integrated strategic development framework

Integrated Strategic Development FrameworkKNYSNA | STATUS QUO | OCTOBER 2013

CIVIL SERVICES, ROADS AND TRANSPORTATION

KNYSNA | INTEGRATED STRATEGIC DEVELOPMENT FRAMEWORK | OCTOBER 2013 1

Integrated Strategic Development FrameworkKNYSNA | STATUS QUO | OCTOBER 2013

CIVIL SERVICES

CONTENTS

•WATER INFRASTRUCTURE

•SEWER INFRASTRUCTURE

•ROAD INFRASTRUCTURE

•STORMWATER INFRASTRUCTURE

•TRANSPORTATION

•SOLID WASTE

2KNYSNA | INTEGRATED STRATEGIC DEVELOPMENT FRAMEWORK | OCTOBER 2013

WATER INFRASTRUCTURE

KNYSNA TOWNWater Sources Knysna River(65%), Gouna River(17%) , Bigai Springs, Glebe

Dam(10%), Akkerkloof Dam, Boreholes

Treatment Infrastructure Knysna Water Treatment Works and Reverse Osmosis Plant

Treatment Capacity 23.25 Ml/day

Current Demand Avg/Peak(Dec) 10/15 Ml/day 3650 Ml/a

Future Demand Avg/Peak(Dec) 15/23 Ml/day 5475 Ml/a

Storage 32.515 Ml in 41 Reservoirs/Tanks

• The assured yield (98%) of the main raw water sources is estimated at 4489 Ml/a.

• The permitted abstraction (Knysna/Gouna Rivers) are 4740 Ml/annum

• The graphical information of the future treated water demand indicate that the demand will exceed the assured yield in approximately 2017-2018, based on a 3% growth.

• Water losses are estimated at 14.4%, 4% down from the previous year.



PROBLEMS IDENTIFIED

• The above dictates that future water sources will be largely dependant on the augmentation of the existing sources (dams) and possibly desalination plants.

• The bulk distribution and storage system is adequate for the existing status quo, but do not have the capacity to deal with the full occupation of existing developments and future developments.

• Bulk supply routes to Old Place Lower, Dam se Bos, Thessen Hill and Leisure Isle have insufficient capacity.

• Insufficient storage zones identified was Eastford Lower, Concordia East, Heuwelkruin Lower, Thessen Hill, Bongani, Dam se Bos, Old Place Low Level, Corlet Drive and The Heads.

• The Akkerkloof Dam only holds enough water to supply the town with water for 30 days. The recommended minimum is 60 days


KNYSNA-BELVIDERE-BRENTON WATER INFRASTRUCTURE



SEDGEFIELDWater Sources Karatara River(57%), Desalination Plant(42%) , Boreholes

Treatment Infrastructure Sedgefield Water Treatment Works Desalination Plant

Treatment Capacity 4.0 Ml/day 1.5 Ml/d

Current Demand Avg/Peak(Dec) 2/3 Ml/day 730/1095 Ml/a

Future Demand Avg/Peak(Dec) 4.26 Ml/day 1555Ml/a

Storage 4.0 Ml in 3 Reservoirs

• The permitted abstraction (Karatara River) are 740 Ml/a,

• The assured yield of river is calculated at 340 Ml/a.

PROBLEMS IDENTIFIED

• The figures indicate that Sedgefield have a water supply problem and cannot cope with any major development at present or growth.

• The bulk distribution and storage system is adequate for the existing status quo, but do not have the capacity to deal with the full occupation of existing developments and future developments.

• The main town zone has insufficient storage.


SEDGEFIELD WATER INFRASTRUCTURE



KARATARAWater Sources Karatara River

Treatment Infrastructure Karatara Water Treatment Works


Current Demand Avg/Peak(Dec) 0.2 Ml/day max 73 Ml/a

Future Demand Avg/Peak(Dec) 0.323 Ml/day 117.9 Ml/a


• The current abstraction from the Karatara River is 81Ml/a.

