delta h Ingenieurgesellschaft

What delta h Ingenieurgesellschaft does

delta h Ingenieurgesellschaft mbH is a privately held German engineering consultancy and software company specializing in numerical simulation models for hydrogeological and hydrological applications. Founded around 1980 and headquartered in Witten, Germany, with an additional office in Pretoria, South Africa, the firm operates at the intersection of proprietary software development and project-based consulting. Its core customers are municipal waterworks, government authorities (municipal, regional, and federal), mining operators, construction firms, and geothermal energy developers in Germany and select international markets.

The firm's flagship product is SPRING, a proprietary finite element method (FEM) based numerical modeling system for groundwater system simulation that has been continuously developed for over 40 years. SPRING supports 3D groundwater flow, heat transport, solute transport, density-dependent flow, and surface water interaction. STRING 3 is a companion 3D visualization software co-developed with Fraunhofer ITWM, using Pathlets and trail-animation techniques (Schweifanimation) to render transient groundwater flow scenarios. The proprietary methodology RUBINFLUX provides implicit groundwater recharge calculation. The software portfolio is offered in tiers (SPRING Basic to Premium, STRING 3 single-user license at EUR 1,500) with training (EUR 1,200 per day) and maintenance contracts on demand.

delta h derives revenue from four streams: one-time software licensing (SPRING, STRING 3), professional services and consulting (mining, water supply, construction dewatering, groundwater remediation, geothermal, ecological restoration), software training, and recurring maintenance/support contracts. Customer acquisition combines direct enterprise consulting (long-cycle, multi-stakeholder engagements with utilities, mining firms, and government agencies) with product-led growth via dedicated SPRING and STRING 3 websites offering downloadable trials, online shops, and contact forms. The company participates in multiple publicly funded R&D consortia (WINZER, Heatstore, Grubenwärmespeicher Bochum, GECO, EUSSaWa) and hosts the biennial SPRING User Conference, with the 15th edition held in July 2025. The company is founder-managed by Prof. Dr. Christoph M. König, who has led the firm since 2001 and holds an honorary professorship at Ruhr-Universität Bochum.

Name

delta h Ingenieurgesellschaft

Legal name

delta h Ingenieurgesellschaft mbH

Website

https://delta-h.de

Company type

Private

Founded year

1980

Operating status

Operating

Headcount range

11–50 employees

Short description

delta h Ingenieurgesellschaft is a privately held German engineering consultancy that develops and sells SPRING and STRING 3 numerical groundwater modeling and visualization software, serving mining operators, water utilities, government authorities, construction firms, and geothermal developers in Germany and select international markets.

Ownership category

akta.pro rank

Product category

Groundwater Modeling Software

NAICS

Geophysical Surveying and Mapping Services (541360)

SIC

Services-Commercial Physical & Biological Research (8731), Services-Computer Integrated Systems Design (7373)

akta.pro primary industry

Water, Wastewater & Hydraulics Engineering Consulting (BPAHAIAD)

akta.pro secondary industries

Groundwater & Contaminant Fate/Transport Modeling (MODFLOW/MT3D, Plume Modeling) (EUAHAKAG), Contaminant Fate & Transport Modeling (Groundwater/Soil Vapor) (EUAHAFAD)

Keywords

• Groundwater modeling software
• Hydrogeological consulting services
• Finite element simulation
• Water resource engineering
• Groundwater flow modeling

Headquarters

HQ city

Witten

HQ country

Germany

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Software

Cost components

Personnel, Technology or R&D, Operations, Marketing or Sales, Infrastructure, Others

Revenue model

1. Software Licensing (SPRING and STRING): Sale of software licenses for SPRING (available in Basic to Premium tiers, expandable post-purchase) and STRING 3 (single-user license). Software is sold directly via websites with contact/request pricing. The company has been developing SPRING for over 40 years, indicating a long-standing licensing business.
2. Professional Services and Consulting: Engineering consultancy services for groundwater system modeling, including project-specific consulting for mining, water supply, construction, groundwater remediation, geothermal energy, and ecological projects. Services include numerical model development, expert opinions (Gutachten), feasibility studies, and monitoring.
3. Software Training: Training packages for STRING 3 (1-day training for one person in Witten, priced at 1,200 EUR + VAT). SPRING training and support also offered. Maintenance and support contracts available on demand.
4. Software Maintenance and Support: Ongoing maintenance contracts for software users, including future updates and phone support. Offered on demand.

