1985-1781126L
NO $.-L
AN ORDINANCE AUTHORIZING THE CITY MANAGER TO EXECUTE AN AGREEMENT
BEIWLBN THE CITY OF DENTON AND THE CITY OF DALLAS AND NORTH TEXAS
STATE UNIVERSITY FOR LIMNOLOGICAL STUDIES ON LAKE RAY ROBERTS, AND
APPROVING THE EXPENDITURE OF FUNDS THEREFORE, AND PROVIDING FOR AN
EFFECTIVE DATE
WHEREAS, the City Council has determined that it is in the best
interest of the citizens of the City to enter into a Monitoring and
Research Contract with the City of Dallas and North Texas State
University to provide a cooperative program of Limnological Studies
on Lake Ray Roberts, and
WHEREAS, Section 2 36(f) of the Code of Ordinances requires
that the City Council approve all expenditures of more than $3,000,
and
WHEREAS, Section 2 09 of the Charter of the City of Denton,
Texas requires that every act of the Council providing for the
expenditure of funds or for the contracting for indebtedness shall
be by ordinance, NOW, THEREFORE,
THE COUNCIL OF THE CITY OF DENTON, TEXAS HEREBY ORDAINS
SECTION I
That the City Manager and City Secretary are hereby authorized
and directed to execute and attest, respectively, the contract
between the City of Denton, City of Dallas and North Texas State
University under the terms and conditions contained in said
contract which is attached hereto and made a part hereof
SECTION II
That the City Council authorizes the expenditure of funds in
the amount of $14,773 00 as specified in the attached Monitoring
and Research Contract
SECTION III
That Ordinance No 85-134 is hereby, in all respects, repealed
SECTION IV
That this ordinance shall become effective immediately upon its
passage and approval /
PASSED AND APPROVED this the day of 1985
PL V auv w~+, •OF DF TON, TEXAS
ATTEST
CJ (G(/C CHARLOTTE AL EN,-CITY SECRETARY
CITY OF DENTON, TEXAS
APPROVED AS TO LEGAL FORM
DEBRA ADAMI DRAYOVITCH, CITY ATTORNEY
CITY OF DENTON, TEXAS
BY /lG) %.14Z2 G( C
CITY& DENTON, TEXAS MUNICIPAL BUILDING / DENTON TEXAS 76201 / TELEPHONE (817) 566 8200
M E M O R A N D U
TO CHARLOTTE ALLEN, CITY SECRETARY
FROM GAY RACINA, Sr Secretary
DATE October 24, 1985
RE NTSU Agreement (Cities of Dallas and Denton)
