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LNAPL Distribution and Recovery Model (LDRM)

Prepared for API under contract by:
Randall Charbeneau, Ph.D., P.E.
The University of Texas at Austin


The API LNAPL Distribution and Recovery Model (LDRM) simulates the performance of proven hydraulic technologies for recovering free-product petroleum liquid releases to groundwater.

Model scenarios included in the LDRM are hydrocarbon liquid recovery using: single- and dual-pump well systems, skimmer wells, vacuum-enhanced well systems, and trenches. The LDRM provides information about LNAPL distribution in porous media and allows the user to estimate LNAPL recovery rates, volumes and times.

The LDRM package contains:

  • LDRM application and associated files
  • API Publication 4760: LNAPL Distribution and Recovery
    • Volume 1 - Distribution and Recovery of Petroleum Hydrocarbon Liquids in Porous Media
    • Volume 2 - User and Parameter Selection Guide

Volume 1

Distribution and Recovery of Petroleum Hydrocarbon Liquids in Porous Media documents the LDRM and is presented as a supplement to API Publication Number 4682, Free-Product Recovery of Petroleum Hydrocarbon Liquids, which was published in June 1999, and to API Publication Number 4729,Models for Design of Free-Product Recovery Systems for Petroleum Hydrocarbon Liquids; A User's Guide and Model Documentation, which was published in August 2003 and included in the API Interactive LNAPL Guide. View More Info

Volume 2

User and Parameter Selection Guide is a detailed guide to use of the LDRM software application. Four example problem applications are presented which highlight model use, parameter estimation using the API LNAPL Parameters Database, and limitations of scenario-based models. View More Info

To Obtain Publication 4760:

Complete and submit the form below to download this document.

Terms & Conditions

You expressly acknowledge and agree that the information contained in the download is being provided on an "as-is" basis, without warranty of any kind, express or implied, including without limitation any warranty regarding the accuracy or content of the information.
You further understand and agree that use of any and all information contained in the spreadsheets is at your own sole risk.

You understand that the LDRM software and Publication 4760 are the copyrighted property of API and cannot be sold by you or another party without the prior written approval of API.

You release API, its members and employees, from any claims and damages you may have from accessing, using the information contained herein, and you agree to defend and indemnify API for any claims and/or damages that arise directly or indirectly from your use of the spreadsheets or the information contained therein.

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