algal growth is caused by phosphates

current dissolved P in lake causes high algal growth

phosphates provide clean clothes

phosphates cause pollution in urban run off and sewage effluent

phosphates provide good plant growth in agriculture

agriculture causes high phosphate erosion rates to river

long-term phosphate loading from river caused high phosphate content sediment

high algal growth causes reduced oxygen in bottom of lake

reduced oxygen causes high reduction potential in sediment

reduction potential causes high release rate of phosphorous from sediment

high release rate of phosphorous greatly increases P available for algal growth

These can be expressed as linked events from which problem statements can be drawn, (a TRIZ software package did the drawing).

The related problem statements from the linked statements as formulated by the software.

1. Find a way to eliminate, reduce or prevent (dissolved Phosphates), under the condition of (high P release).

2. Find a way to benefit from (dissolved Phosphates).

3. Find a way to eliminate, reduce or prevent (algal growth), under the condition of (dissolved Phosphates).

4. Find a way to benefit from (algal growth).

5. Find an alternative way to provide (Phosphates used in laundry), which provides or enhances (clean clothes), and doesn't cause (urban pollution) and (Sewage effluent).

6. Find a way to enhance (Phosphates used in laundry).

7. Find a way to resolve CONTRADICTION: (Phosphates used in laundry) should be for providing (clean clothes), and should not be for not causing (urban pollution) and (Sewage effluent).

8. Find an alternative way to provide (clean clothes), which doesn't require (Phosphates used in laundry).

9. Find a way to enhance (clean clothes).

10. Find a way to eliminate, reduce or prevent (urban pollution), under the condition of (Phosphates used in laundry).

11. Find a way to benefit from (urban pollution).

12. Find a way to eliminate, reduce or prevent (Sewage effluent), under the condition of (Phosphates used in laundry).

13. Find a way to benefit from (Sewage effluent).

14. Find an alternative way to provide (Phosphates used in agriculture), which provides or enhances (good plant growth), and doesn't cause (high pollution of River).

15. Find a way to enhance (Phosphates used in agriculture).

16. Find a way to resolve CONTRADICTION: (Phosphates used in agriculture) should be for providing (good plant growth), and should not be for not causing (high pollution of River).

17. Find an alternative way to provide (good plant growth), which doesn't require (Phosphates used in agriculture).

18. Find a way to enhance (good plant growth).

19. Find a way to eliminate, reduce or prevent (high pollution of River), under the condition of (urban pollution) and (Phosphates used in agriculture).

20. Find a way to benefit from (high pollution of River).

21. Find a way to eliminate, reduce or prevent (high content P sediment), under the condition of (high pollution of River).

22. Find a way to benefit from (high content P sediment).

23. Find a way to eliminate, reduce or prevent (reduces oxygen at bottom of lake), under the condition of (algal growth).

24. Find a way to benefit from (reduces oxygen at bottom of lake).

25. Find a way to eliminate, reduce or prevent (high reduction potential in sediment), under the condition of (reduces oxygen at bottom of lake).

26. Find a way to benefit from (high reduction potential in sediment).

27. Find a way to eliminate, reduce or prevent (high P release), under the condition of (high content P sediment) and (high reduction potential in sediment).

28. Find a way to benefit from (high P release).

I think there are some interesting ideas which were generated by the computer from the information you sent me.