Monitoring and Research Contract
Attached please find the original of the above-referenced
document for filing with the official City Records This
contract was approved on September 3, 1985, under ordinance
85-178
1 \
XavRaic Ina
Sr Secty
cc Nelson, R E
file
Attachment
C~/f COUNCIL CHAMBER 8526C
L August 14, 1985
WHEREAS, City of Dallas Water Utilities Department has an ongoing applied
research program to investigate processes, chemicals and equipment relat-
ing to water and wastewater technology, and
WHEREAS, it is to the mutual benefit of Dallas, the City of Denton, and
the North Texas State University through its Institute of Applied Science
and Aquatic Sciences Program in the Department of Biological Sciences to
enter into a cooperative program to pursue research to the area of water
supply monitoring and research on Ray Roberts Lake, Now, Therefore,
BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY OF DALLAS
SECTION 1 That the City Manager be and is herebv authorized to enter
into an agreement with the City of Denton and North Texas State University
to conduct a cooperative research program in water supply monitoring and
research at a fee not to exceed $42,048 00
ECTION 2 That amount of $42,048 to be encumbered and allocated as
rollows
FUND ORG ACCOUNT TASK OPTION ACTIVITY ENCUMBRANCE
T II 7M -77-- TDV- -7u 7€'NZbTS11-
SECTION 3 That the Director of Finance be and is authorized to disburse
funds from Fund 100011, Org 7010, Account 3070, Task ADM , Activity 7C921H
Encumbrance 7ENCO78A, not to exceed $42,048
SECTION 4 That this resolution shall take effect immediately from and
after its passage in accordance with the provisions of the Charter of the
,.ity of Dallas and be it accordingly so resolved
, APPRovgj) By
CI7Y000NCIL
AUG 14 F9Cd
w
A
04
APPROV[D APPROV /
Rfr ~ HEAD Of DEPARTMENT ~7NIF OTOR OF FjR~
EM ta0{00a n\_\/
The money reoulred for this exp=nM1N
18 avad-ible and credited o i p 0,
fund as provided for in th h r r
lh o y~
APPROVE C
J .4LTLMANAOEP
1 Gty Man,ano..
85260
THE STATE OF TEXAS )
MONITOR AND RESEARCH CONTRACT
COUNTY OF DALLAS )
TdIS CONTRACT is made and entered into by and between the CITY OF
DALLAS, a municipal corporation, of Dallas County, Texas,
(hereinafter called "DALLAS"), the CITY OF DENTON, a municipal
corporation of Denton County, Texas (nereinafter called "DENTON")
and NORTH TEXAS STATE UNIVERSITY, a non-profit State institution of
higher education, having its principal place of ousiness at the
Administration Building, North Texas State University, Denton,
Texas, 76203, (hereinafter called "INVESTIGATOR")
1 PURPOSE
It is to the mutual benefit of the DALLAS, DENTON and the
INVESTIGATOR to enter into a cooperative program of Limnological
Studies on Lake Ray Roberts for toe purposes of pursuing monitoring,
research and training related to water quality Tn1s contract is
tormulateu to state the terms ana conditions under wnich the
INVESTIGATOR snail, through its Inztitute of Applied Science and
Aquatic Sciences Program in the Department of Biological Sciences,
conduct research ana monitoring to assist the DALLAS and DENTON in
implementing the aforesaid Cooperative Program of Limnologicdl
Studies on Lake Ray Roberts
1
8.5 9.06(
2 ADMINISTRATION
DALLAS, acting through its Director of Water Utilities,
(hereinafter referred to as "Director"), shall be responsible for
administering and enforcing toe terms of this agreement on behalf of
DALLAS and DENTON DENTON shall oe consulted beforenand as to any
question involving interpretation of the terms of the agreement
DENTON'S consent, wnere required under the terms of this contract,
snall not be unreasonably withheld
3 DESCRIPTION OF SERVICES
INVESTIGATOR'S services shall be rendered for the purpose of
conducting water quality monitoring and research at Lake Ray Roberts
in the following areas
a Development of baseline water quality data in the streams
feeding Lake Ray Roberts
o Development of a nutrient budget for the reservoir,
quantifying sources and sinKS of pnospc,orus and nitrogen
c Development of a relationship between land uses in the
watershed and nutrient loadings to toe reservoir
d Development of a eutropnication model for Lake Ray Roberts
predicting trophic status through time
A detailed description of the services to ce rendered oy the
INVESTIGATOR is contained in Exhibit A, and Exhibit B is the
2
85260
proposed budget for the services
INVESTIGATOR shall perform all services as set forth in Exhibit A
provided, however, that where the terms of Exhibit A conflict with
the terms of this Contract, the terms of this Contract shall be
final and binding
INVESTIGATOR shall make written progress reports on the activities
conducted under this Contract every three months, and shall submit a
final report at the conclusion of this Contract
INVESTIGATOR shall deliver all data, reports and documents wnicn
result from its services to the Director in such form as is
satisfactory to the Director A copy of ail such documents snail
also be forwarded to DENION
4 PERFORMANCE OF SERVICES
INVESTIGATOR and its employees or associates shall perform all
toe services under this Contract The principal
employees/associates unaer this Contract are
Kenneth L ClCKson
David A Pillard
INVESTIGATOR represents that all employees or associates who perform
services under this Contract shall be fully quolitiea and competent
to perform the services described in Section 2 INVESTIGATOR agrees
3
8526(
that it will use its best efforts to perform services under this
Contract in a professional manner
5 TERM
Work under this Contract shall commence on or about August 1,
1985 and continue for eignteen (18) montns All work shall be
completed by January 31, 1987 All services, written reports and
other data are to be completed and deliverea to DALLAS and DENTON by
the stated date unless an extension of time, based upon good reasons
presented by INVESTIGATOR, is approved by the Director
6 PAYMENTS
In consideration of the professional services to be performed by
the INVESTIGATOR under the terms of tnis Contract, DALLAS and DENTON
snall pay INVESTIGATOR a tee not to exceea $56,821, unless later
amended by mutual agreement in writing, approved by me Dallas and
Denton City Councils Tn15 fee is ro be pain to INVESTIGATOR based
upon monthly invoices to DALLAS and DENTON snowing actual services
rendered, consistent witn the cudget described in Exhibit B
Payments to INVESTIGATOR snail be in the amount snown by the
billings and other documentation submitted and are subject to the
Director's approval All services snail oe performed to the
satisfaction of the Director and DALLAS ana DENTON shall not be
liable for any payment under this Contract for services which are
