Environmental Flow Policy · Nepal Energy Wiki

Summary

The IPSDP executive summary treats environmental flow and protected-area restrictions as buildability constraints, not as side notes. In the SEA mitigation table on page 37, MoEWRI IPSDP Executive Summary says hydropower planning must evaluate and manage environmental flows and must respect statutory restrictions in protected areas.

Simple Explanation

Environmental flow policy is the rule-of-thumb that a hydropower project cannot treat the whole river as available for diversion. Some flow must remain for downstream ecology, communities, legal requirements, and protected-area constraints.

What the IPSDP says directly

Hydropower can alter downstream flow, habitat continuity, and river-wide flow patterns.
Where adverse effects are expected, project planning should refer to the IFC Good Practice Handbook: Environmental Flows for Hydropower Projects (2018) and build an explicit E-flow management plan.
For projects inside national parks, wildlife sanctuaries, hunting reserves, conservation areas, or buffer zones under Nepal's National Parks and Wildlife Conservation Act (2029/1973), prior permission is required.
The same table says river modification and damming are not assumptions a developer can make inside protected areas; maintenance-flow and mitigation requirements remain in force.

Why this matters

This is one of the clearest official signals in the current wiki that hydropower potential categories are not simply a matter of head and discharge. Protected-area law, river-ecology constraints, and mitigation hierarchy all cut directly into what is realistically developable.

That makes this page a direct bridge between Buildability, Hydropower Potential Categories, and GLOF Risk: those concepts are all about why paper potential collapses when real-world constraints are applied.

Confidence boundary

This page is limited to the policy and mitigation language stated in the IPSDP executive summary. It does not attempt to summarize Nepal's whole EIA or hydropower-permitting regime beyond what that table states.

Common Misunderstandings

Environmental flow is not only an environmental side issue. It changes buildable energy, project design, and licensing risk.
Protected-area restrictions are not captured by MW potential alone. A technically attractive site can still be constrained by law and mitigation requirements.
This page is not a full legal guide. It summarizes the IPSDP signal, not the entire permitting regime.