Pricing tiers

Go-to-market motion2 records

Distribution channels4 records

Marketing channels6 records

Core offering

delta h Ingenieurgesellschaft develops and sells the proprietary SPRING numerical simulation software for groundwater system modeling (groundwater flow, heat transport, solute transport, density-dependent processes, and surface water interaction) and the STRING 3 3D transient flow visualization software co-developed with Fraunhofer ITWM. The company also delivers project-specific hydrogeological and hydrological consulting services covering mining water management, water supply planning, construction dewatering, groundwater remediation, geothermal energy, density-driven processes, ecological renaturation, and high-end visualization for museums and exhibitions.

Product overview

delta h Ingenieurgesellschaft offers a unified product portfolio centered on SPRING and STRING 3 software, both developed in-house over 40 years. SPRING is the core numerical simulation platform for groundwater system modeling, supporting groundwater flow, heat transport, and solute transport processes. STRING 3 serves as the visualization companion product for intuitive 3D rendering of transient water flow scenarios, co-developed with Fraunhofer ITWM. The portfolio is complemented by specialized consulting services spanning mining, water supply, construction dewatering, groundwater remediation, geothermal energy, visualization, groundwater recharge, density processes, and ecological restoration. The company operates primarily in German-speaking markets with offices in Germany (Witten) and South Africa (Pretoria).

Differentiator

Problem solved

Functional benefit

Products and services

• SPRING Professional numerical simulation software for groundwater system modeling based on finite element methods, supporting groundwater flow, heat transport, and solute transport processes with or without surface water interaction. Offered in Basic through Premium tiers and sold to mining, water supply, construction, geothermal, and environmental organizations.
• STRING 3 Advanced 3D visualization software for intuitive rendering and animation of transient water flow scenarios using pathlet technology and trail animation. Co-developed with Fraunhofer ITWM and sold as a single-user license with optional training and maintenance packages.
• Mining (Bergbau) Consulting Environmental consulting services for mining projects including groundwater impact assessment, water management, flooding analysis, subsidence evaluation, and long-term effects studies. Targeted at mining operators and authorities.
• Water Supply and Water Management (Wasserversorgung und Wasserwirtschaft) Consulting Consulting services covering water extraction facility design, quality management, resource assessment, bank filtration calculations, water budgeting, catchment area assessments, and groundwater recharge analysis for municipal waterworks and utilities.
• Building Projects (Bauvorhaben) Consulting Construction water management consulting including transient groundwater analysis and dewatering calculations for infrastructure projects such as canals, tunnels, and underground parking. Targeted at construction companies and civil engineers.
• Groundwater Remediation (Grundwassersanierung) Consulting Groundwater remediation consulting using numerical modeling to design targeted cleanup measures based on pollutant and groundwater conditions, including Natural Attenuation assessments, pollutant spread forecasts, reactive transport calculations, and tracer test conception.
• Geothermal Energy (Geothermie) Consulting Geothermal project analysis services including potential assessment, deep and near-surface geothermal system evaluation, groundwater impact analysis, heat expert reports, and pump test planning for accurate cost planning.
• Visualization (Visualisierung) Services Professional high-end visualization services for museum exhibits and public communication projects, including 3D animations, large-format renders, and interactive tools such as the "Cycle of Salt" interactive tool.
• Groundwater Recharge (Grundwasserneubildung) Consulting Consulting services applying the RUBINFLUX methodology to determine spatially and temporally high-resolution stationary and transient groundwater recharge rates, used as a significant parameter in model calibration.
• Density Processes (Dichteprozesse) Consulting Numerical modeling services addressing complex density-dependent flow situations such as freshwater-saltwater interfaces in coastal aquifers and thermal water applications.
• Ecological Issues and Renaturation (Ökologische Fragestellungen) Consulting Ecological restoration consulting using models for water-dependent ecosystem analysis, including bogs and moor rewetting, waterway renaturation, water balance, and climate scenario projections.

