Groundwater Intelligence
The saturated system, read for what it is telling you
C2 · Dubai Municipality baseline groundwater · Dutch Intervention Values
Baseline groundwater assessment and hydrogeological interpretation. Not a transcription of laboratory results: the chemistry is read for recharge source, salinity origin and contaminant signature, and every comparison is made against a registered screening value or reported as having none.
How the assessment reasons
Mechanism first, chemistry second, an exceedance table is a finding, not an assessment
A groundwater result is a number until a mechanism explains how the water got there. The assessment establishes the physical picture first, the hydrostratigraphy, the hydraulic role of each layer, the water-table geometry, and only then reads the chemistry against it. The chemistry confirms, refines or falsifies that conceptual model; it is never the sole basis for one.
Read this way, a determinand with no threshold can be the most diagnostic figure in the dataset. Boron indexes the domestic wastewater cycle; nitrate indexes turf fertiliser; a geogenic metal mobilised by a change in pH or ionic strength indexes a condition rather than a source. The assessment attributes the source of a chemistry, it does not name a liable party or quantify damages.
Parameter coverage
The forty-five parameters the schedule names, checked for presence and for unit
The Dubai Municipality Appendix 3 baseline groundwater schedule lists forty-five parameters across four groups, alongside the sampling metadata it requires, location coordinates, date and time, purging method and depth to water level. The prescribed reporting units are enforced against the laboratory certificate, not assumed to match it.
Physical parameters
Items 1-8 of the schedule
- pH
- Temperature (°C)
- Colour
- Turbidity (NTU)
- Electrical conductivity (µS/cm)
- Total dissolved solids (mg/L)
- Total hardness (mg/L as CaCO₃)
- Residual chlorine (mg/L as Cl₂)
Inorganic parameters
Items 9-32, major ions in mg/L, dissolved metals in µg/L
- Sodium, potassium, calcium and magnesium (mg/L)
- Sulphate, nitrate, phosphate and chloride (mg/L)
- Total nitrogen (mg/L)
- Aluminium, arsenic, cadmium, chromium, cobalt and copper (µg/L)
- Iron, lead, molybdenum, boron, barium and beryllium (µg/L)
- Manganese, zinc and mercury (µg/L)
Miscellaneous parameters
Items 33-42, hydrocarbons, organics and demand
- Oil and grease, free oil (mg/L)
- Non-chlorinated pesticides (mg/L)
- Phenols (mg/L)
- Benzene (mg/L)
- Hydrogen sulphide (mg/L)
- Total cyanide (mg/L)
- Dissolved oxygen (mg/L)
- Biochemical oxygen demand (mg/L)
- 1,2-dichloroethane and dichloromethane (mg/L)
Microbial parameters
Items 43-45 of the schedule
- Escherichia coli (CFU/100 ml)
- Total coliform (CFU/100 ml)
- Total bacterial count (CFU/100 ml @ 37 °C)
The schedule prescribes the fifteen dissolved metals in µg/L, where a laboratory commonly reports them in mg/L, a clean factor of a thousand. The conversion is made explicitly, through a registered conversion table, with both values retained. It is never applied silently, because a silent conversion in that direction would turn an exceedance into a pass. Where a required parameter is absent from the data it is reported as absent, never inferred.
Screening rules
Three governing rules decide which value a result is measured against
The schedule's own governing notes set the screening basis, and which limit set applies turns on whether the area is a protected area, a regulatory designation, not something the engine decides for you. Absent an asserted protection status, both comparisons are run and reported side by side, each labelled with the basis it used.
Note i
Detection limits
The WHO drinking-water standard sets the lower detection limit a laboratory must achieve. A result reported at a limit above the required one is inconclusive, not a clean non-detect, and is reported as such.
Note ii
Outside a protected area
The Dutch Intervention Values (DIV, 2000) provide the screening comparison. A DIV is a screening and intervention value, not a UAE compliance standard, so a result is never described as “compliant” or “within limits” against it.
Note iii
Inside a protected area
The WHO drinking-water limits apply. Where the two bases would give different answers, the difference is shown rather than resolved on your behalf.
Where the selected standard set holds no threshold for a diagnostic determinand, that is not reported as comfort. The absence is stated, and a fit-for-purpose benchmark is sought and cited by name in the same breath, or its absence is stated too. Silence is never reported as a pass.
What you receive
The groundwater assessment deliverable
- The DM Appendix 3 baseline groundwater schedule: 45 physical, inorganic, organic and microbiological parameters, with the prescribed reporting units enforced
- Sampling metadata as required: location coordinates, date and time, purging method and depth to water level
- Data quality assurance, including charge balance on a meq/L basis, with qualifiers such as < and > preserved rather than discarded
- Comparison against the applicable screening values, including the Dutch Intervention Values where they apply; where no threshold is registered, that is reported explicitly and never filled with an assumed value
- Hydrochemical facies and major ion ratios, and what they indicate about recharge source and evaporative concentration
- Conceptual hydrogeological model: hydrostratigraphy, flow controls, perched or confined conditions, and preferential pathways
- Source-pathway-receptor analysis, monitoring recommendations and management recommendations
Certification
Software scales the specialist. It does not replace them.
The engine applies the specialist's own standard consistently, the same rule in the executive summary as in the limitations section, on every claim, every time. A certified groundwater assessment is then reviewed claim by claim and signed by Gary Morgan. Certification is a human act, performed by a named person, and we say so.
Gary Duwayne Morgan
Principal Hydrologist and Director, Water Resources & Environmental. Approximately 20 years of international consulting experience.
- Professional Natural Scientist (Pr.Sci.Nat), SACNASP Reg. No. 400155/11
- MSc Hydrology, University of KwaZulu-Natal, 2009
- Dubai ESD Environmental Codes C2 and D, Reg. No. 001/2025, previous registration; renewal submitted