• The Treatment Works and storage provide adequately for the demand.

• Water is pumped out of the Karatara River and stored in an off-channel dam.

• The assured yield of the Karatara River is sufficient to supply the village onwards but may be affected by future developments in the area.

PROBLEMS IDENTIFIED

• The 5km bulk supply line is in a poor condition and requires complete replacement.


WATER INFRASTRUCTUREKARATARA



BUFFALO BAYWater Sources Goukamma River

Treatment Infrastructure Buffalo Bay Water Treatment Works


Current Demand Avg/Peak(Dec) 0.1/0.5 Ml/day 36.5 Ml/a


•The current abstraction from the Karatara River is 41 Ml/a.

•The Treatment Works and storage provide adequately for the normal demand but cannot cope with the seasonal peak.

•In lieu of the fact that the village is hemmed in by nature reserves, no major developments are foreseen, hence no future demands are indicated.


BUFFALO BAY WATER INFRASTRUCTURE



RHEENENDALWater Sources Homtini River

Treatment Infrastructure Keurhoek Water Treatment Works


Current Demand Avg/Peak(Dec) 0.2/0.28 Ml/day max 73 Ml/a

Future Demand Avg/Peak(Dec) 0.41 Ml/day 149.65 Ml/a

Storage 0.4 Ml in 1 Reservoir and 1 Tower

•The assured yield of the Homtini River is sufficient for the village.

•No storage facility for raw water is in place and off-channel storage and associated increase in pumping capacity be provided to ensure the security of the supply for further development.

PROBLEMS IDENTIFIED

•The bulk distribution and storage system is adequate for the existing status quo, but does not allow for growth and as such raw water sources will need to be investigated.

•The entire town has insufficient reservoir storage.


RHEENENDAL WATER INFRASTRUCTURE



BRENTONWater Sources Boreholes and Knysna WTW

Treatment Infrastructure Nil

Treatment Capacity Nil

Current Demand Avg/Peak(Dec) 0.4/0.6 Ml/day

Future Demand Avg/Peak(Dec) 0.6/0.9 Ml/day


•The current water demand is 146 Ml/annum.

•Water is obtained from boreholes, with the Knysna WTW as supplementary source when required.

PROBLEMS IDENTIFIED

•It must be noted that any substantial developments that require water will have a major impact on the total water use figures as the areas are relatively small.


BRENTON WATER INFRASTRUCTURE



BELVIDEREWater Sources Boreholes and Knysna WTW

Treatment Infrastructure -

Treatment Capacity -

Current Demand Avg/Peak(Dec) 0.3/0.45 Ml/day

Future Demand Avg/Peak(Dec) 0.45/0.7 Ml/day

Storage -

•The current water demand is 110 Ml/annum.

•Water is obtained from boreholes, with the Knysna WTW as supplementary source when required.


BELVIDERE WATER INFRASTRUCTURE


WASTE WATER INFRASTRUCTURE

KNYSNA TOWNDrainage Zones System is subdivided in 16 zones, all draining towards the

Knysna Waste Water Treatment Plant (WWTW) via a network of collector sewers and rising mains

Treatment Infrastructure Activated Sludge Plant and SBR Plant

Treatment Capacity 8.2 Ml/day PDWF = 7.8 Ml/day

Pump stations 44

• The Plant was recently upgraded and was reported as being functional to 2020.

• Allowing for proposed developments, the ultimate treatment capacity must be in the order of 13-15 Ml/d

• Investigations are currently in process finding a suitable location for a new Treatment Works.

PROBLEMS IDENTIFIED

• Some sections in the reticulation was identified with insufficient capacity for the generated flows.

• The topography dictates numerous pump stations. The maintenance thereof are problematic and costly


WASTE WATER INFRASTRUCTUREKNYSNA



SEDGEFIELDDrainage Zones System is subdivided in 5 zones, all draining towards the

Knysna Waste Water Treatment Plant (WWTW) via a network of collector sewers and rising mains

Treatment Infrastructure Activated Sludge Plant and Conservancy Tanks


Pump stations 17

• The estimated current average dry weather flow is within the capacity of the Works.