Quantifiable outcome

• SPRING User Conference held for 15 consecutive editions (2010-2025), demonstrating sustained market engagement and product development over more than a decade.
• +3 more outcomes

Named customers7 records

Segments6 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature10 records

Partnerships

Twelve partnerships are on record, tiered core and minor.

• Fraunhofer ITWM (Kaiserslautern)coreTechnology or IntegrationJoint development of STRING 3 visualization software with Fraunhofer Institut für Techno- und Wirtschaftsmathematik (ITWM) in Kaiserslautern. Fraunhofer ITWM contributes advanced mathematics (Finite Pointset Method, meshfree methods) while delta h contributes hydrogeological domain expertise. STRING 3 is co-owned/co-developed IP and represents a core product alongside SPRING. The partnership has been ongoing since at least the STRING project initiation.
• Fraunhofer IEG BochumcoreStrategic or Co-development PartnerPartnership in multiple mine thermal energy storage research projects including Heatstore (international R&D project for high-temperature mine thermal energy storage pilot plant) and WINZER (seasonal heat storage in coal mine water). Fraunhofer IEG is the lead coordinator for these projects, with delta h providing accompanying numerical modeling (TH models), model validation, and heat storage scenario analysis. Fraunhofer IEG operates its own drilling rig (Bo.Rex) for mine exploration.
• Internationales Geothermiezentrum Hochschule BochumcoreStrategic or Co-development PartnerCollaboration partner in Wärmespeicherung in Bergwerken (Mine Thermal Energy Storage - MTES) project at the Prosper-Haniel mine site in Bottrop (Innovation City). Also partner in Grubenwärmespeicher Bochum project. Contributes geothermal expertise to mine water heat storage research.
• Stadtwerke Bochum HoldingminorStrategic or Co-development PartnerPartner in the Grubenwärmespeicher Bochum feasibility study. Stadtwerke Bochum Holding is the future operator of the pilot plant and manages district heating network (110 MW installed capacity) to which the heat storage will supply. Contributes to project development and operational planning.
• Technische Universität Bergakademie FreibergcoreStrategic or Co-development PartnerPartner in the WINZER project (BMBF-funded) alongside Fraunhofer IEG and Ruhr-Universität Bochum. Contributes thermodynamic expertise (Lehrstuhl für Technische Thermodynamik, tTD) to the multi-scale modeling concept for seasonal thermal energy storage in groundwater-filled underground coal mines.
• Ruhr-Universität Bochum (RUB)coreStrategic or Co-development PartnerPartner in WINZER project contributing multiple chairs: Lehrstuhl für Siedlungswasserwirtschaft und Umwelttechnik, Lehrstuhl für Hydrogeochemie, and Lehrstuhl für Geothermische Energiesysteme. RUB is also the academic origin of SPRING software development. Managing Director Prof. Dr. König holds a honorary professorship at RUB.
• RAG AktiengesellschaftminorStrategic or Co-development PartnerPartner in the Wärmespeicherung in Bergwerken (MTES) project. RAG is the legal successor to mining rights (Bergrechtsnachfolger) and must coordinate private law matters between RAG and STW Bochum for the pilot plant operation.
• Bundesministerium für Wirtschaft und Technologie (BMWi) / Bundesministerium für Bildung und Forschung (BMBF)coreOthersFunding bodies for multiple R&D projects including: WINZER (BMBF, PtJ), Prognosewerkzeug Nitratausbreitung (BMWi InnoNet), Kluft-Matrix-Systeme (BMBF), PATHlets Animation (BMWi), Wärmespeicherung in Bergwerken (BMWi), Heatstore (BMWi), and EUSSaWa (BMBF KMU-Innovationsoffensive). Funding enables international and national research collaborations.
• C & E GmbH (Chemnitz) / BioPlanta GmbH (Leipzig) / LogAqua / Innova (Debrecen)minorStrategic or Co-development PartnerInternational consortium partners in the Constructed Wetlands (Thermalwasser) project. C & E GmbH and BioPlanta GmbH provide water treatment expertise; LogAqua and Innova are Hungarian partners. The project develops constructed wetlands for treating highly mineralized thermal water in Hungary to meet EU Water Framework Directive requirements.
• AUD Analytik- und Umweltdienstleistungs GmbH (Chemnitz) / Bauhaus-Universität Weimar / BioPlanta GmbH (Leipzig)minorStrategic or Co-development PartnerPartners in the EUSSaWa project (Decision Support System for Saline Waters) funded by BMBF. AUD provides analytical and environmental services; Bauhaus-Universität Weimar contributes academic expertise; BioPlanta GmbH provides biotechnology capabilities for saline water treatment.
• ahu AG (Aachen) / BKR Aachen / Brenk Systemplanung GmbH / FORALITH AG / IWW Rheinisch-Westfälisches Institut für WasserforschungminorStrategic or Co-development PartnerProject consortium for Erdgasförderung durch Fracking (hydraulic fracturing risk assessment) study for the NRW Environment Ministry. ahu AG and IWW provide water expertise; BKR provides urban planning; Brenk provides system planning; FORALITH provides geological expertise. delta h contributes groundwater modeling capabilities.
• VINACOMIN (Vietnam National Coal – Mineral Industries Holding Corporation)minorStrategic or Co-development PartnerInternational partnership in Vietnamese mining sector. Dr. Katrin Brömme led a project office at VINACOMIN in Hanoi from 2005-2018, working on mine water management in Vietnamese hard coal mines. Projects included RAME 1 and RAME 2 (Mining and Environment in Vietnam) developing technical and planning environmental concepts.

