Water Management System Stops Contaminated Water Entering River During Reservoir Restoration Project
Project Overview
This project was based at a reservoir capable of storing 1,040 acre-fee. The Dam’s auxiliary spillway had suffered a serious incident after almost a week of intense rainfall, which had an estimated annual exceedance of 1% (i.e. a return period of 100 years). As a result, a £15 million restoration project was needed.
Challenge
A top tier contractor was asked to carry out permanent repairs which involved the construction of a new side channel weir, ‘tumble bay’, spillway channel and stilling basin. The damaged auxiliary spillway would be removed, the dam repaired and the slope grassed over. For this to be completed, a number of excavations and piling works had to be undertaken. The excavations would require dewatering due to the high water table on site and also a water management system was required for surface water runoff to prevent contaminated runoff water from entering the nearby river.
Solution
Given the importance of the Dam, and the sensitive nature of the surrounding site environment, RVT had to move quickly and get the right solution in place. RVT promptly attended site, took and analysed water samples and combined the sample information with the geological nature of the ground. As a result, RVT proposed a complete EnviroHub chemical dosing water management system. This included EnviroHub TU02 Dosing Skid, EnviroHub TT10 Treatment Tank and EnviroHub HL50 Lamella Plate Settlement Tank. The EnviroHub system was able to achieve a particulate removal rate of around 95%. The system accomplished this by the neutralisation of colloidal (fine/clay) particles, allowing them to agglomerate together forming heavier flocs, which then easily settle out in our EnviroHub Lamella Tanks.
Furthermore, our real-time EnviroHub Monitoring Unit would generate automatic text and email alerts to warn the site team when the system was approaching the set compliance limits. This made the system really easy for the site team to manage and enabled the site manager to rest assured that they would always remain compliant with their environmental water discharge permit.
Contact RVT Group
This case study was produced and originally issued by RVT Group - construction industry partners for EnviroHub. To contact them directly, please call 0808 178 3286 (7:30am to 4:30pm Mon-Fri).
