Below is an illustrative chart (sourced from OECD’s publication Fragile States: Resource Flows and Trends) that shows the amount of aid money entering a country through various channels.
In Nepal, a large portion of foreign aid goes "non reported" and those reported are channeled through public sector, followed by NGOs, multilateral agencies, and others. No aid flowing through PPP (understandably so considering the lack of viable PPP institutional and regulatory frameworks). The report notes that Nepal is chronically under-aided (p.88, Box: 3.1).