Code of Practice - Irrigated Public Open Space - SA Water

IRRIGATION REQUIREMENT (Ir) EXAMPLE:
Site - Local soccer ground
Area - 1.2 hectare
Location - Adelaide metropolitan area
Turf species: quality standard - Kikuyu: TQVS Cat 3
Irrigation season - October – April inclusive
Climate period - Long term average
5.0 TURF & IRRIGATION MANAGEMENT PRINCIPLES
Irrigation Requirement (Ir) = Net Irrigation Requirement (In) / Application Efficiency (Ea)
Ir = In / Ea
Net Irrigation Requirement (In) = Crop Evapotranspiration (ETc) – Effective rainfall (Pe)
In = ETc - Pe
Crop Evapotranspiration (ETc) = Reference Evapotranspiration (ETo) x Crop Co-efficient (Kc) x Crop Stress Factor (Ks)
ETc =EToxKcxKs
= 1088 x 0.7 x 0.5
= 381 mm
Effective rainfall (Pe) = Total rainfall (P) x Effective rainfall Factor (Pf)
Pe = P x Pf
= 183 x 0.5
= 92 mm
Net Irrigation Requirement
In = ETc – Pe
= 381 - 92
= 289 mm
Application Efficiency
Ea = 0.80
Irrigation Requirement (mm)
Ir = In / Ea
= 289 / 0.80
= 362 mm
Irrigation Requirement (kL per ha)
Ir(kL/ha) = Ir(mm) x 10
= 362 x 10
= 3620 kL / ha
Irrigation Requirement (Site)
Ir(site) = Ir(kL per ha) x site area
= 3620 x 1.2
= 4,344 kL
Water Cost
= Ir(site) x Water cost ($ per kL)
= 4,344 x 1.16
= $ 5,039
20