search

KTH-dESA / FAO

MIT License
5 stars 4 forks source link

Check Peak Crop Water Requirement formula #25

Open camiloramirezgo opened 5 years ago

camiloramirezgo commented 5 years ago

In the original code the Peak Water Demand (PWD) was calculated based on the Peak Crop Water Requirements (PCWR), the pumping hours per day and the distribution and application efficiencies. The PWD is then used to account for the power generation capacity required to cope with such peak in every month. Currently the PCWR is being calculated as: https://github.com/KTH-dESA/FAO/blob/5be15f8e6986178cf7c9e616e767c9c515b31a7e/nexus_tool/water_demand.py#L304

Where the following factors and assumptions were used:

  1. Crop Water Requirement, CWR (m3/ha) = CWR (mm) * 10
  2. Average Crop Water Requirement (m3/ha/d) = (CWR (m3/ha) / Length of crop duration (days))
  3. Assuming here that the lenght of the season is 30 (1 month)
  4. Assuming that the Peak Crop Water Requirement = 2 * average crop water requirement (m3/ha/d)
  5. conversion factor from (m3/d/ha) to (l/sec/ha) is 0.012

It is necessary to generalise this formula in order to compute the PCWD based on the WEAP input data, using the right units and factors.

camiloramirezgo commented 4 years ago

This formula is OK as it is based on FAO guidelines. However, this has not been implemented in the Nexus tool but directly computed in the Souss Massa model. This should be also implemented for the Jordan model or included as a method in the Nexus tool.