unsatisfactory and which have not been approved by the Director
The
final
payment
4
8526(
due hereunder will not be paid until all reports, data and other
documents required under this contract have been received and
approved by the Director One costs incurred under this Contract
will be snared by DALLAS and DENTON, with DALLAS paying 748 of the
total fees invoiced (not to exceed $42,048), and DENTON paying 268
of the total fees invoicea (not to exceed $14,773) DALLAS, as
administrator of this Contract, shall make payments under this
Contract directly to INVESTIGATOR, ana DENTON shall reimburse DALLAS
monthly for DENTON'S proportionate snare of those payments
7 CHANGES IN SERVICES
DALLAS thcougn its Director, with consent of DENTON, may request
from time to time changes in the scope or focus of the activities,
investigations and stuaies conducted or to be conducted by
INVESTIGATOR pursuant to this Contract Any such change which
varies significantly from the scope of services set out in Section 2
and would entail a siynificant increase in cost or expense to
INVESTIGATOR shall be mutually agreed upon oy INVESTIGATOR ano the
Director Changes in the scope, which in the opinion of
INVESTIGATOR and the Director would require additional funding by
DALLAS and DENTON, must first be authorized in advance cy resolution
of the Dallas ana Denton City Councils
8 CONFIDENTIAL WORK
No reports, information, project evaluation, project designs,
5
8526(
oats or any other documentation developed by, given to, prepared by
or assembled oy INVESIIGATOR under this Contract that contains
confidential information belonging to the DALLAS or DENTON shall be
uisclosed or made available to any individual or organization by
INVESTIGATOR without the express prior written approval of the
Director
9 OWNERSHIP OF DOCUMENTS
Upon acceptance or approval by DALLAS and DENTON, all reports,
data and other documents given to, prepared or assembled under this
Contract oy INVESTIGATOR, and any other related documents or items
shall become the sole property of DALLAS and DENTON and shall be
delivered to DALLAS and DENTON Tnis section shall not be
construed, however, to prohibit INVESTIGATOR from using the
information for the purpose of composing and publishing the doctoral
dissertation of David A P111aru, F,rovided that the information is
not used tor any commercial purpose INVESTIGATOR may also make
copies of any and all documents for its files
10 CONSULTANT'S LIABILITY
Approval of DALLAS and DENTON shall not constitute or oe deemed
a release of the responsibility and liabiLity of INVESTIGATOR, its
employees and associates, for the accuracy and competency of their
studies, designs, reports, inrormation and other documents, or
services, nor shall approval be deemed to be the assumption of such
6
85260
responsibility by DALLAS or DENTON for any defect, omission, error
or omission in the documents prepared be INVESTIGATOR, its employees
or associates
11 INDEMNIrY
To the extent allowed by the law of the State of Texas,
INVESTIGATOR shall defend, indemnify, and hold DALLAS and DENTON
whole and harmless against any and all claims for damages, costs,
and expenses to persons or property that may arise out of, or be
occasioned by or from any negligent act, error or omission of
INVESTIGATOR or any agent, servant, or employee of INVESTIGATOR in
the execution or performance of this Contract
12 RIGHT OF REVIEW
DALLAS and DENION may review any and all of the services
performed by INVESTIGATOR under this contract
13 CONFLICT OF INTEREST OF CITY EMPLOYEES
Ins following section of the Cnarcer of the City of Dallas shall
!,e one the conditions of, and a part of, the consideration or this
contract, to-wit
"CHAPTER XXII SEC II FINANCIAL INTEREST OF EMPLOYEE OR
OFFICER PROHIBITED No officer or employee snall have any
financial interest, direct or indirect, in any contract with the
CITY or be financially interested, directly or indirectly, in
8526(
the sale to the CITY of any land, materials, supplies or
services, except on behalf of the CITY as an officer or
employee Any violation of this section shall constitute
malfeasance in office, and any officer or employee guilty
thereof shall thereby forfeit his office, and any officer or
employee guilty tnereof shall thereoy rorfeit his office, or
position with the CITY Any violation of this section, with
knowledge, express or implied, of the person or corporation
contracting with the CITY shall render the contract involved
voidable by the City Manager or the City Council
The allegea violations of this section shall be matters to
be determined either by the Trial Board in the case of employees
who have the right to appeal to the Trial Board, and by the city
council in the case of otnec employees "
14 NONDISCRIMINATION
As a condition of this Contract, INVESTIGATOR covenants tnat
INVESTIGATOR will take all necessary actions to insure tnat, in
connection witn any work under this Contract, INVESTIGATOR, nis
associates and subcontractors, will not aiscriminate in the
treatment or employement of any individual or groups of individuals
on the grounds of race, color, religion, national origin, age, sex,
or physical handicap unrelated to job performance, either directly,
indirectly or through contractual or other arrangements In this
regard, INVESTIGATOR shall keep, retain and safeguard all records
8
85260
relating to this Contract or work performance hereunuer for a
minimum period of three (3) years from tinal Contract completion,
with full access allowed to authorized representatives of DALLAS and
DENTON, upon request, for purposes of evaluating compliance with
this and other provisions of the Contract
15 CONTRACT PERSONAL
Tnis Contract provides for personal and professional services,
and the INVESTIGATOR shall not assign this Contract, in whole or to
part, without the prior written consent or DALLAS and DENION
16 TERMINATION
DALLAS, after consultation with DENTON, or INVESTIGATOR may
terminate this Contract upon thirty (30) days written notice to
other party with the understanding that all services oeing performed
unaer this Contract of sole cost to either shall cease upon the date
specified in such notice INVESTIGATOR shall invoice DALLAS ana
DENTON for all services completed and snail to compensatea in
accordance with the terms of this Contract for all services
performed by INVESTIGATOR prior to the date specified in such notice
17 NOTICES
All notices, communications, and reports required or permitted
under this Contract shall oe personally delivered or mailed to the
respective parties oy aepositing same in the Uniteu States mail,
9
85260
postage prepaid, at the address shown below, unless and until either