Scale indicators5 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Arcadis: Arcadis is a global environmental and water engineering consultancy whose hydrogeology practice competes with delta h's consulting services on large mining remediation, water supply, and infrastructure projects. They operate at much larger scale and frequently serve as prime contractor where delta h might serve as specialist subcontractor.
• Ramboll: Ramboll is a major European environmental and water engineering consultancy with significant hydrogeology capacity across Northern Europe and Germany. They address similar groundwater, mining water, and remediation problems as delta h but at materially larger scale, often serving as prime consultant on cross-border projects.
• Fugro: Fugro is a global geotechnical and site investigation specialist whose environmental and groundwater services overlap with delta h's mining hydrogeology and site assessment work. Fugro brings much larger field-data collection and integration capabilities alongside comparable modeling competencies.
• COMSOL: COMSOL Multiphysics is a general-purpose FEM platform with groundwater flow and transport modules used by some hydrogeology teams as an alternative to specialized tools like SPRING. While broader in scope, COMSOL competes for the same engineering customer budget and can substitute for SPRING in academic and research settings.
• WSP Global (including Golder Associates): WSP acquired Golder Associates, building one of the world's largest environmental and geotechnical consultancies. Their hydrogeology teams compete directly with delta h on groundwater modeling, mining water management, and remediation work at global scale.

Emerging players

• RockWare: RockWare provides specialized geoscience and hydrogeology software (including RockWorks and links to MODFLOW-based tools) aimed at smaller consultancies and academic users. They are a smaller competitor with overlapping niche use cases for groundwater visualization and modeling workflows.

Direct peers

• Itasca Consulting Group: Itasca develops hydrogeological and geomechanical software (MINEDW, XSite, FLAC) used for mine dewatering, fractured rock flow, and subsurface analysis. Their tools and consulting footprint overlap directly with delta h's mine hydrogeology and groundwater modeling work, particularly in mining and geotechnical applications.
• Aquaveo: Aquaveo develops GMS (Groundwater Modeling System), a widely used GUI for MODFLOW, FEFLOW, and other codes. They compete with delta h in the same buyer category (hydrogeologists needing integrated groundwater modeling environments) and offer alternative commercial software with broader code coverage than SPRING.
• DHI A/S: DHI (formerly DHI Group) is the developer of FEFLOW, the most direct commercial competitor to SPRING in finite-element groundwater modeling. Both target hydrogeologists in water utilities, mining, and consulting with comparable FEM-based simulation capabilities, making DHI the closest like-for-like peer for delta h's software and consulting offering.
• Waterloo Hydrogeologic (now part of Schlumberger / Aquanty): Waterloo Hydrogeologic built Visual MODFLOW, the long-standing graphical interface for the USGS MODFLOW family, and HydroGeoSphere is now commercialized via Aquanty. Both directly compete with SPRING in the hydrogeological modeling software category, addressing similar groundwater flow, transport, and visualization use cases.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/delta-h-germany

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about delta h Ingenieurgesellschaft