The phrase "a certain water" is correct and usable in written English.
It can be used when referring to a specific type or source of water without naming it directly, often in a more abstract or poetic context.
Example: "In the garden, there was a certain water that seemed to shimmer under the moonlight, drawing all who passed by to its enchanting glow."
Alternatives: "a particular water" or "a specific water".
It was established that polymers with a certain water miscibility/solubility can be manufactured via NANEX.
An efficiency parameter is introduced that relates the actual performance of a reactor with the best possible performance for a reactor with a certain water flow, lamp power and UV transmittance.
In addition, a high proportion of water with respect to the wash load and a certain water degassing is required to assure efficiency and homogeneity in the wash performance.
The design of these facilities is formulated as a multi-objective mixed-integer nonlinear programming model (MINLP) that considers the simultaneous minimization of cost and environmental impact given a certain water demand to be fulfilled.
Then, beyond a certain water content threshold, the sorbed water molecules become freezable, but with a melting point lower than 0°C, due to their location in the second hydration layer.
For example, in a water infrastructure architecture, all measurements of a certain water gauge station are defined as one Observation Offering.
The test results indicated that below a certain water-to-cement ratio (0.40) elevated pressures lead to changes in the rheological properties, while changes were negligible when the ratio was above this threshold.
To improve the workability and compressive strength, this paper investigated the effects of viscosity modifying admixture (VMA) on the workability, segregation resistance, compressive strength and failure mode of a class of structural lightweight EPS concrete, prepared by controlling a certain water-binder ratio and fly ash replacement.
The ADEA study points notably - and justifiably - to a certain watering down of the values basis of the original policy document, the absence of a clear statement proposing affirmative action for disadvantaged children, and an avoidance of the decentralisation issue (Case Study on Mauritius, 2000, ADEA/WGECD Policy Studies Project).
This choice is due to price and the availability of a constant, certain water source throughout the year.
This is from an e-mail exchange [32KB PDF] in January when the agency was involved in a dispute with certain water companies over the regulation of sewage discharges from Combined Sewer Overflow (CSO) pipes.
