Presentation on theme: "WHY DID MISSOURI CITY ADOPT A JOINT GROUNDWATER REDUCTION PLAN? A subdivision in Baytown, located in Harris County, has been turned into a park and is."— Presentation transcript:
WHY DID MISSOURI CITY ADOPT A JOINT GROUNDWATER REDUCTION PLAN? A subdivision in Baytown, located in Harris County, has been turned into a park and is now underwater because of the sinking of the land.
Why Reduce Groundwater Usage? To prevent subsidence contributing to: Flooding Rising waters resulting from storms or hurricanes Lowering of groundwater capacities What is subsidence? When pumping large amounts of groundwater from underground aquifers, the clay compacts and the elevation of the land surface sinks.
What does subsidence look like? Examples of subsidence in the Greater Houston area 1 ft. 2 ft. 3 ft. 4 ft. 5 ft. 6 ft. Showing drop in ground elevation 7 ft.8 ft. 9 ft. 10 ft.
Missouri City Joint Groundwater Reduction Plan The City of Missouri City, in partnership with other entities, prepared a joint Groundwater Reduction Plan (GRP) to comply with Fort Bend Subsidence District requirements for reduction of groundwater use. Fort Bend Subsidence District 1989: Created for the regulation and withdrawal of groundwater to prevent subsidence. 1998: The Texas Water Development Board certified FBSDs Groundwater Management Plan, which set 5 goals: 1.Provide for the efficient use of groundwater 2.Control and prevent waste of groundwater 3.Control and prevent subsidence 4.Address conjunctive surface water management 5.Address groundwater natural resources issues
Groundwater vs. Surface Water Groundwater and surface water are linked together through the hydrologic cycle Groundwater Surface water 1. Once polluted very hard and expensive to clean 1. Once polluted can be cleaned and fairly inexpensive 2. Sources diminishing 2. Few effects on the environment 3. Adverse effects on the environment 3. Ability to be expanded for larger demand (for example, subsidence) The end product will be similar for all drinking water Groundwater and surface water both have to meet the same federal and state quality standards for drinking water
Groundwater Reduction Goals for Missouri City The City of Missouri City and its partners will meet the following Subsidence District requirements: January 2013: Will reduce and maintain groundwater withdrawals to no more than 70% of participants total water demand. January 2025: Will reduce and maintain groundwater withdrawals to no more than 40% of each participants total water demand.
Who Will be Converted to Surface Water? The Missouri City Joint GRP established the most cost-effective method of meeting the Subsidence District requirements January 2013 : Convert entities in the Citys southern portion (Sienna Plantation) to meet 30 % reduction As the 60% reduction requirement approaches in 2025, convert additional entities, generally moving northward on the system. (Picture: Initial converting entities)
Surface Water Source and Treatment Initial Surface Water Supply – Brazos River Surface Water Treatment Plant Initial capacity of 10 million gallons per day of drinking water – Built-out capacity of over 30 MGD
Cost to Implement Missouri City Joint GRP Phase 1 – 10 MGD surface water treatment plant and transmission pipelines to Sienna Plantation Water Plants 1 &2 Pumpage fee for all participants At a cost per 1,000 gallons of water used Fees determined each year through budgeted annual costs and projected water use At budget year end, a true-up will assure no single entity bears any more risk than any other participating entity Detailed Project Cost
Cost Comparison The Do Nothing Option – If the Joint GRP plan was not being implemented, the Fort Bend Subsidence District would implement a fee of $3.50/1,000 gallons pumped. The Current Pumpage Fee – Effective July 1, 2009, the pumpage fee is $1.10/1,000 gallons pumped. The Estimated Future Pumpage Fee – The estimated future pumpage fee after plant construction is approximately $2.35/1,000 gallons pumped. Estimated GRP Plan Savings to Participants: $1.15 per 1,000 gallons pumped or $11.50 per month for the average home
Sources Information – Subsidence Districts – Fort Bend Subsidence District » – Harris Galveston Subsidence District » – Missouri City Joint Groundwater Reduction Plan Pictures Other Related Links geochange.er.usgs.gov/sw/changes/anthropogenic/subside/ asthecourtturns.blogspot.com/2009/02/is-fort-bend-sinking.html