Knight Piésold specializes in renewable energy
development, from resource assessment,
concept development, and detailed engineering
to dam safety review and refurbishment.
Your Dam and
Run-of-River | Pumped Storage | Water Storage
Flood Control | Transmission Lines & Substations
Visit us at
HydroVision International 2017
http://hydroreview.hotims.com RS #25 Proud NHA Member
32 HYDRO REVIEW / June 2017 www.hydroworld.com
called for modifying the existing headworks, constructing a new
pipeline, modifying the existing surge tank and constructing a new
powerhouse. JPS expressed its preference that the pipeline be replaced
with a fberglass–reinforced-plastic (GRP) pipe because of its minimal
maintenance requirements. Basic and detailed design of the facilities
would be performed by an engineering, procurement and construction
As the frst signifcant hydropower project development in Jamaica
in decades, JPS encountered not only the technical challenges inherent
in a major energy project but signifcant scrutiny on the part of the
press and the public. JPS also had stringent environmental standards
to adhere to during the construction phase of the work.
Te existing approximately 11 m long by 5 m wide intake, located
just upstream of the weir on the left bank, was sized for the old hydro
development and would not be adequate to provide sufcient fow
for the combination of the old and the new hydropower plants. Also,
the right bank rises steeply, which would have made an extension of
the existing intake challenging, requiring extensive excavation and
To address this problem, MWH planned installation of a new
intake similar to the existing one but just downstream of the weir,
along with removal of a small portion of the weir to make room for
the new intake, which is about 16 m long and 6 m wide. To maintain
the weir (spillway) capacity, a section of new weir was required near
the face of the new intake.
As with many small hydro developments, the initial (capital) cost
presented a challenge.
To enhance the cost-efectiveness of the project, MWH suggested
the following measures involving reuse of existing components:
• Use of a Wye connection to link the two intakes and utilize a
Prior to its expansion, this was the existing Maggotty Falls weir on the
Black River in the parish of St. Elizabeth in western Jamaica.