St. Catherine WS Pplan – October 12 2011
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1 Draft St. Catherine WS PPLan – October 12 2011 1.0 Introduction St. Catherine is located in the south-eastern section of Jamaica. Its western boundary is with the parish of Clarendon. The eastern boundary follows part of the Ferry River as well as borders with St. Mary and St. Andrew. The northern boundary is with St. Ann and St. Mary. The Caribbean Sea borders St. Catherine to the south. National Water Commission (NWC) produces over 1 billion gallons of water per month in St. Catherine through thirty – four (34) wells and five (5) surface sources. The average billed volume is only 300 million gallons per month which translates to an average non-revenue water (NRW) of 700 million gallons per month i.e. 70% of production. This unacceptable level of NRW has had an adverse impact on the level of service provided to the people of the parish and on its financial performance and that of NWC. NWC now provides water to some 90% of the population in St. Catherine. However, the reliability of service to those who are served by NWC is estimated to average 16 hours per day. A Water Supply Improvement plan has been prepared for the parish and is presented in this document. The WSIP for the parish will involve an expenditure of $5,290,917,230.40 over the next twenty years in carrying out a number of water supply rehabilitation and upgrading works. A substantial portion of the proposed works is aimed at addressing the unacceptable level of NRW through the replacement of major sections of the aged and undersized water supply infrastructure and improvement in water supply pressure management. It is planned to increase service reliability to 90% to the parish population by end 2030. 2 Draft St. Catherine WS PPLan – October 12 2011 2.0 Existing Water Supply System 2.1 Water Resource Surface Water Some 7% of the water abstracted in the parish is obtained from surface sources. The following are the main surface sources in the parish: Rio Cobre Rio Pedro Mango Gully Indian River Rio Doro Fresh to brackish water may be sourced from: Fresh River Salt Island Lagoon Salt Island Creek Colburns Gully Ground Water Karstified limestone and alluvial aquifers may be tapped into for groundwater. The areas identified as most appropriate for groundwater exploration is in central and northern sections of the parish. 2.2 Water Supply Systems An extensive network of some 34 production wells as well as treatment plants supply the St. Catherine region with potable water. The supply systems and their sources are as follows: • Spanish Town and its immediate environs are supplied with drinking water from a system consisting of some ten (10) production wells and a water treatment plant. The supply sources have a combined estimated average daily output of 11.7 mig; • Portmore is fed on average 5.1 migd of potable water from some 13 production wells; 3 Draft St. Catherine WS PPLan – October 12 2011 • The Linstead/ Ewarton/ Bog Walk water supply system consists of six (6) wells which supplies the region with an estimated daily average of 6.7 mig of potable water. The system may be supplemented with water from the Bybrook No. 3 Well which primarily supplies the Rio Cobre System; • The Old Harbour water supply system is supplied from three (3) well sources. These four production wells have an estimated daily output of 2.5 MIG. • The Rio Cobre system, originally designed to produce 13.5 MIG of potable water on a daily basis has the following raw water supply sources: o Tulloch Spring o Bybrook Well 1, 2 & 4 o Eastern Headwork’s Well H, W & G The Rio Cobre Water Supply System supplies sections of Kingston and St. Andrew, Spanish Town as well as Portmore with potable water. The Kingston Metropolitan Area (KMA) Water Supply Project was undertaken jointly by the JBIC and GOJ aimed at improving all the existing water systems in the Greater Spanish Town, South East St. Catherine and ultimately increasing the production capacity in the parish. The water supply network throughout the parish is aged and undersized, contributing to unacceptable level of service there. Information on the water supply network is summarized in table 2.1 below. Figure 2.1 – St. Catherine Water Supply 4 Draft St. Catherine WS PPLan – October 12 2011 Table 2.1 – Summary Information on St. Catherine Pipe Network Pipe Approximate Percentage Diameter Length of the (inches) Network < 2 15,287 1 2 179,677 15 4 587,606 51 6 160,220 14 8 88,246 8 10 28,230 2 12 36,445 3 5 Draft St. Catherine WS PPLan – October 12 2011 >12 65,550 6 