PTPP Implements Hydroseeding Innovation In The Bagong Trenggalek Dam Project

Photo: Doc. PTPP

JAKARTA - PT PP (Persero) Tbk (PTPP) a national construction and investment company under Danantara Indonesia, continues to provide sustainable infrastructure solutions. Through the construction of the Bagong Package III Dam in Trenggalek Regency, East Java, PTPP not only builds water security, but also protects the environment with the latest environmentally friendly technology, namely Hydroseeding.

With a contract value of IDR 402.3 billion (including VAT) and an implementation period of 376 calendar days (20 December 2024 - 31 December 2025), the current project progress has reached 40.65 percent as of August 31, 2025, faster than the target. This dam is expected to be a vital infrastructure that provides direct benefits to the people of Trenggalek.

The construction of the Bagong Dam has a uniqueness, one of which is the Ogee type Spillway design equipped with two Stilling Basin as an energy damper. The spillway foundation stands on colluvial rock with Boredpile strengthening, so as to control the flow of water optimally while preventing erosion.

In addition to the uniqueness of the dam design, the strategic benefits felt by the community from the construction of the Bagong Dam include a raw water supply of 153 liters/second of irrigation for an area of 977 hectares and reducing the risk of flooding in the Trenggalek City area from 203 m3/second to 44 m3/second. With this benefit, the Bagong Dam is expected to support the agricultural sector, maintain clean water supply, and minimize the impact of flooding on the Trenggalek community.

As part of the commitment to sustainable construction practices, PTPP applies the Hydroseeding method for the revegement of dam areas. This method is considered more efficient and effective than traditional planting methods, especially on tilted land such as dam areas.

Hydroseeding's advantages include:

Strengthening slopes to prevent erosion, stay wide coverage efficiency with fast and equitable planting, Good quality vegetation is better than manual methods, good luck With significant erosion reduction on the surface of the slope.

The types of plants used are Legume Cover Crops (LCC) such as Centrosema Pubescens, Coloponium Mucunoides, and Pueraria Javanica which are able to bind nitrogen while strengthening soil structures that can reduce erosion on slope surfaces significantly or reduce erosion.

"Hydroseeding is proof that we are not only focusing on the physical completion of the project, but also ensuring the sustainability of the environment and long-term benefits for the community," said Joko Raharjo, PTPP's Corporate Secretary, in his statement, Wednesday, September 3.

The application of technological innovations such as Hydroseeding confirms the position of PTPP as a pioneer of sustainable construction in Indonesia. This project is not only a timely completion target, but also presents a wide beneficial green legacy infrastructure.

"With the completion of this project at the end of 2025, the Bagong Dam will be a role model for the construction of modern dams that are innovative, environmentally friendly, and bring prosperity to the people of Trenggalek and its surroundings, as well as prove PTPP's commitment to carrying out sustainable construction practices," concluded Joko.