party is otherwise notified in writing by the other party, at the
following addresses Mailed notices snall be deemed communicated as
of five days after mailing
if intended for DALLAS, to Fred Stone
manager, Research & Development
1020 Sargent Road
Dallas, TX 74216
If intended for DENTON, to City Manager
City of Denton
Municipal Building
Denton, Texas 76201
if intended for INVESTIGATOR, to Dr Kenneth L Dickson
Director, Institue of Applied
Sciences
North Texas State University
NT Box 13078
Denton, Texas 76203
18 INDEPENDENT CONTRACTOR
In performing services under this Contract, INVESTIGATOR is
performing services of the type performed prior to this Contract,
and DALLAS, DENTON and INVESTIGATOR by toe execution of this
Contract do not change the independent status of INVESTIGATOR No
term or provision of this Contract or act of INVESTIGATOR in the
performance of this Contract snall be construed as making
INVESTIGATOR the agent, servant, or employee of the DALLAS or DENTON
19 VENUE
The obligations of the parties to this Contract are performable
10
8526(
in Dallas County, Texas, and if legal action is necessary to enforce
same, exclusive venue snall lie in Dallas County, Texas
20 APPLICABLE LAWS
Tnis Contract is made subject to the provisions of the Cnarter
and ordinances of DALLAS, as amended, and all applicable State and
federal laws
21 GOVERNING LAW
This contract shall be governed by and construed in accordance
with the laws and court decisions of the State of Texas
22 LEGAL CONSTRUCTION
In case any one or more of the provisions contained in this
Contract shall for any reason be held to oe invalid, illegal, or
unenforceable in any respect, sucn invalidity, illegality, or
unenforceability shall not affect any other provision thereof and
tnis Contract shall be considered as if sucn invalid, illegal, or
unenforceable provision had never been contained in tnis Contract
23 COUNTERPARPS
This Contract may be executed in any number of counterparts,
each of whicn shall be aeemed an original and constitute one and the
same instrument
11
8526(
24 CAPTIONS
The captions to the various clauses of this Contract are for
informational purposes only and shall not alter the suostance of the
terms and conditions of this Contract
25 SUCCESSORS AND ASSIGNS
This Contract shall oe binding upon and inure to the benefit of
the parties hereto and their respective heirs, executors,
aamintstrators, successors and, except as otherwise provided in this
Contract, their assigns
26 ENTIRE AGREEMENT
fnis Contract emoodies the complete agreement of the parties
nereto, superseding all oral or written previous and contemporary
agreements between the parties and relating to matters in this
Contract, and except as otherwise provided herein cannot be modified
without written agreement of the parties to be attacned to and made
a part of this Contract
EXECUTED this day of , 198 by DALLAS,
signing oy and through its City Manager, duly autorized to execute
same by Resolution No adopted Gy the City Council
on , and by DENTON, signing by and through its City
manager duly authorized to execute same by ordinance
12
8526
No q-5- / r 0 , and by INVESTIGATOR, NORTH
UNIVERSITY, through its duly authorized officials
APPROVED AS TO FORM
Analeslie Muncy, City Attorney
BY
Assistant City Attorney
auomdto0 h it Att rre
CITY OF DENTON
By
C ty Manager
APPROVED AS TO FORA
BY ~.f' /1. X~i~~l Q7. 1-ll
City Attorney
9639D
CITY OF DALLAS
CHARLES S ANDERSON
City Manager
TEXAS
STATE
BY \ 1'2~ c.--
AssissEan ity IT3nager
INVESTIGATOR
NORTH TEXAS STATE UNIVERSITY
BY
Name obert B Toulouse
Title Provost
13
85260
A Proposal For
Pre-Impoundment Estimations of Nutrient Loading to Ray Roberts
Lake and Prediction of Post-Inundation Trophic Status
by
Kenneth L Dickson
David A Pillard
Institute of Applied Sciences
and
Department of Biological Sciences
North Texas State University
P 0 Box 13078
Denton, Texas 76203
'lay, 1985
8 5 2 6 0
Pre-Impoundment Estimations of Nutrient Loading to Ray Roberts
Lake and Prediction of Post-Inundation Trophic Status
INTRODUCTION
The water supplies of the United States are under increasing
pressure As agricultural municipal, and industrial
requirements grow, water sources are being seriously depleted
This is especially true in arid regions Even in mesic areas
however, decreasing supplies associated with possible
groundwater contamination are forcing development of new sources
To compensate for this reduced supply and to meet rapidly growing
demands, surface water is often utilized as both a municipal and
industrial source
in areas which lack naturally occurring lacustrine systems
the construction of artificial reservoirs on existing rivers is
common The purpose of the reservoirs is primarily four-fold
(NCTCOG, 1981)
1) Supplying water for municipal and industrial use
2) Contact recreation
3) Noncontact recreation
4) Propagation of fish and wildlife
Reservoirs, therefore are not only designed to be a primary
water supply, but also act to generally increase the aesthetics
and suitability of an area for wildlife
1
85260
The importance of surface water to North Central Texas
cannot be overemphasized Texas population has increased
dramatically, with a 1533 growth between the years of 1900 and
1950 A population of over 4 066 000 is projected for the year
2000 in the Dallas/Fort Worth Standard Metropolitan Statistical
Area (NCTCOG, 1981)
Based on socioeconomic conditions, therefore, it would be
beneficial to have an intimate understanding of reservoir
dynamics, both biological and chemical Such knowledge would
facilitate present and future management of available resources,
which would, in turn enhance water quality and usability In
addition, such understanding is desireable under section 314-A of
the Federal Water Pollution Control Act of 1972 (Public Law
92-500) which requires states to classify water bodies according
to the degree of eutrophication (Lee et al 1978)
Although considerable research has been directed towards
analyzing the effects of potentially harmful xenobiotic
substances entering aquatic systems water quality problems
related to excessi.,e nutrient loading are also of concern while
eutrophication is a natural process it is not necessarily a
desireable one particularly in terms of municipal water use
Anthrogenic hypereutrophication often accelerates and aggravates
the problem
Often the most noticeable eutrophication-related problems are
those related to algal blooms particularly those associated with
2
aszso
cyanophytes and actinomycetes Cyanophytes produce certain
metabolic chemicals (1 a geosmin and methylisoborneol) which
can directly affect water quality by causing undesireable tastes
