SlideShare a Scribd company logo
Dr. Larry Sunn
Director, CTGCD
https://RainBees.com
Public Service
Rain Harvesting Consultants
Slice of
bread
Cup of
coffee
Glass of
wine
Glass of
milk
Ham-
Burger
Person’s
footprint
10
gallons
35
gallons
66
gallons
265
gallons
635
gallons
2,000
Gallons
per day
How Much Water to Produce it?
https://www.watercalculator.org/
Harvesting
Rain
https://RainBees.com
Aquifers,
The BCRA & GCD,
• River Authorities and Special Law Districts manage
surface water - Bandera County River Authority &
Groundwater Conservation District
• GCDs manage groundwater
• BCRA & GCD – Trinity Aquifer.
• Accountable to constituents
– via County Commissioner appointment.
• Manage groundwater rights
• Issue drilling authorizations
• Research aquifer level & quality
• How State manages groundwater
Discussing water rights; - a western pastim
GCD – What We Do
GCD – What We Do
Must be permitted.
Drill THROUGH the Edwards
Casing requirements
Size of the bore hole
Not in Flood Zone
Texas’ “Right of Capture”
Edwards
Trinity
Eastern New Braunfels
Confined
Unconfined
Trinity
Aquifer
Edwards
Aquifer
Confining crown:
layers of shale
& dense clay
Confined
Unconfined
Edwards Aquifer
Edwards Aquifer Zones
Contributing zone
Recharging the Edwards
Contributing zone
Recharge zone
Artesian zone
Water table spring
Edwards water
table
Balcones fault zone
Trinity Aquifer
On the
Edwards
Plateau
volcanic
rock
cracks in
limestone
Sinkhole.
limestone
Volcanic and
sedimentary rock
Karst
caves.
Spring.
rain
Edwards Recharge Comal Spring in Landa Park
Trinity Aquifer Strata
“I’m not in the
Trinity…”
“… I’m in the
Glen Rose.”
Sligo
Upper Trinity: Upper Glen Rose
Middle Trinity: Lower Glen Rose, Hensell
Lower Trinity: Sligo, Hosston
14 years
14 years
~50’ average drop
~3.5’ per year
~80’ average drop
~ 5.7’ per year
The Trinity Aquifer
 Hit & miss drilling
 TWDB in 2000: – “Trinity expected to be
Severely stressed – in 20 to 50 yrs.”
Recharging the Trinity
1
2
Water recharge moves slowly
3
Falls here, recharges here
4
2 to 3 years
5
4-5% recharges Trinity
Dallas
San Antonio
59,000 acre-feet per year to Edwards.
What is an Acre Foot?
How Much Water?
Nissan
Frontier
King Cab
17’ x 6’
102 square feet of lawn
17’ x 6’
twice per week
1” water
gallons of water per month
508
4,553 gal/9 mo.
Please, don’t!
3. Drinking water standards
2. Water supply decline
It’s Not a Drought Issue!
5. Protect via conservation
It’s easiest & cheapest
4. Wastewater concerns
1. Growth and development
Toilet to Tap
Big Spring,
Odessa, &
Midland
Wichita Falls
El Paso
Las Vegas, San Diego, Anaheim, Santa Ana,
Orange County, Los Angeles, San Francisco,
Tampa, Daytona Beach, Mt. Pleasant, MI
Development Impact on Water Cycle
50%
percolation
10% run-off
40%
evaporation
transpiration
15%
percolation
55% run-off
30%
evaporation
transpiration
What Can We Do?
 Increase supply
 Reduce demand
What Can We Do?
What Can We Do?
 Conserve
 “Prairie Pooling”
 Rain garden
 Stop watering lawns
 Capture rain.
. . . in the rain!
https://RainBees.com
Feed the aquifer
Feed the aquifer Semi-arid
Rain Harvesting Use
Irrigation
& Animals
Household
Screening, storage, & filters.
Pump
Dry vs. Wet
Overflow.
Rain stops,
Pipes dry
Dry vs. Wet
3 feet
Overflow
Cleanout
Rain stops,
Pipes stay wet
Pre-tank Screening
#1 Leaf Guards
#2 Leaf filter
#3 Sock filter (Maelstrom)
~180 micron
First
flush.
Often undersized
20 gal per 1000 sq ft
1 for every downspout
Maintenance chore
Must drain periodically.