• Approximately 1220 out of a possible 3200 erven is connected to the sewerage network, the balance are on conservancy tanks.

• If the total area is reticulated, the ultimate treatment capacity should be 3-4 Ml/d, and previous recommendations was to extend the plant immediately to 2 Ml/d.

• Upgrading proposals was tabled, Phase 1 being the upgrading of the existing works.

• Final effluent is discharged into a infiltration pond west of the works.



PROBLEMS IDENTIFIED

• As mentioned, the Works is sufficient for the average daily flows, but cannot handle the peak flows required. This are compounded when additional waste from the conservancy tanks are deposited by tankers.

• The current configuration of the Works do not meet the Special Limits Values required for the final effluent. The quality of the effluent is a concern to DWA due to potential groundwater contamination.

• Pump stations and the maintenance thereof are problematic and costly


WASTE WATER INFRASTRUCTURESEDGEFIELD



KARATARADrainage Zones Welsynsdorp (123 houses) are fully serviced. Bergvallei and Bosdorp

are not connected to the sewer system

Treatment Infrastructure Activated Sludge Plant and Conservancy Tanks


Pump stations 2

• The Works are operating below its capacity, but it was noted that capacity problems was encountered during wet conditions.

• Potential developments (340 erven) will increase the PDDWF to 0.38 Ml/d which will affect the effectiveness of the plant.

• The Conditional Assessment report (2010) states the infrastructure as good.

PROBLEMS IDENTIFIED

• The Master Plan (2008) states the rising mains to the treatment works as overloaded.



RHEENENDALDrainage Zones Two zones exist, both pumping to the Treatment works

Treatment Infrastructure Activated Sludge Plant


Pump stations 2

• The total required future capacity required is in the order of 0.35 Ml/day, subject to further developments.

• Effluent is discharged into the surrounding streams.

• The Conditional Assessment report (2010) states the infrastructure in the good to excellent category.

PROBLEMS IDENTIFIED

• The current configuration of the Works do not meet the Special Limits Values required for the final effluent. The Plant’s inability to remove nitrates will make it difficult to attain Green Drop status


WASTE WATER INFRASTRUCTUREKARATARA AND RHEENENDAL



BRENTONDrainage Zones Three zones exist, all pumping to the Treatment works

Treatment Infrastructure Hybrid STP


Pump stations 3

• The Sewer Master Plan (2008) records the development of a further 173 stands, which will result in a long term PDDWF of 0.329 Ml/d, still within the existing plants capacity.

• Effluent is discharged into the sea.

• The Conditional Assessment report (2010) states the infrastructure as varied, with some of the electrical components as poor.

• Brenton on Lake have septic and holding tanks

PROBLEMS IDENTIFIED

• The current configuration of the Works do not meet the Special Limits Values required for the final effluent. The Plant’s inability to remove nitrates will make it difficult to attain Green Drop status


WASTE WATER INFRASTRUCTUREBRENTON



BELVIDEREDrainage Zones Three zones exist, all pumping to the Treatment works

Treatment Infrastructure Beacon Watertec STP


Pump stations 3

• The average future flow is estimated at 0.2Ml/d, peaking at 0.35-0.4 Ml/d which will exceed the existing capacity of the plant.

• Effluent is discharged into a artificial pond in Belvidere Estate.

• The Conditional Assessment report (2010) states the infrastructure as good to fair.

• Sections of reticulation have 0% capacity or in the 0-30% category capacity and cognisance to be taken thereof for future development in the area.

BUFFALO BAY

• Currently serviced by septic and conservancy tanks only.

• A new Treatment Works is foreseen in the medium term and should have a capacity of 0.2 Ml/d


WASTE WATER INFRASTRUCTUREBELVIDERE


integrated strategic development framework

Documents

water losses

brenton water infrastructure

future water sources

water supply problem

major development

future treated water

main raw water sources

future developments