natural_disaster_great_project_mandatory_investment_reward_effect

natural_disaster_great_project_mandatory_investment_reward_effect = {
	if = {
		limit = { this = scope:owner }
		if = {
			limit = { is_valid_for_legitimacy_change = yes }
			add_legitimacy = natural_disaster_great_project_mandatory_investment_legitimacy_gain_value
		}
		else = {
			add_prestige = minor_prestige_gain
			add_piety = minor_piety_gain
		}
	}
	else_if = {
		limit = { is_governor = yes }
		change_influence = minor_influence_gain
		increase_governance_effect = { VALUE = 2 }
	}
	else = {
		add_prestige = medium_prestige_gain
		add_piety = medium_prestige_gain
	}
	if = {
		limit = {
			government_allows = merit
			this != title:h_china.holder # Chinese Emperor does not "use" merit
		}
		change_merit = {
			value = medium_merit_gain
		}
	}
}

As written in game/common/scripted_effects/10_dlc_tgp_natural_disaster_scripted_effects.txt.