Tank system
Bypass when filled
Use for irrigation
Little maintenance.
First Flush
“Dirty”
water
from
roof
“Cleaner”
water to
storage
Rain Storage Containers
 Barrels, polyethylene, fiberglass, wood,
concrete, or metal
 Water is heavy!
 8.36 pounds per gal.
1,800 pounds
Post-tank Filters – For Potable
out
From
tank
Pump
UV
Filter
to
neutralize
pathogens
Pressure
gauges
20
micron
5
micron
Spin
down
filter
Water
meter
To
garden
How Much Can I Collect?
 .62 gal per square foot per 1” rain
 1” of rain on 1,000 sq ft roof
 1,000 x .62 = 620 gal
 620 gal x 34” per year = 21,080 gal/yr.
12”
12”
1 Sq Ft
=
.62 gallon
Source - Roof Footprint Sq Ft
Easy Rule of Thumb – Ballpark Figure
 Home square feet plus 20%
 1,700 sq ft x 1.2 = 2,040
45’
25’
30’
30’
1,700 sq ft
house
Calculate Supply
 1” rain
 2,040 x .62 = 1,265 gal
 34” per year
 1,265 x 34 = 43,010 gal.
45’
25’
30’
30’
1,700 sq ft
House
~2,040 Sq ft
Demand & Tank – Indoor Use
 # people x 50 gal per day
 3 x 50 = 150 gal per day
 150 gal x 30 days = 4,500 gal per month
 How much drought reserve?
 3 months
 4,500 x 3 = 13,500 gal
 Storage tank(s) needed
 15,000 gal.
7’
19’
Outdoor Use – Demand
 Turn off all water fixtures
 Read meter
 Run sprinklers—all stations—1 cycle
51955
8 Stations
Calculate Demand – Outdoor Use
 Turn off all water fixtures
 Read meter
 Run sprinklers—all stations—1 cycle
 Read meter
 Multiply cycle amount x # cycles per week
 1,920 x 2 = 3,840/wk
 15,360 gal per month
 184,320 gal per year
53875 (used 1,920 gal)
51955
Questions?
Dr. Larry Sunn
903.452.0801
Dr. Steven Grainger
210.286.8050
https://RainBees.com
https://www.watercalculator.org/

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Water Catchment Presentation May 18 2023.pdf

  • 1. Dr. Larry Sunn Director, CTGCD https://RainBees.com Public Service Rain Harvesting Consultants
  • 2. Slice of bread Cup of coffee Glass of wine Glass of milk Ham- Burger Person’s footprint 10 gallons 35 gallons 66 gallons 265 gallons 635 gallons 2,000 Gallons per day How Much Water to Produce it? https://www.watercalculator.org/
  • 4. • River Authorities and Special Law Districts manage surface water - Bandera County River Authority & Groundwater Conservation District • GCDs manage groundwater • BCRA & GCD – Trinity Aquifer.
  • 5.
  • 6.
  • 7. • Accountable to constituents – via County Commissioner appointment. • Manage groundwater rights • Issue drilling authorizations • Research aquifer level & quality • How State manages groundwater Discussing water rights; - a western pastim GCD – What We Do
  • 8. GCD – What We Do Must be permitted. Drill THROUGH the Edwards Casing requirements Size of the bore hole Not in Flood Zone Texas’ “Right of Capture” Edwards Trinity Eastern New Braunfels
  • 12. Recharging the Edwards Contributing zone Recharge zone Artesian zone Water table spring Edwards water table Balcones fault zone Trinity Aquifer
  • 13. On the Edwards Plateau volcanic rock cracks in limestone Sinkhole. limestone Volcanic and sedimentary rock Karst caves. Spring. rain Edwards Recharge Comal Spring in Landa Park
  • 14. Trinity Aquifer Strata “I’m not in the Trinity…” “… I’m in the Glen Rose.” Sligo Upper Trinity: Upper Glen Rose Middle Trinity: Lower Glen Rose, Hensell Lower Trinity: Sligo, Hosston
  • 15. 14 years 14 years ~50’ average drop ~3.5’ per year ~80’ average drop ~ 5.7’ per year
  • 16. The Trinity Aquifer  Hit & miss drilling  TWDB in 2000: – “Trinity expected to be Severely stressed – in 20 to 50 yrs.”
