Water Use And The Effect On Lake Cypress Springs
• Adjudicated Water Permit: 11,210 acre-feet/year.
• Cypress Springs Special Utility District: 3500 acre-feet/year
• City of Winnsboro: 3000 acre-feet/year
• City of Mount Vernon: 3000 acre-feet/year
• Unallowcated water: 2210 acre-feet/year
• Ammended and Restated on August 19, 2008
• Term: August 19, 2008 to Deccember 31, 2060
• Maximum Amount of Water Annually: 3500 acre-feet
• Ammended and Restated on February 2, 2015
• Term: February 2, 2015 to Deccember 31, 2035
• Maximum Amount of Water Annually: 3000 acre-feet
• Executed on April 15, 1996
• Term: February 2, 2015 to Deccember 31, 2025
• Maximum Amount of Water Annually: 3000 acre-feet
What about times when the lake is spilling and flood storage is in use?
• Raw water customer diversions have NO impact on lake level when the reservoir level is above conservation pool and flowing into the Morning Glory spillway!
![](./images/water_supply/Slide-1b.png)
How much impact to Lake Cypress Springs lake level is there by Franklin County Water District's customer's diversions?
• Raw water customer diversions account for 1.68 feet total impact on lake level when the reservoir level is below conservation pool!
![](./images/water_supply/Slide-2b.png)
Does the lake “reset” any losses after the lake level reaches conservation pool and starts spilling into the spillway?
• Raw water diversions from customers no longer have any effect on lake level while the lake is overflowing into the spillway.
![](./images/water_supply/Slide-3b.png)
Do water releases from LCS to the City of Mount Pleasant have a significant impact on lake levels?
• Releases to Mount Pleasant do affect the LCS lake levels but only under drought conditions (as shown below) and more slowly than you'd think.
![](./images/water_supply/Slide-4.png)
So how often do the Mount Pleasant releases occur and how did it affect the lake level at LCS
• In the last 3 years only enough water was released to drop the lake level 1 foot!.
![](./images/water_supply/Slide-5.png)
* All data and images reimagined from information provided by Carollo Engineers for Franklin County Water District on April 11, 2023.
Do private irrigation water pumps have a significant impact on Lake Cypress Springs' level?
• Let's consider...
• 805 pumps
• Assume 2 HP at 25 GPM
• Assume 1 Hr. runtime per day
• Assume 3-Year timeline
• 3 Year Total: 0.0034 feet
Do evaporative losses in the reservoir have a significant impact on Lake Cypress Springs' level?
• Evaporation has always had the most impact to any lake's level! In the last 3 years for LCS more than 13 feet has been lost to evaporation!.
![](./images/water_supply/Slide-6.png)
So the lake resets don't affect the Lake Cypress Springs' level drop with evaporation?
• If you factor in reset of the lake over the three years due to rain then the total evaporation impact on the lake level looks like this...
![](./images/water_supply/Slide-7.png)
* All data and images reimagined from information provided by Carollo Engineers for Franklin County Water District on April 11, 2023.