Total 1,161,261 3.0 NON-REVENUE WATER LEVELS Set out in figure 3.1 is the annual water balance for St. Catherine. This was derived from the water balances that were prepared for each of the water supply systems in the parish. The water balances are based on flow measurements that were conducted at sections of the water supply network and examinations of customer and records. NWC water production facilities provide approximately 54.26 M cubic meters of water per year to the water supply network in St. Catherine i.e. 11,937.2 M gallons per year. Physical losses amount to 29.5 M cubic meters (6,490M gallons) per year. This represents 54% of the amount produced. Revenue water in the parish is only 10MGD which is only 32% of the water produced. It should be noted that over 22,000 accounts attributes to unauthorized consumption. This is largely due to illegal connections to some of the cross country transmission pipelines to obtain water for irrigation. Figure 3.1 – Water Balance for St. Catherine 6 Draft St. Catherine WS PPLan – October 12 2011 7 Draft St. Catherine WS PPLan – October 12 2011 4.0 Water Requirement 4.1 Parish Population General In 2001 the population in St. Catherine was 482,308, which was a 2.63% increase over the 381,974 in 1991. Based on an annual population growth rate of 2.63%, it is estimated that the population in the parish in 2010 is 594,952 persons. There were 134,378 households in 2001 of which 74,686 had piped water (56%). There are now 101,433 customer accounts of which some 97,200 are domestic accounts. Based on this information, it is estimated there was a 30% increase in the number of dwellings with piped since 2001, an average annual increase of 3%. It is estimated that 85% of the population of the parish now has piped water population data for systems. Demand Centres The enumeration districts (EDs) that were used in the 2001 population census was used to establish priority areas that will be targeted to be provided with water supply. EDs with population densities in excess of 150 persons per square kilometres were grouped to form these demand centres. Figure 4.1 – Demand Centres 8 Draft St. Catherine WS PPLan – October 12 2011 Pipeline TYPES OF DATA Subdivision Enumeration District (ED) - Population Data WATER DEMAND CENTRES Light Blue Shaded EDs Pump -Pop > 150p/sq Km Station -Priority given to fully supply As far as possible, each demand centre (DC) is linked to a water supply system. It is related to a water distribution system that now serves it or has the potential to serve by it. Set out in table 4.1 is information showing the population in the major towns, indicating estimates for 2010, 2015, 2030. Parish Urban Population & 1991 2001 2005 2010 2015 2020 2025 2030 Main Towns St. Catherine Spanish Town 115025 131515 140637 148367 158646 169637 179783 189410 Portmore and Greater Portmore 99911 156469 166845 171555 180556 190029 200000 210493 Linstead 15171 15660 15859 16112 16370 16632 16898 17168 Old Harbour 17966 23823 31685 78577 136729 146300 156540 167498 Old Harbour Bay 5591 6344 8374 17502 18972 20565 22292 24165 Bog Walk 9043 11241 12263 13672 14830 15771 16691 17664 Ewarton 9097 10807 11577 12619 13485 14340 15250 16217 Total 271804 355859 387240 458404 539588 573274 607454 642615 9 Draft St. Catherine WS PPLan – October 12 2011 The estimated total 2010 population within the major towns is shown to be 458,404 (77% of parish population) 4.2 Current Water Requirement Base Technical 2010 Supply Demand Losses Deficit/Surplus St. Catherine Spanish Town 148,606 11,759,274 6,687,284 3,513,339 4,720,651 Portmore & Greater Portmore 172,114 13,734,198 7,745,117 4,944,311 1,044,770 Goldmine 20,017 221,554 900,766 79,759 (758,971) Old Harbour 99,541 3,624,152 4,479,354 1,304,695 (2,159,897) Ewarton 60,605 5,448,844 2,727,217 3,516,718 (795,091) Sligoville 3,774 600,000 169,826 216,000 214,174 Guys Hill 15,003 184,128 675,134 66,286 (557,292) Sue River 3,455 210,511 155,458 75,784 (20,731) 12,161,758 TOTAL 523,115 33,782,661 23,540,156 The current water supply situation in St. Catherine is that, overall, there is sufficient water in the parish to meet the water requirement, even with the existing technical losses (leaks, tank overflows, etc). The average daily water production in the parish is 34 million gallons of which 3 million gallons is exported to the Kingston Metropolitan area; the average day water consumption (domestic, commercial, institutional, etc), which is based on 90% supply coverage, is estimated to be 24 million gallons and the technical water losses is estimated to be 20 million gallons per day.