and odors Although various theories have been proposed to
explain blue-green blooms more recent studies have indicated
that blooms may form as a result of low N P ratios (Schindler
1977, Smith 1983) and low carbon dioxide concentrations (related
to pH) (King, 1970, Shapiro 1973 Paerl and Ustach, 1982) which
are associated with excessive nutrient loading and
stratification Taste and odor problems are often especially
serious in Texas reservoirs (DWU and UTD 1977) Both biological
and physical methods have been employed with varying degrees of
success, to eliminate taste and odor problems (Silvey and
Biefderman 1969 Symons et al 1970 Lorenzen and Mitchell
1975) Recent investigations have discovered that eutrophication
may stimulate formation of trihalomethaness (e g chloroform)
(Jones and Lee 1982, Lee and Jones 1983)
various methods have been developed for measuring the trophic
status of a waterbody Techniques have included fish yield
(Hanson and Leggett 1982) and aquatic macrophytes (Canfield et
al , 1983) However the best estimator of trophic status has
been found to be chlorophyll a (Jones and Lee 1982)
Nevertheless it is necessary to relate any trophic indicator to
nutrient loading Carlson s widely used trophic state index used
various equations to interrelate chlorophyll a to phosphorus
3
85`_'60
concentration a well as secchi depth (Carlson 1977)
Both phosphorus and nitrogen play critical roles algal growth
and, subsequently, eutrophication Phosphorus has generally been
found to be the most important nutrient in terms of trophic
status, since it is usually limiting In Texas reservoirs
nitrogen becomes limiting, for the most part, only in cases of
extreme phosphorus loading, particularly as a result of domestic
sewage (DWU and UTD 1977)
Nutrient sources can be divided into 2 large categories 1)
Point sources and 2) Nonpoint sources The most signifizant
point source for most lakes comes from wastewater treatment
effluents (Rast and Lee 1983) Nonpoint sources can be
separated into the following compartments (Uttormark 1974)
1) Groundwater
2) Surface water
a) Streamflcw
b) overland Flow
3) Precipitation
4) Dry Fallout
5) Miscellaneous
a) Waterfowl
b) N-Fixation
Nonpoint sources generally contribute only a small proportion
of the nutrients available for use by phytoplankton although
they may contribute a larger amount of the total nutrients In
4
8526(
Lake Ray Hubbard, for example, it was found that 63 6% of the
total phosphorus and 41% of the total nitrogen was contributed by
nonpoint sources (DWU and UTD, 1977) However, point sources
were responsible for as much as 753 of the dissolved inorganic
phosphorus
Atmospheric fallout may contribute notable amounts of
nutrients, primarily nitrogen During the Lake Ray Hubbard study
data indicated atmospheric (both dry and rain) inputs accounted
for only 0 74 of the total phosphorus but 18 0% of the total
nitrogen (DWU and UTD, 1977) other studies have presented
similar results (Uttormark 1974), although Murphy and Doskey
(1975) and Delumyea and Patel (1977) suggest precipitation
contributed significant amounts to the phosphorus budget of Lake
Michigan and Lake Huron, respectively However, the degree of
contribution varies considerably with the system and its
geographic location (Uttormark, 1974)
Release of nutrients from sediments may also influence the
total phosphorus budgets of lakes Bannerman at al (1975)
indicated sediments contributed about 10% of the total phosphorus
load in Lake Ontario Other researchers report even higher
phosphorus inputs by internal loading from sediments (Cooke at
al , 1977, Gunnison at al 1984) In smaller lakes however
external sources may reduce the importance of sediment
contributions Anaerobic hypolimnetic conditions may tend to
increase phosphorus release from sediments (Bannerman at al
5
852608
1975, Nurnberg, 1984) it is transport (rather than just
release) of phosphorus into the photic zone by diffusion and
turbulent mixing that will influence algal productivity
Leaching from soils and substrata may also be important in
contributing nitrogen (Austin and Lee 1973, Brezonik, 1973)
However, the release of nutrients, particularly phosphorus may
be balanced by nutrient sorption to the sediments and thus loss
from the water column (Sonzogni et al, 1976, Lee et al , 1978)
Nutrient inputs from waterfowl or nitrogen-fixation probably
play a very minor role in most lentic systems The importance of
these factors may increase however, in smaller lakes and ponds
Land utilization will often affect nonpoint nutrient runoff
Rast and Lee (1978) in examinations of several lakes worldwide
found that phosphorus runoff from urban areas was much higher
than from Rural/Agricultural or Forest areas Brezonik (1973)
integrated information from several sources and found similar
results While phosphorus was higher from urban regions
inorganic nitrogen however in runoff increased with
agricultural use particularly as a result of the application of
fertilizers (Brezonik, 1973 Uttormark et al 1974 Omernik
1978 Rast and Lee 1978)
The use of mathematical models has become very important in
assessing water quality and thus _n managing a system several
models exist utilizing various parameters and having a wide range
of complexity Generally however models may be divided into 2
6
85260
types (Bast et al , 1983)
Dynamic models are, essentially a series of interrelated
differential equations which describe the biological chemical
and physical reactions and interactions governing aquatic plant
growth (usually phytoplankton) These models encompass many
driving forces including not only nutrient loadings but light and
temperature as well Dynamic models usually require extensive
data collection and are adjusted to specific waterbodies
Statistical (empirical) models are statistical regressions
which quantify cause/effect relationships In these models an
effect (usually algal chlorophyll a) is plotted against a cause
(e g , phosphorus loading) and a line of best fit is drawn
through the various points These models require less data
collection and are usually widely applicable
Vollenweider (1968 1969 1975) settled on total phosphorus
as the best predictor of resulting planktonic algal
concentrations Original Todels normalized phosphorus by mean
depth Later models however took into account the importance
of hydraulic residence time Vollenweider (1976) developed the
following statistical correlation for phosphorus normalization
(L(P)/(z/tw))/(1 + tw)
where
L(P) = areal annual P loading
z = mean depth
tw = hydraulic residence time
7
85260
Hydraulic residence time, while appropriate for conservative
elements, may not necessarily be applicable when dealing with
