Higher Water Reuse vs Higher Water Quality

Business Context

Reusing drainage water, treated wastewater, captured runoff, or other water sources can reduce demand for freshwater and increase resilience under supply constraints. Reused water, however, may contain salts, nutrients, pathogens, sediments, or other constituents that restrict its suitability for particular crops, soils, livestock, or production uses. Requiring freshwater-quality standards for every application can make reuse economically impractical.

Agriculture TRIZ Resolution

Water quality should be matched to the requirements of the function it performs. Different water streams can be treated, blended, stored, or allocated according to their characteristics and intended uses. High-quality water can be reserved for sensitive applications while lower-quality water serves functions with less restrictive requirements, provided regulatory and safety conditions are satisfied.

Applicable TRIZ Principles

Principle 3 – Local Quality matches water quality to specific agricultural uses.

Principle 1 – Segmentation separates water streams according to quality and application requirements.

Principle 35 – Parameter Changes modifies water characteristics through treatment, blending, or controlled dilution.

Expected Outcome

Greater water reuse

Reduced freshwater demand

Appropriate water quality for sensitive functions

Improved water-system resilience

Decision Indicators

Early indicators include:

Reusable water is discarded because it cannot satisfy the most demanding application.

Freshwater is used for functions that do not require high-quality water.

Water-quality characteristics vary significantly among available sources.

Treatment systems process all water to the same specification.

Water scarcity increases while recoverable flows remain unused.

These indicators suggest that water should be allocated according to fitness for purpose rather than a single quality standard.