  • 17. Recharging the Trinity 1 2 Water recharge moves slowly 3 Falls here, recharges here 4 2 to 3 years 5 4-5% recharges Trinity Dallas San Antonio 59,000 acre-feet per year to Edwards.
  • 18. What is an Acre Foot?
  • 19. How Much Water? Nissan Frontier King Cab 17’ x 6’ 102 square feet of lawn 17’ x 6’ twice per week 1” water gallons of water per month 508 4,553 gal/9 mo. Please, don’t!
  • 20. 3. Drinking water standards 2. Water supply decline It’s Not a Drought Issue! 5. Protect via conservation It’s easiest & cheapest 4. Wastewater concerns 1. Growth and development
  • 21. Toilet to Tap Big Spring, Odessa, & Midland Wichita Falls El Paso Las Vegas, San Diego, Anaheim, Santa Ana, Orange County, Los Angeles, San Francisco, Tampa, Daytona Beach, Mt. Pleasant, MI
  • 22. Development Impact on Water Cycle 50% percolation 10% run-off 40% evaporation transpiration 15% percolation 55% run-off 30% evaporation transpiration
  • 23. What Can We Do?  Increase supply  Reduce demand
  • 24. What Can We Do?
  • 25. What Can We Do?  Conserve  “Prairie Pooling”  Rain garden  Stop watering lawns  Capture rain. . . . in the rain! https://RainBees.com Feed the aquifer Feed the aquifer Semi-arid
  • 26. Rain Harvesting Use Irrigation & Animals Household Screening, storage, & filters. Pump
  • 27. Dry vs. Wet Overflow. Rain stops, Pipes dry
  • 28. Dry vs. Wet 3 feet Overflow Cleanout Rain stops, Pipes stay wet
  • 29. Pre-tank Screening #1 Leaf Guards #2 Leaf filter #3 Sock filter (Maelstrom) ~180 micron First flush.
  • 30. Often undersized 20 gal per 1000 sq ft 1 for every downspout Maintenance chore Must drain periodically. Tank system Bypass when filled Use for irrigation Little maintenance. First Flush “Dirty” water from roof “Cleaner” water to storage
  • 31. Rain Storage Containers  Barrels, polyethylene, fiberglass, wood, concrete, or metal  Water is heavy!  8.36 pounds per gal. 1,800 pounds
  • 32. Post-tank Filters – For Potable out From tank Pump UV Filter to neutralize pathogens Pressure gauges 20 micron 5 micron Spin down filter Water meter To garden
  • 33. How Much Can I Collect?  .62 gal per square foot per 1” rain  1” of rain on 1,000 sq ft roof  1,000 x .62 = 620 gal  620 gal x 34” per year = 21,080 gal/yr. 12” 12” 1 Sq Ft = .62 gallon
  • 34. Source - Roof Footprint Sq Ft
  • 35. Easy Rule of Thumb – Ballpark Figure  Home square feet plus 20%  1,700 sq ft x 1.2 = 2,040 45’ 25’ 30’ 30’ 1,700 sq ft house
  • 36. Calculate Supply  1” rain  2,040 x .62 = 1,265 gal  34” per year  1,265 x 34 = 43,010 gal. 45’ 25’ 30’ 30’ 1,700 sq ft House ~2,040 Sq ft
  • 37. Demand & Tank – Indoor Use  # people x 50 gal per day  3 x 50 = 150 gal per day  150 gal x 30 days = 4,500 gal per month  How much drought reserve?  3 months  4,500 x 3 = 13,500 gal  Storage tank(s) needed  15,000 gal. 7’ 19’
  • 38. Outdoor Use – Demand  Turn off all water fixtures  Read meter  Run sprinklers—all stations—1 cycle 51955
  • 40. Calculate Demand – Outdoor Use  Turn off all water fixtures  Read meter  Run sprinklers—all stations—1 cycle  Read meter  Multiply cycle amount x # cycles per week  1,920 x 2 = 3,840/wk  15,360 gal per month  184,320 gal per year 53875 (used 1,920 gal) 51955
  • 41.
  • 42.
  • 44. Dr. Larry Sunn 903.452.0801 Dr. Steven Grainger 210.286.8050 https://RainBees.com https://www.watercalculator.org/