Millers Rainwater Project

Millers Rainwater ProjectBriarcliff Raingarden

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Plymouth Pond

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5/13/10 12:00 AM 5/13/10 4:48 AM 5/13/10 9:36 AM 5/13/10 2:24 PM 5/13/10 7:12 PM 5/14/10 12:00 AM

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2010

Total Rain: 0.62 inches in 2 hours prior to highest flow

0.97 inches total of rain received on May 11-May 13.

2003 Total Rain: 0.6 inches in 2 hours prior to highest flow

1 inches total of rain received on April 4

Prior moisture conditions: In 2003, off and on rains occurred throughout the day of the storm. In 2010, off and on rain occurred throughout 2 days prior to the storm. Both years had substantial rains 6 days prior to dates shown on graph.

Note: plymouth transducer was offline

Storm Comparison #1: Hydrographs

Storm Comparison #1: Water Calculations for Glazier Way study site Watershed size: 1.519 mi2

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4/4/03 6:00 AM 4/4/03 1:12 PM 4/4/03 8:24 PM 4/5/03 3:36 AM 4/5/03 10:48 AM 4/5/03 6:00 PM

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April 4, 2003

•Inches of rain during storm: 0.70 inches

•Total amount of rain: 2,470,258 ft3

•Percent of rain leaving system via stream:43% (1,064,717 ft3)

•Percent of rain trapped in soil, plants, ponds, or evaporated:57% (1,405,541 ft3)

•Peak Flow: 184 cfs

•Time from peak rain to peak flow: 5 min

•Rate of flow increase, once flow started to increase:Approx 1.5 cfs/min

Length of time it takes to return to pre-storm flow: 14 hours 6 min

Rate of flow decrease for 2 hours after peak flow:Approx 1.3 cfs/min

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May 13, 2010



•Percent of rain leaving system via stream: :52% (1,131,702 ft3)

•Percent of rain trapped in BMPs, soil, plants, ponds, or evaporated:48% (1,056,514 ft3)

•Percent of rain trapped in 75 rainbarrels (assuming they fill completely): 0.03% (602 ft3)

•Percent of rain absorbed by Thurston Elementary Raingarden: 0.01% (191 ft3)

•Percent of rain absorbed by Briarcliff Raingarden: 0.10% (2,118 ft3)


•Time from peak rain to peak flow: 1 hour, 20 min

•Rate of flow increase, once flow started to increase:Approx 1 cfs/ min

•Length of time it takes to return to pre-storm flow: 43 hours 28 min


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5/7/10 12:00 AM 5/7/10 12:00 PM 5/8/10 12:00 AM 5/8/10 12:00 PM 5/9/10 12:00 AM

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3/20/03 12:00 AM 3/20/03 12:00 PM 3/21/03 12:00 AM 3/21/03 12:00 PM 3/22/03 12:00 AM

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2010

2003

Total Rain: 0.4 inches in 2 hours

(plus an additional 0.1 inches earlier in the day)

Total Rain #1 : 0.5 inches mostly within 2 hours

Peak Flow: 42 cfs

Time from peak rain to peak flow: 2 hours

Total Rain #2 : 0.42 inches mostly within 1 hours

Peak Flow: 49 cfs

Time from peak rain to peak flow: 1 hr, 24 min

Prior moisture conditions: 2003 had only minor precipitation throughout March. 2010 had a major storm (about 1 inch rain) five days prior to dates shown on graph.


Storm Comparison #2: Water Calculations for Glazier Way study site Watershed size: 1.519 mi2

March 20, 2003



•Percent of rain leaving system via stream:29% (414,465 ft3)

•Percent of rain trapped in soil, plants, ponds, or evaporated:71% (997, 111 ft3)


•Time from peak rain to peak flow: 19 min

•Rate of flow increase, once flow started to increase:Approx 1.1 cfs/min

Length of time it takes to return to pre-storm flow: 48 hours


May 7, 2010 (note: these numbers are for the second peak, indicating pre-existing wet conditions



•Percent of rain leaving system via stream: :Difficult to determine w/ 2 rain peaks

•Percent of rain trapped in BMPs, soil, plants, ponds, or evaporated:Difficult to determine w/ 2 rain peaks


•Time from peak rain to peak flow: 1 hour, 24 min

•Rate of flow increase, once flow started to increase:Approx 0.61 cfs/ min

•Length of time it takes to return to pre-storm (peak 1) flow: 48 hours


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4/24/10 12:00 PM 4/25/10 12:00 AM 4/25/10 12:00 PM 4/26/10 12:00 AM 4/26/10 12:00 PM

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2010Total Rain: 0.40 inches in 5 hours

(first peak only)

With 0.19 inches in 1 hour.

2003Total Rain: 0.4 inches in 3 hours

(first peak only)

with 0.2 inches in 1 hour


Millers Rainwater Project

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