quality constituents. These fluxes 

 are evaluated for the proposed urban 

 development, and nutrient loadings 

 to the lakes determined. The study 

 indicates good surface water quality 

 in the proposed Unit 24 and Unit 30 

 lakes as evaluated from the loadings 

 and physical characteristics. Of 

 special interest is the presence of 

 a mixolimnion and monimolimnion in 

 the lakes separated by a chemocline 

 exhibiting very strong density 

 stratification. 



Restoration of freshwater in- 

 puts to estuarine wetlands impacted 

 by prior construction of roads and 

 drainage works is accomplished by 

 blocking all present channelized 

 flows. Fresh surface water from the 

 proposed real estate lakes will 

 overflow to spreader waterways and 

 then migrate via sheet flow across 

 preservation wetlands to the estu- 

 ary. The system design incorpo- 

 rates management f lexibility--all 

 lakes are interconnected — and sheet 

 flow discharge can be routed via ad- 

 justable weirs to particular adja- 

 cent fringing wetlands that can be 

 improved by increasing freshwater 

 inflow. 



DISCUSSION 



Question : Pete Rosendall, 

 Everglades National Park, directed 

 to Dr. Huber. My question concerns 

 the water quality analysis on the 

 outflow from the proposed area. 

 You settled on N and P as a way to 

 address the question of the water 

 quality in the adjacent area. I was 

 wondering what sort of consideration 

 is given to other parameters such as 

 contaminants that aren't nutrients, 

 and what control would the developer 

 have over inputs from a residential 

 area, such as somebody changing the 

 oil in their car and pouring it in 



your lake? I don't see the bene- 

 ficial effect of other than the 

 nutrient outflow. The second part 

 of my question is--approaching 

 the problem from a nutrient balance, 

 what's the difference of the nu- 

 trient output between the one calcu- 

 lated and the one that is currently 

 occurring from this area? Is there 

 a net increase and decrease in N and 

 P on the proposed project? 



Answer : In terms of other pa- 

 rameters, that would enter the lake 

 there is a whole laundry list of 

 things that could come in. We did 

 investigate some, for instance, 

 dissolved oxygen which we don't 

 anticipate to be a problem. 

 Bacteria we don't anticipate to be 

 a problem. Other things, such as 

 oil and grease, pesticides, herbi- 

 cides, metals, and other things that 

 we would not like to see in the 

 lakes will be contained in the urban 

 runoff because they've been measured 

 in many different places. The con- 

 trol on those is for all of the resi- 

 dential street and commercial de- 

 velopment to be passed through 

 swales. There will not be any pipes 

 running into the development. So 

 hopefully the soil system, the vege- 

 tation system and so forth will act 

 as a filter for many of these things. 

 In other developments, the use of 

 certain pesticides and herbicides 

 has been prohibited either by law 

 or at least the developer has been 

 prohibited from using them, so there 

 is some restriction on these. There 

 will also be a littoral zone on the 

 lake. The lakes will all be estab- 

 lished with a five to one slope, 

 that is, one vertical and five hori- 

 zontal, with vegetation and so forth 

 to act as filters. The main control 

 is to try to keep the pollutants out 

 in the first place. The other ques- 

 tion you asked concerning the nu- 

 trients N and P will be less in the 

 new development than they are now. 



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