nonconservative elements such as phosphorus (Sonzogni et al
1976) For these elements it is necessary to take into account
losses in the lake or reservoir through mechanisms other than
the main outlet, specifically losses to the sediments
Therefore, the basic equation
V(dc/dt) - Qci- Qc
where
V - volume of waterbody
Q = volumetric flow rate
ci = constant influx concentration
c = concentration in lake
must be modified to include internal losses
V(dc/dt) = Qci - Qc - kcV
where
k = internal rate loss constant
Relating phosphorus concentration to mean depth and phosphorus
residence time would then allow for a better prediction of algal
chlorophyll a concentration
Nevertheless hydraulic residence time is still recognized as
being critical in impoundments Dillon (1975) recognized the
importance of flushing time especially to impoundments in
series An impoundment that has been constructed upstream from
but in close proximitf of another impoundment may notably affect
8
85260
the latter This is especially true if the upstream reservoir
has a long hydraulic residence time A residence time in excess
of 2 weeks can significantly reduce the concentration of
nutrients, particularly phosphorus leaving the impoundment (Lee
et al , 1978, Lee and Jones 1983 Rast and Lee 1983)
Similarly, if a reservoir arm is very long or isolated from other
parts of the reservoir nutrients are lost to the sediments or
converted to unusable forms before reaching the main body (Lee
and Jones, 1983)
STUDY OVERVIEW
Ray Roberts Lake is presently under construction north of the
city of Denton When completed (scheduled to close in late
summer of 1986 with an approximate 6 year filling time) the
reservoir will supply water to the cities of Dallas and Denton
This study will concentrate on gathering the necessary
information from field and laboratory investigations to 1)
establish baseline llmnological data on the Ray Roberts
watershed, 2) construct a nutrient budget for Ray Roberts Lake
quantifying sources and sinks of phosphorus and nitrogen 3)
relate nutrient input to the land use of the watersheds of the
sampled tributaries and 4) construct a computer-generated
eutrophication model for the completed reservoir employing the
acquired nutrient data
9
$5260
STUDY AREA
Ray Roberts Lake
Ray Roberts Lake is presently under construction by the U S
Army Corps of Engineers It is located in the northeast corner
of Denton County, when completed it will extend into Cooke and
Grayson counties as well The Ray Roberts Dam is earthen and
located just below the confluence of the Elm Fork of the Trinity
River and Isle duBois Creek approximately 48 3 km (30 miles)
above Lewisville Lake dam at Elm Fork river kilometer 44
Estimated dimensions and capacities of the reservoir are given in
Table 1
When completed the reservoir (Fig 1) will cover an estimated
11,877 95 hectares (29,350 acres) at the conservation pool and
14 933 43 hectares (36 900 acres) at the flood control pool In
addition to the typical reservoir uses already mentioned Ray
Roberts Lake will supply hydroelectric power to the city of
Denton Water will be supplied to Dallas and Denton in a 3 1
ratio, respectively
Present Area
The two main tributaries of Ray Roberts Lake will be the Elm
Fork of the Trinity River and Isle duBois Creek (Fig 2) The
reservoir will corer the Trinity River and Isle duBois channels
for approximately 26 river kilometers several other minor
10
85260
tributaries, many of which are seasonally ephemeral will also be
inundated by the reservoir
The 2 primary tributaries represent different soil types and
characteristics To the west of the Trinity, clayey and loamy
prairie soils (Grand Prairie) predominate while sandy soils of
the savannahs (Eastern Cross Timbers) are characteristic of the
Isle duBois basin (Fitzpatrick et al , 1972)
The Ray Roberts drainage basin is at the present time,
primarily agricultural The approximate land use proportions are
(T D W R , 1983)
Dry Cropland 75%
Rangeland 20%
Forestland 3%
Urban Buildup 2%
Several sources place treated water into the 2 main streams
as well as some smaller tributaries (Fig 3 Table 2)
Municipalities place the majority of water into the systems
During low summer flows the majority of water in the Trinity can
be derived from discharged water primarily from the city of
Gainsville The Elm Fork of the Trinity is water quality limited
and is ranked 29 by the Texas Department of Water Resources
indicating reasonably high priority for water quality controls
(T D W R , 1983)
11
85260
OBJECTIVES
Stream Sampling
To quantify the nutrients which will regularly be entering
Ray Roberts Lake, tributaries will be sampled In addition to
the 2 main streams, the Elm Fork of the Trinity and isle duBois
Creek, samples will also be collected from Spring Creek and Buck
Creek
Nonpoint Nutrient Sampling
The quantification of nonpoint nutrient sources may be an
important factor in establishing a nutrient budget and
eutrophication model for the lake Nonpoint inputs may be
determined by obtaining water samples during and after rainfall
events Samples will be taken either manually or with an
automatic sampler from several tributaries
Atmospheric input (both dry fallout and precipitation) of
nutrients may be important and will be accounted for
The hypotheses (null) related to the above objectives are
1) There is no difference between measured stream (point)
nutrient inputs (phosphorus and nitrogen) and nonpoint
inputs
2) There is no difference between nutrient inputs of the major
tributaries (Elm Fork of the Trinity and Isle duBois Creek)
to Ray Roberts Lake
12
85260
Sediment/Water Nutrient Exchange
Release of nutrients from the sediments may contribute
significantly to the phosphorus and nitrogen budgets of
reservoirs This is especially important in recently inundated
areas Soil samples from the Ray Roberts basin, representing the
3 mayor soil associations, will be studied in reaction chambers
(microcosm experiment) Net change in nitrogen and phosphorus
will be monitored over an extended period of time Both aerobic
and anaerobic systems will be studied
The hypotheses (null) are
1) There is no difference in nutrient release or uptake between
soils tested in the microcosm study
2) There is no difference in nutrient release or uptake between
the oxic and anoxic experimental chambers
Land Use/Nonpoint Nutrient Relationships
Several studies indicate land use is related to the degree
and type of nonpoint inputs As forests and grasslands are
replaced by agricultural and urban areas runoff increases,
carrying both phosphorus and nitrogen The land use categories
of the Lake watershed will be determined These will be related
to nonpoint nutrients sampled during high water and runoff
