alimiheb/SDG641-Tunisia-Water-Productivity

Projet d'analyse de la productivité de l'eau en Tunisie. # SDG 6.4.1 - Agricultural Water Productivity Analysis for Tunisia (2018-2023) ## 📊 Project Overview This project implements a comprehensive analysis of **Agricultural Water Productivity (AWP)** for Tunisia following the **SDG 6.4.1 indicator** methodology established by FAO. The analysis covers the period **2018-2023** and integrates satellite remote sensing data (WaPOR v3), national statistics (FAO AQUASTAT), and spatial analysis to assess water use efficiency in irrigated agriculture at both national and governorate levels. ### Key Objectives 1. Calculate SDG 6.4.1 indicator using three complementary methodologies 2. Validate satellite-based estimates against AQUASTAT data 3. Perform spatial analysis at governorate level (24 administrative units) 4. Generate publication-ready visualizations for technical reports and policy presentations 5. Provide actionable recommendations for water resource management --- ## 🎯 SDG 6.4.1 Indicator Definition **Agricultural Water Productivity (AWP)** measures the economic value generated per cubic meter of water used in irrigated agriculture: $$ \text{AWP} = \frac{\text{GVA}_{\text{irrigated agriculture}}}{\text{Volume of water used}} $$ ### Three Calculation Methods #### **Method 1: A_we (AQUASTAT-based) - Official SDG Method** $$ A_{we} = \frac{\text{GVA}_a \times (1 - c_r)}{V_a} $$ Where: - **GVA_a**: Gross Value Added from agriculture (USD) - **c_r**: Rainfed crop ratio (0.30 for Tunisia, 2018-2023 average) - **V_a**: Volume of water withdrawn for agriculture (m³) **Data source**: FAO AQUASTAT national statistics --- #### **Method 2: A_wp1 (Satellite + AQUASTAT hybrid)** $$ A_{wp1} = \frac{\text{GVA}_a \times (1 - c_r)}{V_{\text{ETb}}} $$ Where: - **V_ETb**: Volume of water evapotranspired by crops (m³) - Calculated from WaPOR v3 satellite data: $$ V_{\text{ETb}} = \sum_{pixels} \text{ETb} \times \text{Area}_{\text{pixel}} \times 10 $$ With: - **ETb**: Evapotranspiration from biomass production (mm/dekad) - ** …