan canal cascade feeding Nineveh. 697 BCE for Nineveh's expansion. The dam's sluice gates are the earliest known Tigris hydraulic regulator, and the weir impoundment created the marshy buffer that protected Kalhu's east wall. Unlike Sadd el-Kafara's ungated embankment, Nimrud's gated weir allowed perennial regulation.
The underlying Nimrud tell holds palace reliefs depicting the dam's construction including sappers with stone-moving depiction.
Why it mattersEarliest known Tigris gated regulator and node of Neo-Assyrian hydraulic cascade linking Kalhu to Jerwan aqueduct.
Open questions
Mysteries & theories
Mysteries
- 01Weir vs Nimrud palace foundation chronology - reused prism
Theories
- 01Nimrud-Nineveh cascade as first river basin hydraulic empire
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.879 BCE Ashurnasirpal II; rebuild 697 BCE Sennacherib
- Period
- Neo-Assyrian Empire 879-612 BCE
- Culture
- Assyrian Neo-Assyrian imperial engineers
- Builders
- Ashurnasirpal II and Sennacherib hydraulic corps
- Purpose
- Tigris flood regulation and canal cascade supply to Kalhu and Nineveh
- Abandoned
- 612 BCE Fall of Nineveh; partial collapse
- Rediscovered
- 1970s Reade excavation; 2016 Reade & Fales prism publication
- Excavation
- Partially excavated
879 BCE
Ashurnasirpal foundation prism burial
697 BCE
Sennacherib rebuild for Nineveh canal
1978
Reade exposes bitumen-mortared weir
On the ground
Structures & features
36.1000° N · 43.3300° E · 220 m · 2 mapped features
Central Sluice Bay
hydraulic4-m wide gated sluice with bitumen seal and timber tie impression
36.1010° N · 43.3320° EKalhu East Wall Buffer Marsh
natural featureMarshy weir impoundment protecting Kalhu east wall
36.0990° N · 43.3290° E
Gallery