events
The hypothesis (null) is
1) There is no difference between various land use categories
13
85260
(e g forest, cropland urban) in terms of nonpoint
phosphorus and nitrogen collected during runoff events
MATERIALS and METHODS
Point Nutrients
Samples will be collected at 2-week intervals for
approximately 1 year at sites on isle duBois Creek the Trinity
River, and Spring Creek Sampling will be concentrated above
what will be the main body of the reservoir, 1 e above the
present location of FM 455 (Fig 4)
Triplicate samples will be taken in acid-rinsed polyethylene
bottles In the field, dissolved oxygen, temperature
conductivity and pH will be taken using calibrated meters
Samples will be iced and returned to the laboratory Alkalinity
hardness turbidity solids (TDS and TSS) chloride sulfate
ammonia nitrate Kjeldahl nitrogen total phosphate and
orthophosphate will be determined Techniques are given in
Table 3
Nonpoint Nutrients
At least one flow-proportional sampler (Isco) will be used to
collect water samples for analysis during high-water events
This sampler will be located on the Elm Fork (above FM 455)
Other grab samples will be collected during high-water events at
various points on the hydrograph Samples will be collected from
14
85260
the main tributaries as well as the smaller ones mentioned
previously Water samples including those from the automatic
sampler, will be iced and removed to the laboratory for analysis
of the parameters already mentioned
Precipitation will be sampled with rain gauges equipped with
nylon nets to prevent the capture of insects (Dillon and Rigler
1974) These samples will be analyzed for ammonia, nitrate
K7eldahl nitrogen, total phosphate and orthophosphate
Sediment/Water Nutrient Exchange
Four representative sites will be selected within the bounds
of Ray Roberts Lake The sites will include one in the Prairie
soils along the Elm Fork (Norangee-Wilson-Crockett association),
one in the Savannah soils along Isle duBois
(Callisburg-Gasil-Aubrey association) and one in the bottomlands
near one of the main tributaries These 3 sites will be located
in the upper part of the reservoir in wooded areas A fourth
site will be chosen in bottomland soil in what will be the main
body of the reservoir
Soil samples will be collected from the upper 30 mm of
topsoil and transported back to the lab in acid-rinsed plastic
buckets On-site water samples will be collected near the
soil-sampling area Soil and water w-ll b mixed in gallon 3ars
and allowed to settle The microcosms will be allowed to run for
30 days Approximately every 5 days water will be analyzed for
15
85260
total phosphorus orthophosphorus ammonia nitrate and K)eldahl
nitrogen For anaerobic systems the water will be purged of
oxygen by bubbling with nitrogen prior to addition to soil
(Craft, 1983a, 1983b, Gunnison et al 1980 1984)
Land Use/Nonpoint Nutrient Relationships
Extensive maps and photographs of the Ray Roberts watershed
are available These include both contour maps and aerial
photographs Black and white as well as infra-red pictures are
available Using the contour maps, the watersheds for each
tributary will be determined Land use will be categorized into
forest land cropland grassland and urban areas Field
observations will note any substantial changes in land use for a
given area Total area for a particular category will be
determined from the maps using a polar planimeter Nutrient
values obtained during highwater events can then be normalized to
area within the watershed
DATA MANAGEMENT
Data will be analyzed utilizing the Statistical Analysis
System (SAS) available at North Texas State University Testable
hypotheses will be accepted or rejected at the 95% confidence
level Differences bet4een field sites and microcosm tests will
be analyzed using analysis of variance and multiple range tests
16
8 5 2 6 C
Table 1 Dimensions and capacities of Ray Roberts Lake
Lake
Flood Control Pool
Elevation
195 2
m (640 5 ft)
Surface Area
14933
4 hec (36900 acres)
Conservation Pool
Elevation
192 8
m (632 5 ft)
Surface Area
11877
9 hec (29350 acres)
Total Controlled Storage
9 87 x
108 m3 (799600 Acre-Ft)
Drainage Area
1787 1
km2 (690 m12)
Mean Depth
8 2 m
(27 ft)
Will Cover Elm Fork of the
Trinity from
River Kilometer 44
to Kilometer 70
Dam
Type Compacted Earth Dam
Length 4648 2 m (15250 ft)
Maximum Height 42 4 m (139 ft)
17
19
8526
Elm Fork of
the Trinity lR
Spring
Creek
lear Creek
Cooke Co
I
i
i i
i
i
Sanger
i
' N
Denton
D 8 miles
D 12 km
Lewisvill
Lake
Figure 2 Ray Roberts Lake site and surrounding area
20
imoer
Creek
'Isle du8ois
Creek
i _ Grayson Co
Pilot Point
Ray Roberts Lake
Site
FAubrey
8526a
Figure 3 location of mayor dischargers on the Elm Fork of the Trinity
River and Isle duBois Creek above the location of the Ray
Roberts dam
21
IIisburg
Lindsay 0
I 8910 Gainsville
Collinsville
Elm Fork of the
Trinity River 3
p7 p ❑Hunicipal Dischargers
6 p Other Dischargers
(See Table 2)
Valley View
5
Isle duBois
Creek
Cooke County
Oenton County
Dam Site
/ I
(Grayson Co
I
I
I
Ii
❑ Pilot
Point
22
8526
Table 2 List of dischargers into the Elm Fork of the Trinity River and
Isle duBois Creek (see Figure 3) (Modified from T 0 W R , 1983 )
Discharger
City of Pilot Point
City of Tioga
City of Collinsville
City of Callisburg
Valley View Plant
Texas Dept of Highways (North)
Texas Dept of Highways (South)
City of Gainsville
Atchison, Topeka and Santa Fe
Railroad
Southland Paint Company
City of Lindsay
Number/Location
1
2
3
4
5
6
7
8
9
10
11
23
8 5 2 6 1
Table 3 Parameters and methods of analysis
Parameter
Method
Dissolved Oxygen
Meter
Temperature
Meter
Conductivity
Meter
PH
Meter
Alkalinity
Titration*
Hardness
Titration*
Turbidity
Meter
Chloride
Meter
Ammonia
Meter
Nitrate
deter
Organic Nitrogen
Kjeldahl*
Total Phosphate
Persul fate Digestion/Ascorbic Acid*
Orthophosphate
Ascorbic Acid*
Solids (TDS and TSS)
Filtration/Drying*
Sulfate
7urbidimetrtc*
*APHA (1980)
24
8.5250
rn
C Y
v
L N
a s.
vi u
N
d L
E
25
85260
LITERATURE CITED
APHA 1980 Standard methods for the examination of water and
wastewater 15th edition American Public Health
Association Washington D C 874 p
Bannerman, R T, D E Armstrong R F Harris and G C Holden
1975 Phosphorus uptake and release by lake Ontario
sediments EPA-660/3-75-006 National Environm Res
Center, Corvallis U S EPA 51 p
Brezonik, P 1973 Nitrogen sources and cycling in natural
waters EPA-660/3-73-002 U S EPA, Washington, D C 167
p
Canfield, D E Jr , K A Langeland, M J Maceana, W T Haller
J v Shireman, and J R Jones 1983 Trophlc state
classification of lakes and aquatic macrophytes Can J
Fish Aquat Sci 40 1713-1718
Carlson R E 1977 A trophiC state index for lakes Limnol
