Source
https://www.gdc.govt.nz/__data/assets/pdf_file/0025/13687/calculation-of-the-costs-of-providing-additional-irrigation-capability-through-damming.pdf — original source (opens in a new tab; the file is not redistributed)
Context: ni · Feeds D03 + D02 (irrigation dam CapEx)
Summary
A disclosed NZ cost for building an earth embankment irrigation dam, expressed per cubic metre of storage, which the model needs to size the irrigation dam that makes food-growing self-sufficient. It is the earth-dam counterpart to the lined-pond figure in OT_217, and it shows the model’s assumed $5/m³ is high for an unlined earth dam.
Key claims
- claim: "EARTH IRRIGATION DAM COST. An earth embankment dam costs between $2 and $3 per m³ of storage to construct, depending on size, site difficulty and whether it must be lined (lower end unlined, upper end lined). On top of construction: engineering and design ~10% of construction, consenting ~5%, annual O&M ~4.5% of capital (2.5% repairs + 2% operation); land purchase separate (~$15,000/ha). [verified against the raw: 'between $2 and $3' confirmed]"
source_location: "Gisborne DC / AquaLinc (2016), quoting AquaLinc's estimate; cost split in Table 3."Model use
- The earth-dam value for
irrigation_dam_capex_nzd_per_m3in D03: **~2.5/m³** construction (~2.9/m³ all-in with the +15% design and consenting). The model’s assumed $5/m³ describes a lined pond, not an earth dam, so the two should be split. OT_216
Notes
- Caveat. The rate comes from a large scheme dam (9.2 M m³); add a small-scale premium for a community-scale (5,000-50,000 m³) store.
- Provenance. Gisborne DC report (AquaLinc), authoritative; retrieved from a Wayback Machine snapshot. Figure verified against the raw.
Connections
Links to
EDT domains (2): D02: Smart Food Systems & Agriculture · D03: Water, Waste & Circular Systems
Sources (1): OT_217
Referenced by
EDT domains (1): D03: Water, Waste & Circular Systems
Sources (1): OT_217