1997年，德克萨斯州的高地公园镇建成了一条下水道 系统评估研究 东区废水收集系统。 该研究提出的改进建议 被纳入了一个五年计划 康复计划。一部分 计划中的污水管道更换位于 在与水线相同的地役权范围内 占据更换水管的必要性 由于条件，以及增加 尺寸从6英寸到8英寸，已解决 包括总水管更换件 下水道更换项目。 类似地役权中的早期施工 采用明挖法可获得较高的效率 建设成本和冗长的、破坏性的 施工期。在该镇的其他地区，已经使用了非开挖技术 成功地更换了下水道。为什么不考虑用同样的技术来代替 水镇上的人认为，如果承包商用非开挖方法替换水， 这种干扰将是最小的，而接入对建筑成本的影响也将更小。 一旦决定将非开挖方法视为开放的建筑选择。 下一步是评估可用于供水的非开挖系统的类型 已成功用于至少700线性英尺安装运行的更换件。 本文讨论了爆管、水平定向钻井和工程建设。包括数字。

In 1997, The Town of Highland Park, Texas completed a Sewer System Evaluation Study (SSES) on the eastside wastewater collection system. Recommended improvements from the study were incorporated into a five-year rehabilitation program. A portion of the planned sewer line replacements is located within the same easements that the water lines occupy. The need to replace the water lines due to condition, as well as to increase the size from 6-inches to 8-inches, was addressed by inclusion of the water main replacements with the sewer replacement projects. Earlier construction in similar easements using open cut methods resulted in high construction costs and lengthy, disruptive construction periods. In other areas of the Town, trenchless technology has been used successfully to replace sewer lines. Why not consider using the same technology to replace the water? The Town believed if the contractor were to replace the water using trenchless methods, the disruption would be minimal, and access would be less of a factor in the construction costs. Once the decision was made to consider trenchless methods as a construction alternative to open cut, the next step was to evaluate the types of trenchless systems that were available for water replacement that have been successfully used for installation runs of at least 700 linear feet. This paper discusses pipe bursting, horizontal directional drilling, and project construction. Includes figures.