Historical and recent Historical and recent w ater level - - PowerPoint PPT Presentation

Historical and recent Historical and recent w ater level fluctuations in w ater level fluctuations in Lake Apopka Lake Apopka Lake Apopka Lake Apopka

Rolland Fulton Rolland Fulton B rea

• f En ironmental Sciences

B rea

• f En ironmental Sciences

Bureau of Environmental Sciences Bureau of Environmental Sciences September 4, 2015 September 4, 2015

Early reports of Lake Apopka Early reports of Lake Apopka t l l t l l w ater levels w ater levels

• At extremely high stages Lake Apopka

At extremely high stages Lake Apopka At extremely high stages, Lake Apopka At extremely high stages, Lake Apopka

• verflowed northward through a swale
• verflowed northward through a swale

connecting the lake with Lake Beauclair connecting the lake with Lake Beauclair connecting the lake with Lake Beauclair connecting the lake with Lake Beauclair (M.H. Connell & Assoc. 1954) (M.H. Connell & Assoc. 1954)

Atlas to accompany the official records of the Union and Confederate Armies. 1861‐1865

Early reports of Lake Apopka Early reports of Lake Apopka t l l t l l w ater levels w ater levels

• 1893

1893 – – Canal dredged from Lake Apopka to Canal dredged from Lake Apopka to g p p g p p Lake Dora lowered lake level by 4 feet Lake Dora lowered lake level by 4 feet

• By 1910 canal filled with vegetation and lake

By 1910 canal filled with vegetation and lake stage similar to original state stage similar to original state stage similar to original state stage similar to original state

• USACE 1911

USACE 1911 – – water level range 69.1 to 70.2 ft water level range 69.1 to 70.2 ft (equivalent to 66.7 (equivalent to 66.7 – – 67.8 ft NAVD) 67.8 ft NAVD) (equ a e t to 66 (equ a e t to 66 6 8 t ) 6 8 t )

• 1915 newspaper report

1915 newspaper report – – Zellwin Zellwin-

• Florida Farms

Florida Farms Company has learned that the low water mark Company has learned that the low water mark h b t bli h d t 62 ft (61 1 ft NAVD?) h b t bli h d t 62 ft (61 1 ft NAVD?) has been established at 62 ft (61.1 ft NAVD?) has been established at 62 ft (61.1 ft NAVD?) instead of 65.3 (64.4 ft NAVD?) as assumed at instead of 65.3 (64.4 ft NAVD?) as assumed at the the Tildenville Tildenville meeting meeting

2015 w ater levels and Doppler 2015 w ater levels and Doppler i f ll t l k t h d i f ll t l k t h d rainfall to lake w atersheds rainfall to lake w atersheds decreases decreases

Lake Water level 2015 rainfall change through Sep 2 (inches) through Sep 2 (inches) p ( ) ( ) Apopka +3.24 34.1 Burrell +0.24 32.9 Griffin –2.04 34.8 Griffin 2.04 34.8 Yale +0.36 a 34.4

a Lake Yale water level change through Aug 14

2015 w atershed and lake areas 2015 w atershed and lake areas

Lake Watershed area Lake Area Watershed to lake (acres) (acres) area ratio Apopka 85,000 32,000 2.7 p p , , Burrell basin lakes 211,400 a 33,000 6.4 Griffin 281,800 b 13,800 20.4 Griffin 281,800 13,800 20.4 Yale 11,400 3,900 2.9

a I

l d P l tl k h b i i th di h f

a Includes Palatlakaha basin since there were discharges from

that basin in 2015

b Includes Burrell basin since there were discharges from

that basin in 2015