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Dan is certainly right, this is a favored technology when talk moves to TMDL. Uhhmmmm, question for those who've designed porous parking... Do you end up with all the parking lot porous, or only the parking spaces, or only some of the spaces, or part of all the spaces, or part of some of the...

Question for danbalfour, but anyone else too...I just noticed this thread happened in March...anybody still out there? The one acre pond, at 2.5 feet avg. depth (not real deep), can hold/detain, about 100,000 cubic feet water. If I get about 35% porosity in the stone subbase and 25% in the...

So...would, or could, whitish porous concrete meet the LEED standard? The porous concrete parking lots I've seen in my area have all been a fairly whitish gray color, and with white coloring could have been made whiter. I have another question for Dan I'll do another post...

****** If we are looking for the one-hr unit hydrograph (i.e., the runoff pattern resulting from one inch per hour of rain for one hour)...then we are looking for the discharge rates at one hour, two hours, three hours, four hours, etc. let's assign the ordinates of a unit (1 inch of direct...

If you mean 1.1 inches/hr for two hours, then the answer is... 1st hr rainfall hydrograph, at time 2 hr = 1.2*1.1 cfs plus 2nd hr rainfall hydrograph, after 1 hour = 0.5*1.1 cfs 1.2*1.1 + 0.5*1.1 = 1.87 cfs. If you mean 1.1 inches over two hour period, then then answer would be 0.55*0.5...

For a visual of the 1.5 in/hr runoff hydrograph + the 0.7 in/hr hydrograph...well, maybe not, I can't seem to paste a graph in here. Maybe I can attach one...looks as if I can, wonder if you can see this graph. Anyway... Is there some best way to solve this? I set up four equations in four...