O::eanogr 22 361-369
Cooke G D M R McComas D W Waller and R H Kennedy 1977
The occurrence of internal phosphorus loading in two small
eutrophic, glacial lakes in North-eastern Ohio
Hydrobiologia 56 129-135
Craft, D 1983a Microsystem sediment-water simulation a
practical technique for predicting resevoir water quality
REC-ERC-83-12 U S Dept of the Interior Bureau of
Reclamation 7 p
26
8526(
Craft, D 1983b A microsystem sediment-water simulation study
for the proposed Jordanelle Reservoir, Heber City, Utah
REC-ERC-83-13 U S Dept of the Interior Bureau of
Reclamation 21 p
Delumyea, R G and R L Petel 1977 Atmospheric inputs of
phosphorus to Southern Lake Huron April-October 1975
EPA-600/3-77-038 Environ Res Lab Duluth 53 p
Dillon, P 1975 The phosphorus budget of Cameron Lake,
Ontario the importance of flushing rate to the degree of
eutrophy of lakes Limnol Oceanogr 20 28-39
Dillon, P and F Rigler 1974 A test of a simple nutrient
budget model predicting the phosphorus concentration in lake
water Jour Fish Res Bd Can 31 1771-1778
D W U and U T D 1977 Lake Ray Hubbard Eutrophication Study
An assessment of the impact of point and nonpoint sources on
water quality in Lake Ray Hubbard Vol I Dallas Water
Utilities and the Univ of Texas at Dallas North Central
Texas Council of Governments xvii + 305 p
Fitzpatrick L C R L Absire L G Knox R A Miller E D
Odom W D Pearson A W Roach K W Stewart E G
Zimmerman and J K G Silvey 1972 A systems evaluation
of the environmental impact of the Aubrey Reservoir project
on the Elm Fork of the Trinity River in North Texas Report
to the U S Army Corps of Engineers
Gunnison, D J M Brannon R L Chen I Smith and T C Sturgis
27
8526(
1984 Richard B Russell Dam and Resevoar potential water
quality effects of initial filling and decomposition of
vegetation U S Army Corps of Engs 51 p
Gunnison, D, J M Brannon, I Smith, G A Burton, and K M
Preston 1980 A reaction chamber for study of
interactions between sediments and water under conditions of
static and continuous flow Water Res 14 1529-1532
Hanson J M and W C Leggett 1982 Empirical prediction of
fish biomass and yield Can J Fish Aquat Sci
39 257-263
Jones, R A and G F Lee 1982 Recent advances in assessing
the impact of phosphorus in eutrophication-related water
quality J Wat Res 16 503-515
King D L 1970 The role of carbon in eutrophication Jour
Wat Pollut Control Fed 42 2035-2051
Lee, G F and R A Jones 1983 Prediction of water quality in
proposed hydropower ispoundments Waterpower 1983
Conference Proceedings 20 p
Lee G F W Rast and R A Jones 1978 Eutrophication of
water bodies Insights for an age-old problem Environ
Sci and Tech 12 900-908
Lorenzen M W and R Mitchell 1975 An evaluation of
artificial destratification for control of algal bloom J
Amer Wat Works Assoc 67 373-376
NCTCOG 1981 Annual water quality ranagement plan for North
28
V5V6(
Central Texas North Central Texas Council of Governments
Nurnberg, G K 1984 The prediction of internal phosphorus load
in lakes with anoxia hypolimnia Limnol Oceanogr
29 111-125
Murphy T J annd P V Doskey 1975 Inputs of phosphorus from
precipitation to Lake Michigan Us EPA Report
EPA-600/3-75-005 24 p
Omernik, J 1976 The influence of land use on stream nutrient
levels EPA-600/3-76-014 Office Res and Dev U S
Environ Prot, Agency Washington D C
Paerl, H W and J F Ustach 1982 Blue-green algal scums An
explanation for their occurrence during freshwater blooms
Limnol Oceanogr 27 212-217
Rast, W R A Jones, and G F Lee 1983 Predictive capability
of U S OECD phosphorus loading-eutrophication response
models Jour Water Pollut Control Fed 55 990-1003
Rast, W and G F Lee 1978 Summary analysis of the North
American (US portion) OECD eutrophicati.on project nutrient
loading lake-response relationships and trophic state
indices Corvallis Env.iron Res Lab U S EPA xxi + 453
p
Rast, W and G F Lee 1983 Nutrient loading estimates for
lakes Jour Environm Engineer 109 502-517
Schindler D W 1977 Evolution of phosphorus limitation in
lakes Science 195 260-267
29
8526
Shapiro, J 1973 Blue-green algae why they become dominant
Science 179 382-384
Silvey, J K G and W J Biefderman 1969 Tastes and odors pp
74-136 in manual of water Utilities Operations, 17th ad
Texas Water Utilities Assoc
Smith, V H 1983 Low nitrogen to phosphorus ratios favor
dominance of blue-green algae in lake phytoplankton
Science 221 669-678
Sonzogni, W C P G Uttormark and G F Lee 1976 A
phosphorus residence time model theory and applicytion
Water Res 10 429-435
Symmons, J J, J K Carswell and G G Roebuck 1970 Mixing
for quality control J Amer Wat Works Assoc
62 322-337
T D W R 1983 Waste load evaluation for segment 0824 of the
Trinity River Basin (Elm Fork Trinity River) Texas Dept
Wat Res x + 101 p
US Army Corps of Engineers 1983 Environmental Impact
Assessment Greenbelt corridor between Ray Roberts dam and
Lewisville Lake Fort Worth District 16 p
Uttormark P D J D Chapin and K M Green 1974 Estimating
nutrient loadings of lazes from non-point sources
EPA-660/3-74-020 Prepared for the off Res Monitor US
Environ Protect Agency Washington D C 112 p
Vollenweider, R 1968 The scientific basis of lake and stream
30
89" 261
eutrophication, with particular reference to phosphorus and
nitrogen as eutrophication factors Tech Report OECD,
Paris, DAS/DSI/68 27 1
Vollenweider, R A 1969 Possibilities and limits of
elementary models concerning budgets of substances in lakes
Arch Hydrobiol 66 36
Vollenweider, R A 1975 Input-output models, with special
reference to the phosphorus loading concept in limnology
Schweiz Z Hydrol 37 53-84
Vollenweider, R A 1976 Advances in defining critical loading
levels for phosphorus in lake eutrophication Mem Ist
ital Idrobio 33 53-83
31
Budget - Ray Roberts Lake Project EXHIBIT B
June 15, 1985 through January 15, 1987
Dallas NTSU
Utilities Match
es
Salaries 5 No
Dickson, 4noeth L.
1.5 manlmonths, Summer
1.5 man months, Summer
Pillard, Divid, Graduate
18 months @ $750/month
Work-StudylStudent Help
Fringe Benefits
1985 6,413
1986 6,734
tesearch Assistant
13$00
1,000 ,
Total Salaries and Wages 27,647
22.5% of Sqlaries (130147) 2,958
14% of Wag@s (14,500) 2,030
Insurance, 3 man months @ $90/month 270
Total Fringe Benefits 5,258
Maintenance & Operation
Materials & supplies for chemical analysis 750
Upkeep on flow proportional systems, mic%. supplies 1.5400
00
Presentation/Publications
Total Maintenance & Operation 29650
Equipment
Three (3) Model 2700 ISCO Flow Proportional Samplers with 15,600
flow meters and accessories @ $5200/each
Travel
1200 miles @ .25/mile 500
TOTAL DIRECT COSTS 51,655
Indirect Qo9tA
Overhead @ 10% TDC 5,166
NTSU approved rate of 48.9% S&W less 10% TDC 8,353
paid by agency
r.
TOTAL PROJECT COST 560821 8,353
Y