Rain Water Harvesting PDF Print E-mail
Contributed by Koichi Paul Nii   
Friday, 12 March 2010

Rain Water Harvesting


One of the most wasteful practices in obtaining water is not harvesting rain that falls on urban, suburban areas and on road networks. Most of these rains are presently returned to the ocean. As cities expand in traditional manner, more rainwater is wasted.

Rain Water Harvesting


One of the most wasteful practices in obtaining water is not harvesting rain that falls on urban, suburban areas and on road networks. Most of these rains are presently returned to the ocean. As cities expand in traditional manner, more rainwater is wasted.


By constructing Terraced Structured Land (TSL) for the growth of cities, the rainwater are harvested without the added pollutants that currently assimilates as rain falls on human made surfaces. The total area of portion of staggered platform that is open to the sky is equal to the footprint area of TSL that covers the ground. The amount of rain water collected from all platforms in one bay of various numbers of tiers on TSL is shown on chart 1


Chart 1

Footprint area of TSL based on tier quantity at each Bay (112’)



Tiers






Area – sq. ft.


Gallon from 1” of Rainfall


Liter from 1” of Rainfall


Gallon from 3” of Rainfall


Liter from 3” of rainfall

5

66,528

41,314

156,373

123,942

469,119

6

73,920

45,904

173,747

137,712

521,241

7

81,312

50,494

191,120

151,482

573,363

8

88,704

55,084

208,493

165,252

625,479

9

96,096

59,674

225,866

179,022

677,598

10

103,488

64,264

243,239

192,792

729,718




The average daily amount of water used including watering gardens by a family is about 250 gallons. Chart 2 shows the number of days served by inch of harvested rainfall on each 56’ x 33’ (1,848 sf) open area of a TSL lot.










Chart 2

Gallons, Liters of Water from Each Wide Lot



Tiers




Lots/Bay


Gal.@1” RF


Liter @ 1” RF


Days @ 250 Gal./ Day

5

20

2,966.3

11,227.4sss

11.90

Average Residential Water Usage = 250 Gal./Day



TSL built to replace equal amount of residential properties on ground occupies, at the most, about, 40% of existing land. Chart 3 shows the amount of rain fall on the area of land freed from human occupation with an assumption of 50% of rain being harvested. A smaller existing residential lot area is about 6,000 sq.ft. The common dimension is 50 ft x 120 ft plus half the normal street width of 60 feet. The area of lots from street to street is 15,000 sq.ft. (50 ft. x 300 ft.)



Chart 3

Water amount obtained from remaining Natural Land newly bare from relocation by way of being moved into the TSL


Tiers

# of Lots

Ground Area (sq ft) for # of lots

Difference in the 2 Areas *

Gallons

Liter

50% collectable

5

20

300,000

233,472

145,453

550,540

77,727

275,270

6

24

360,000

286,080

178,228

674,593

89,114

337,297

7

28

420,000

338,688

211,003

798,645

105,502

399,323

8

32

480,000

391,296

243,777

922,697

121,889

461,349

9

36

540,000

443,904

276,552

1,046,750

138,276

523,375

10

40

600,000

496,512

309,327

1,170,803

154,669

565,402

*See chart 1 for footprint area of TSL



Besides rain-water harvesting, TSL has the followings for reducing water consumption:

1. Drainage system consists of two drain lines, one accepting biodegradable sewer and another for non-biodegradable waste. In the trap is a sensor that directs the waste by opening a valve of appropriate drain line.


2. There are two main water lines, one for potable and another for non-potable water. Non potable water obtained from rain that fell on natural ground will be for all vegetations. All vegetations on TSL platform will be in a planter box equipped with drip system tubes that will connect to the non potable line.


3. Most of the energy is from solar panels, impellers, and waste recycling resulting in reduction on the dependency on current water and coal generated energy.


4. Farms on TSL will be on drip system or be hydroponics eliminating the wasteful current irrigation practice.


Terraced Structured Land provides alternative lands that allows for implementation of new systems divorced from the present systems that continue with the hundred of years old systems. The efforts to improve the current systems are in their modification, not replacement of basic system. The water harvesting system is only one new system that is introduced in the TSL.




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