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RESERVOIRS AND DAMS
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Hollis Reservoir
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OVERVIEW
The Water And Sewerage Authority is pleased to welcome you to Hollis Reservoir.
The way to the Hollis Reservoir leads from the crowded East-West corridor, through the quiet pasturelands of Wallerfield and Aripo, beyond the crossroads at Valencia, and through a winding roadway to the hills. The final passage is fringed with ferns and trees and there is just the slightest whisper of water from the river that flows, out of sight, but somehow close by.
When the treatment works are approached on the Hollis compound there is still no sign of water. Only when one enters and ascends to the last elevations, is the sea of water discovered, barely lapping the edge of the face of the dam.
The dam site is edged with towering firs carpeted with soft grass that thrives because of the abundant supply of water. Yet the reservoir has, a strange untouched beauty as if all the man-made confusion of blocking river courses and the business of concrete dams pipelines, has not distributed the original charm of the quiet mountains and the hushed gurgling of the mountain streams. 'Hollis', the oldest man-made water source in Trinidad and Tobago, is by far the loveliest.
The reservoir reaches its maximum depth at 20 metres (65 feet) and a safety spillway is provided to prevent the water from topping the dam crest. The reservoir has an appropriate capacity of 4,750,000 cubic metres (1050 million gallons) and sustains an average daily output of 32000 cubic metres (70 mgd)
HISTORY
The dam is the oldest in Trinidad, built under the authorization of Sir Claude Hollis, a past Governor of Trinidad and Tobago. The beauty of the dam sites bespeaks another era, when there was time and labour to fashion the most functional of services with an eye for beauty and appealing design.
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WATER TREATMENT
The treatment of the water from the Hollis reservoir is simple and compact. Water is filtered of fine sediments and the addition of chemicals causes the sediments that the water carries to join together into bigger and heavier particles. As these particles are carried with the water to the filter bed, they are easily strained out.
The water leaving the filters is injected with chlorine to destroy any disease-causing bacteria, as well as to provide a disinfecting agent for any contamination that may occur along the way. The Hollis Dam with its reservoir is comparatively small and very secluded, yet its trunk main has carried water to almost every part of Trinidad during its long existence.
Though few people may find the way that leads to the quiet splendour of the 'sea among the hills', the benefits of that water source, at one time or another have been enjoyed by thousands of people in widely ranging areas throughout Trinidad.
LOCATION
The hills that shelter the Valencia Valley
DAILY OUTPUT
38,181 cubic meters (M3/D)
COMPLETION DATE
1936
AREAS BENEFITING
Arima, Nettoville, Cleaver Road, Bregon Park, D' Abadie
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View Hollis Capacity (Recent)
View Hollis Capacity (Historical)
View Hollis Rainfall Data
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