02-10-1997 Council Packet - Laserfiche WebLink

Home Browse Search

METHODS AND MATERIALS I SAMPLE SITE SELECTION Five sample sites were established at the four golf courses. Because the Minikahda Club received runoff from a large upstream watershed, a sample site was established both upstream and downstream of the course. All of the sample site watersheds contained some areas which were not turf, e.g. buildings, roads, and cart paths. The Baker National watershed for example contained approximately 600 feet of a 10 foot wide blacktop cart path. However, the non-turf areas never accounted for more than 3 percent of the study watershed, (Table 1). At each site a data logger connected to either a pressure transducer level sensor, or a combination level and velocity sensor, was installed. At Baker National, Meadowbrook and two sites at Minikahda, the probes were Installed in pipes. Flow was calculated by the data loggers as the product of the velocity and depth of water In the pipe. However, the velocity sensor at the Minikahda Inlet site intermittently provided negative readings. The cause of the problem was discovered to be the amount of debris and scum which coated the probe. The probe was cleaned at least three times weekly, but within 24 hours of cleaning would provide erroneous readings. The level measurements made by the same probe were found to be in agreement with the staff gauge readings on almost all occasions. Therefore, a stage discharge curve was developed from level and velocity readings taken within 12 hours of probe cleaning. The discharge from the equation was in close agreement with the flow from the Minikahda outlet station. At the Woodhill Country Club, the pressure transducer level sensor was installed in a sump pit. The data logger measured the number of times each day the pit was emptied by a pump. Flow was calculated as the product of pit volume and the number of times each day the pit was emptied. Automatic samplers at each site were slaved to the dataloggers and collected samples at discrete Intervals during runoff events. The samplers were equipped with stainless steel Intake strainers and a teflon intake line. Runoff water was discharged into a single glass container In each of the samplers. BAKER NATIONAL GOLF COURSE The study site at Baker National consisted of a 46.7 acre watershed area draining to a low area, between the first and third holes of the regulation 18 hole course, (Table 1). An existing 36 inch manhole with a surface inlet collected runoff water from the watershed. The manhole was positioned directly above a 24 inch concrete storm sewer pipe which flowed to Spurzem Lake. An additional 36 inch manhole with a