Why should we harvest Rainwater:Combined Sewer Overflows CSO’sReduce our water cost the propertyFree up infrastructure capacity and costsRainwater is more healthy for the soil, it is not as sterile as potable waterUsing rainwater harvesting helps to mitigate flooding, prevent stream degradation from scouring and pollutants
100 ordiance that if you have public water access you must disconnect your alternate water supply.
In most cases commercial properties have a higher ratio of impervious surfaces to total land area, there for catchment and reuse of rainwater is more advantageous.
Often times we are only concerned about the part of the roof we can harvest water from, not all down spouts will be accessible to the collection system
First type of water we will cover, hand watering, just elaborate the points on the slide
Not anybody can water, ask them how many time have they set a new hire out to water only to get poor results
As plants growth blocks the sprays, the systems need to be reconfigured , wet foliage can lead to disease
Low precip. extol the benefits
Next slide will elaborate
Rainwater harvesting & irrigation
Rainwater Harvesting & Irrigation Using Rainwater as a supplemental source of water for your landscape irrigation systemBy Sean Mullarkey CID, CLIA, CIC, CGIA513.379-5780
What comes down goes around?• Can we catch all the rain?• Do we need all the rain?• How can we use all the rain?
Cincinnati Weather Jan Feb M ar A pr M ay Jun Jul A ug Sep Oct Nov DecA vg. Hi gh 38° 42° 54° 65° 75° 84° 86° 85° 78° 67° 54° 44°A vg. Low 21° 24° 34° 44° 52° 61° 66° 64° 57° 44° 35° 26°M ean 30° 34° 44° 54° 64° 72° 76° 75° 68° 56° 45° 35°A vg. P r eci p. 50 2. 2. 50 4. 30 3. 70 4. 40 3. 40 4. 10 3. 70 3. 10 2. 80 3. 30 3. 10A vg. E T 0. 62 1. 12 2. 17 3. 60 5. 27 6. 30 6. 51 5. 90 4. 20 2. 79 1. 20 0. 62 What is Effective Rainfall ver. Actual Rainfall?
Don’t Let It Get Away!• Sources of Rain Water? “I wasn’t thinking the sky!” – Roofs • Least amount of pollutants • Elevation of gutter allows directing to tank without pump • Easy to pre-filter and provide first flush • Low cost of conversion – Pavement • Dirt and pollutants are more abundant • May need pumps to move water to storage area • Can be expensive to convert for collecting Rain, more cost effective if done during construction
Don’t Let It Get Away!• Sources of Rain Water? – Landscape Areas • Detain or Retain? • Contour planting • Rain Gardens • Soil improvements
Site Comparison Area Home 1” Rain Bank 1” Rain Land SF 22700 45500 Pavement SF 900 24200 Roof SF 1200 748 gal 5800 3613 gal Landscape/turf SF 20600 91% 15500 34%Rainwater Formula ( SF x .623 = Gal. Collected for 1 inch rainfall).623 is a constant that coverts Square Feet to Gallons
Home PWR / AW Plant Water Requirement / Available Water1,200,000 Home Property1,000,000 800,000 Water needed for plants 600,000 Rain Total Available 400,000 200,000 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Bank PWR / AW Plant Water Requirement / Available Water800,000 Bank Property700,000600,000500,000 Water needed for plants400,000 Rain Total Available300,000200,000100,000 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
What are we going to water• What are we going to use the water for• When will we need it.• Where will it be located
How much water do our plants need?• Practical methods , the kind you use every day• Management methods, depends on how much management budgets for watering• Scientific Methods, good for developing a base line to use along with your practical methods
Plant Water Requirement (PWR)• PWR = Landscape Coefficient X Reference ET KL = KP x Kd x Kmc • KL = landscape coefficient • KP = plant factor • Kd = vegetation density factor • Kmc = microclimate factor
Storage Tank Cost MATERIAL COST, Small System COST, Large system galvanized steel $225 for 200 gallons $950 for 2000 gallons polyethylene $160 for 165 gallons $1100 for 1800 gallons fiberglass $660 for 350 gallons $10,000 for 10,000 gallons ferro-cement Price variable upon location Price variable upon locationfiberglass/steel composite $300 for 300 gallons $10,000 for 5000 gallons aluminum Cost prohibitive for water use Cost prohibitive for water use http://www.lid-stormwater.net/raincist_cost.htm
Using the Rain Water• Most Rainwater Harvesting System are best utilized watering landscape plantings not turf because of the limited size of storage units• If you have a large storage area such as a lake all planted areas can be watered with the stored rainwater• Most systems will need some sort of pump to distribute the water through a pipe net work
Amount of water needed per 100 Sq. Ft. per month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecGal/ 27 49 95 157 230 275 284 257 183 122 52 27100SF
Types of irrigation for landscape Beds • Hand Watering • Pros: – Can apply varying amounts of water to specific plant – Can conserve water resources – Allows for visual inspection of plants – Equipment cost are low
Types of irrigation for landscape Beds• Hand Watering• Cons: – Labor cost are very high – Need skilled labor – Time consuming
Types of irrigation for landscape Beds• Automatic overhead irrigation• Pros: – Well designed systems eliminate waist – Very low labor needs – Large water window (application time) – Frees up labor for other task
Types of irrigation for landscape Beds• Automatic overhead irrigation• Cons: – High initial expense – Mostly a shotgun approach – Blocked easily by plant material – Inflexible to alterations – Wets foliage
Types of irrigation for landscape Beds Drip and low volume irrigation Pros: Highest potential efficient use of water Low labor needs Economical to install Largest water window Places water at or near the roots Keeps foliage dry Low precipitation rates
Types of irrigation for landscape Beds• Drip and low volume irrigation• Cons: – Can be unsightly – Easily damaged when working in the beds – Hard to visually inspect its operation – Needs clean water
Best types of irrigation for landscape Beds Drip and low volume irrigationMost cost effective in the long term, utilizes the ever more precious resource of water better than any method, will get you LEED points , very flexible to change, can be unsightly if not installed properly.
Best types of irrigation for landscape Beds• Controlling the rate of application – Drip and low volume irrigation have very low precipitation rates. Hand watering can be controlled to eliminate run off as well. • No run off • Will not remove air from soil unless it is allowed to run for to long of an irrigation cycle – Over head irrigation generally has a very high precipitation rate , so do hose end sprinklers
Best types of irrigation for landscape Beds• Low volume irrigation provides the most advantages over the alternative methods – Efficient use of water – LEED qualified (GREEN) – Waters better than most rain storms as considered against uniformity and precipitation rate – Drip goes hand in hand with rain water harvesting
Best types of irrigation for landscape Beds• Rain water harvesting – If you are using any type of cisterns to capture rain water, drip is an Ideal way to use that water • Need to filter the water before use • If water is from pavements check for soluble salts and other contaminants
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