HomeMy WebLinkAboutREINHOLTZ / FORNEY PUD - PRELIMINARY & FINAL - 61-87 - SUBMITTAL DOCUMENTS - ROUND 1 - STORMWATER-RELATED DOCUMENTS/
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STORM WATER DRAINAGE ANALYSIS .
Reinholte-Forney PUD
September 28, 1987
Attention: Ms..Kari VanMeter, Senior Planner
We have reviewed the above referenced project in relation to
the proposed PUD and its subsequent storm water drainage
impact. As currently proposed, the storm water drainage from
this PUD will decrease from the existing conditions because
of the following:
a> Approximately 3,900 SF of the existing buildings
and canopies will be removed and replaced with turf. This
represents an approximate 53% reduction in building roof
runoff contribution with a composite runoff coefficient of
0.95 versus an increase of 12% in turfed areas with a runoff
coefficient of 0.20, or in relative conparison:
3,900 (0.95) - 3,900 (0.20) = 3,900 (0.75)
= 2,925 ,weighted, SF _
decrease
b) Proposed driveway changes and parking
approximately balance, so no significant increase or
decrease results.
c) Comparing the site overall:
Existing Proposed
--------------------------------------- ___-___-_______-_____
Roof Areas 7375 SF 3475 SF
Drive/Walks 6050 SF 6050 SF
Turf/Landscaping 32775 SF 36675 SF
Therefore, in comparison, using areas x coefficients:
Existing 7375 (0.95) 7006
6050 (0.95) / 5748
32775 (0,20) 6555
19309
Proposed 3475 (i � . 95) 3301
6050 (0.95) 5748
36675 (0.20) 7335
i'iel-Z'
Therefore, the composite runoff decrease is 15%
(existing/proposed) of relatively impervious surfaces.
In view of the foregoing, no on -site storm water detention
will be required.
If you have any additional questions or comments, please
cal 1 .
Signed:
Richard S. Beardmore.
President/Owner
RSB/jdr
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