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Drought Index For Rarotonga

Drought Index For Rarotonga. Rarotonga Water Supply. Impact of drought on Rarotonga water supply. Temporary measures. By-passes upstream of water intakes are formed to harvest available water in the streams. Managing Drought. Water use monitoring Trap more water Roof catchment

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Drought Index For Rarotonga

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  1. Drought Index For Rarotonga

  2. Rarotonga Water Supply

  3. Impact of drought on Rarotonga water supply

  4. Temporary measures By-passes upstream of water intakes are formed to harvest available water in the streams

  5. Managing Drought • Water use monitoring • Trap more water • Roof catchment • Water Restriction • Water Conservation • Restriction of non essential uses • Monitoring/Predicting Drought

  6. Measuring Drought To manage drought we need to measure it Precipitation based • Standardized Precipitation Index (SPI) • Weighted Sum Precipitation Index

  7. Standardised Precipitation Index

  8. Weighted Sum Index Uses a time window with increasing weight given to most recent rain (a measure of catchment memory)

  9. Hydrological Network – NZODA

  10. Hydrological Data

  11. Drought Forecast Long term rainfall forecast allows a forecast of drought persistence

  12. Experimental Rainfall Prediction Rarotonga: Most recent forecast Rarotonga: September 1996

  13. Useable drought forecasts: • Understanding of the meaning of long-term rainfall forecasts • Understanding of relationship between rainfall & catchment yield • Drought response plan

  14. Conclusion • A drought index provides basis for management decisions • A reliable drought forecast would make it possible to make an earlier decision and the response will be more effective • The simple drought index “Weighted Sum” is a first step in measuring drought, this will be adapted as we gain experience and more data

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