Hydro-logical Survey Report

A hydrogeological survey aids our efforts to investigate the hydrologic and geologic parameters at the subsurface level in a particular area.

The value of this exercise is the ability to evaluate the water-bearing levels of rocks and their capability for filtration which includes the assessment of the rock’s components to store or resist water. Our study also, enlightens surveyors with a better understanding of the pressure, type, and quality of the underground water, searching the intensity of the water flow through pores or fractures

Therefore, hydrogeological surveys may be conducted on a large, medium, or small scale depending on the purpose. We must ensure that available data from government and private agencies are assessed, followed by extensive fieldwork as required.

Our hydrogeological investigation projects have included water quality and water quantity assessments, mapping of unconsolidated and bedrock aquifers, subsurface and geophysical investigations and aquifer testing to assess dynamic water resource systems. Many projects have incorporated water supply, wastewater and storm water management components and have required local and state approvals and permitting.

What we offer

We write detailed hydrogeological survey reports following a site assessment for the purpose of environmental monitoring, borehole siting or as part of ongoing site investigations. Hydrogeological surveys determine the depth of the water table in the sub-surface. Our hydrogeological survey reports include analysis of resistivity measurements from the investigated site methods to reveal:

  • The thickness of subsurface layers
  • The ability of these layers to function as aquifers
  • The expected groundwater quality at the site

We also conduct a background review of previous site investigation reports and available published background hydrogeological reports, well records and geological mapping; review of geological and hydrogeological conditions present at the boreholes on the site. This includes a review of the following:

  • Results of groundwater level monitoring and interpreted groundwater flow directions and gradients;
  • Hydraulic conductivity testing results; and,
  • Groundwater quality results

Reasons for the Survey

The hydrogeological assessment typically comprises of (but is not limited to) the following tasks:

  • Ascertain the requirements of the client, location, yield and use
  • Hydrogeology, implications of the geology in terms of water bearing horizons, anticipated yield, hydraulic properties of each aquifer, groundwater flow direction, pathways and rates of flow.
  • Boreholes and abstractions in the catchment and region, including borehole logs and aquifer parameters (where known)
  • Catchment risk assessment, and risks to yield and quality, including the potential for planned activities to result in groundwater contamination and known or expected presence, distribution, concentration and risk from existing contamination.
  • Anticipated yield and quality of abstracted water
  • Borehole design and recommendations

Survey report contents

Hydro geological survey report is based on the findings observed while carrying out survey, it contains the following:

  • Expected quantity of water and recommended drilling depth
  • Geology map showing point(s) location
  • Topographic map*
  • Line profile data and map*
  • Existing Borehole data analysis
  • Vertical Electrical Sounding results for the sites selected for drilling
  • Some information of interest to Client

Prior to drilling a borehole, hydrogeological surveying is performed to determine the quality and quantity of water available at a specific location.  The results of the surveying are documented in hydrogeological survey reports. Underground water has long been recognized as a superior source of drinking water to surface water. This is because of the following factors:

  • Groundwater has a lower pollution risk, especially if it is twenty meters away from sanitary work.
  • As water flows through sand and stone, it is naturally purified.
  • Borewells remain closed, reducing the possibility of contamination.
  • Regardless of the season, the water temperature at the underground level is always desirable.
  • More water availability in the summer because the water sources are located at a deeper level.
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