NAT.B09 Water withdrawal
About the data
One-fifth of the world’s river basins are experiencing significant changes in surface water available in the last five years (UN Water, 2021). Increasing exploitation of water resources is likely to lead to disruptions in ecosystem services in terms of renewing and purifying water resources. This indicator is aligned with the SBTN interim target to reduce water withdrawal in the most material parts of the value chain in line with environmental flow needs by 2030.
A note on the scoring system
Wikirate uses a standardized 10-point scoring system to enable comparison of company scores across different benchmarks. In the Nature Benchmark, companies can earn 1 point per indicator, which are then added together and calculated as a percentage of the total score for a measurement area (MA) to determine the final score for the MA. The overall Wikirate score is calculated by combining these scores with the appropriate weightings, and converting them to a 10-point scale. For instance, if a company achieves a final score of 50, the corresponding Rating will be 5.
Formula
score = (x) -> if x == "Yes" 10 else 0 redistributed_weights = (weights, values) -> num_of_weighted_values = weights.length for value, index in values if value == "Not Applicable" num_of_weighted_values -= 1 redistributed_weight_value = weights[index] for weight, i in weights if weight == 0 continue weights[i] = weight + redistributed_weight_value/num_of_weighted_values weights[index] = 0 weights weights = (1/6 for i in [0...6]) water_withdrawal = [reduction_disclosure, reduction_target, water_stressed_area_dependency, withdrawal_from_water_stressed_areas, reduction_engagement, water_stressed_area_dependency_in_supply_chain] redistributed_weights(weights, water_withdrawal) weights.reduce((weighted_sum, weight, index) -> weighted_sum + weight*score(water_withdrawal[index]) , 0)
